194 results found
Eastwood D, Coren DD, Long CA, et al., 2012, EXPERIMENTAL INVESTIGATION OF TURBINE STATOR WELL RIM SEAL, RE-INGESTION AND INTERSTAGE SEAL FLOWS USING GAS CONCENTRATION TECHNIQUES AND DISPLACEMENT MEASUREMENTS, ASME Turbo Expo 2011, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 859-870
Heyes AL, Botsis L, McGlashan NR, et al., 2012, A THERMODYNAMIC ANALYSIS OF CHEMICAL LOOPING COMBUSTION, ASME Turbo Expo 2011, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 105-111
Howey DA, Childs PRN, Holmes AS, 2012, Air-Gap Convection in Rotating Electrical Machines, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, Vol: 59, Pages: 1367-1375, ISSN: 0278-0046
Leon N, Childs P, Runcie C, 2012, Design led innovation, Proceedings of the 14th International Conference on Engineering and Product Design Education: Design Education for Future Wellbeing, EPDE 2012, Pages: 690-698
For the last three years a course has been offered to MEng students in their third or fourth year of studies called Design Led Innovation and New Venture Creation. The rationale for offering the course was a combination of demand for design orientated options as well as the desire to deepen students' understanding and experience of the process of realising their ideas and ventures commercially. The premise for the course is that successful design-led innovation depends on blending customer insight and technical inventiveness to create value for customers and users as well as commercial value for innovative firms and their investors. Students are coached intensively in interdisciplinary teams by design experts, engineers and entrepreneurs to develop a project into a business proposition. Theproject ideas are formed in response to the positing of a meta-theme. Students are exposed to keyconcepts in design, creativity tools and the disciplines of human-centred design as well as strategies for introducing new products or services to a market and developing the necessary value networks. A key outcome of the course has been the emphasis necessary for ensuring that the process of preparing a new venture is considered and acted upon. This has been realised by means of intensive tutoring by experienced and practicing entrepreneurs. This paper reports the student experience along with the series of interventions that have been necessary in order to develop behaviours compatible with turning technical inventiveness into potentially viable innovation propositions.
Lin L, Ren J, Jiang H, et al., 2012, HEAT TRANSFER CHARACTERISTICS OF A ROTOR-STATOR SYSTEM WITH SMALL RADIAL OUTFLOW, PROCEEDINGS OF THE ASME TURBO EXPO 2012, VOL 4, PTS A AND B, Pages: 2283-+
McGlashan NR, Childs PRN, Heyes AL, 2012, A Pb/Zn BASED CHEMICAL LOOPING SYSTEM FOR HYDROGEN AND POWER PRODUCTION WITH CARBON CAPTURE, ASME Turbo Expo 2011, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 283-291
Various, 2012, Enabled: The Rio Tinto Sports Innovation Challenge Story, Publisher: DEG Imperial College London, ISBN: 978-0-9572298-0-8
Design can have an influence far beyond the initial activity on a product, processor system. Design represents a dynamic entity as a result of the interactions withthe user and the context. Once released, a design can be adopted for uses, notinitially considered, sometimes with unintended consequences. The world of designis used to the reach of the domain, and it is within this context that the RioTinto Sports Innovation Challenge was initiated.The intention was to explore Paralympic sports, to see what design could offer.A wide open brief was developed and we pressed go. This book presents thecontributions of the many participants, students, elite sportsmen and women,domain experts and course staff.
Aurisicchio M, Eng NL, Nicolas JCO, et al., 2011, ON THE FUNCTIONS OF PRODUCTS, 18th International Conference on Engineering Design (ICED), Publisher: DESIGN SOC, Pages: 443-455, ISSN: 2220-4334
Brezing A, Childs P, Yim H, et al., 2011, Approaches to a cross-cultural engineering design theory, DS 69: Proceedings of E and PDE 2011, the 13th International Conference on Engineering and Product Design Education, Pages: 487-492
Engineering Design Theory as an integral part of design education serves the purpose of structuring actions and thinking processes in order to increase the efficiency of development processes and the quality of developed products. In many institutions in Europe and the U.S.A., problem-oriented process models based on the approach of functional decomposition have complemented teaching approaches that rely on studying standard solutions such as machine elements. If one assumes that these models have been designed to suit the thought habits and educational traditions in the cultural spheres of their origin, their validity in the context of the globalization of engineering education must be discussed. Especially with regards to "Western" and "Asian" cultures, Nisbett  substantiates the existence of profound cognitive differences that might be relevant for design education and practice. Summarizing some of Nisbett's assertions, Westerners are more likely to rely on categorizing and individualizing objects and applying formal logic in any situation, whereas Asians prefer not to disentangle objects from their context in favour of a more holistic view of the world. This paper explores the consequences of such cultural differences in the context of product design and development to add plausibility to the authors' own observations from teaching practice with students from China, Germany, South Korea, Thailand and the United Kingdom. The discussion focuses on the applicability of the established model of the Engineering Design Process, narrowing the scope of Design Theory but broadening on the view that different design practices are attributed solely to differences in social interactions.
Childs P, Fountain R, 2011, Commercivity, DS 69: Proceedings of E and PDE 2011, the 13th International Conference on Engineering and Product Design Education, Pages: 3-8
Creativity can be defined as the ability to imagine or invent something new of value. In the engineering domain, for example, in common with many workplace and social experiences, creativity is both sought after and resisted. In essence creativity represents a significant risk and yet in the fast moving business climate no creativity is even riskier. Essential to realising financial or societal value from an idea, is definition and embodiment of the details that enable the idea to be realised in practice. This paper explores the tensions involved with creativity, the value and use of creativity tools and the importance of design in realising commercial potential. This can be embodied in the moniker commercivity, the commercial exploitation of creativity through the implementation of game-changing and sustainable ideas. This paper accompanies the conference keynote. The subject matter builds on a set of ideas developed in collaboration between Rod Fountain, a serial entrepreneur and Peter Childs. The interviews were conducted for a forthcoming book on commerce and creativity. Commercivity is a registered trademark.
Childs PRN, Robb D, 2011, Design, Make, Test, 12th International Conference on Engineering and Product Design Education, Publisher: The Design Society, Pages: 174-179
McGlashan NR, Childs PRN, Heyes AL, 2011, Chemical Looping Combustion Using the Direct Combustion of Liquid Metal in a Gas Turbine Based Cycle, JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, Vol: 133, ISSN: 0742-4795
Childs PRN, 2010, People Metrics, Assessing creativity in design: emerging themes for engineering, Editors: Ball, Publisher: Higher Education Academy Engineering Subject Centre, ISBN: 9781904804833
Childs PRN, 2010, Ethics, Assessing creativity in design: emerging themes for engineering, Editors: Ball, ISBN: 978-1-904804-83-3
Childs PRN, 2010, Rotating Flow, Publisher: Butterworth-Heinemann, ISBN: 9780123820983
Swirling, whirling and rotating flow has proved fascinating and challenging throughout the ages with examples including the vortex formed as water exits the bath-tub or the swirling motion seen in a corn field as the wind blows across it the vortices shed from wing tips and the intense vortices and circulations observed in the atmosphere and oceans. The subject provides a talking point and a level of complexity that often defies simple explanation. Rotating flow is critically important across a wide range of scientific, engineering and product applications, providing design and modelling capability for diverse products such as jet engines, pumps and vacuum cleaners as well as geophysical flows. This book introduces and develops the subject of rotating flow with specific subjects including:• an introduction to rotating flow; • fundamental equations,• vorticity and vortices;• rotating disc flow;• flow around rotating cylinders and in a rotating annulus• flow in rotating cavities;• atmospheric and oceanic circulations.
Childs PRN, McGLASHAN NR, Gosling G, et al., 2010, Linking design, analysis, manufacture and test in the engineering student experience, Pages: 210-215
The modern engineer needs to have diverse skills ranging from abilities in re-design, co-design, customisation, management of resources and intellectual property, combined with technical expertise. Design education needs to prepare individuals for these requirements and manage the expectations of the students concerned. A particular challenge is the disconnect between empowered design practice, where the practitioner already has the necessary skills to explore the task, and the novice who is still learning technical and design skills. In order to develop understanding of design processes commonly experienced in industry a combination of projects using fuzzy or constrained briefs are introduced in the first and second years on the MEng in Mechanical Engineering at Imperial College. Constrained briefs defining the limits for the design activity, are sometimes criticised as limiting the creative opportunities for the people involved. Some creative techniques however focus on identifying the constraints and conflicts involved with a view to resolving them. This paper explores a constrained brief project, used for the second year, where students are required to design, manufacture and then test their design for a pump. The project encourages use and exploration of analytical skills, engineering science and form development as well as basic manufacturing skills. Students can use CNC manufacture for their impeller and volute but are required to manually machine the majority of their bearing housing and shaft arrangement. The combination of concept development within constraints, use of analysis and engineering science, development of manufacturing and assembly skills and the student experience derived from testing their designs, are described within this paper.
Childs PRN, McGlashan NR, Heyes AL, 2010, Power generation with fluid phase chemical looping combustion ETN 2010-068, 5th International Gas Turbine Conference
A new type of power cycle for large scale generation has been developed based on chemical looping that has theoretically been shown to offer practical thermal efficiencies of between 72% and 82%. Instead of performing hydrocarbon combustion in a single reaction, as in conventional power plant, the hydrocarbon is oxidised using two reactions. An additional species is required, typically a metal, which re-circulates between the two reactions carrying oxygen atoms. The chemical looping technology concerned uses processes comparable to those in the human body for extraction of energy from food but instead of using haemoglobin, metal vapour is used as the carrier for the oxidation and reduction processes. The cycle avoids the large entropy changes associated with Carnot-cycle based engines and high thermal efficiencies are possible with inherent carbon capture for power generation plants. The technology represents a step change in power generation although a series of technical barriers remain for its implementation including equation of state data, detailed chemical kinetics, development of practicable schemes to duct the highly reactive fluid flows and determination of slag melt thermodynamics. This paper explores the cycle development and technology requirements as well as addressing the need to consider cycle variants in power generation.
Childs PRN, McGlashan NR, Heyes AL, 2010, Accessing high thermal efficiency power generation using fluid phase chemical looping. 2010-ISJPPE-0001, 3rd International Symposium on Jet Propulsion and Power Engineering
In order to burn a hydrocarbon fuel efficiently using conventional cycles, very high temperatures are required. Chemical looping combustion offers an alternative cycle for large scale power production. In chemical looping combustion a carrier molecule is used to transport oxygen between two redox reactions, one where the carrier is oxidised and another where it is reduced by reaction with a fuel. Separation of the oxygen carrier from fuel ash can be aided by means of phase difference and this is a key advantage of fluid phase chemical looping combustion where the carrier medium proposed is sodium, potassium or zinc. The principle exploited in fluid phase chemical looping combustion is the recirculation of both energy and entropy. High thermal efficiencies, circa 75% at 35 bar are theoretically achievable taking into account component efficiencies, with separation of nitrogen and carbon dioxide, in combination with the water shift gas reaction, as an inherent part of the cycle if air is used as the oxygen source.
Childs PRN, Robb DA, 2010, Design, make, test, Pages: 174-179
In the UK in the 1970s and early 1980s examples of best practice pedagogic experience included the egg-race type of design and make projects embodied in the student projects run by Ken Wallace at the University of Cambridge and Heinz Wolff at Brunel University. These experiences were widely acclaimed in the media and inspired a generation of students. The technically demanding and interdisciplinary nature of such projects has, in some cases, pushed them towards the domain of mechatronics degrees. A further challenge to this form of project is the high resource requirements from staff, to hardware and space. In order to provide a stepping stone between the introductory projects such as bridge or crane building using balsa wood, a group exercise has been introduced that is inspired by the egg-race type leading edge pedagogic practice activities. A project has been developed where students are challenged to build a small hovercraft. Fans and motors are supplied but the students are required to design and build their own hulls. The activity is associated with lectures in sketching, machine elements and fluid mechanics and the fans have been sized requiring careful consideration of the air gap, hull area and mass in order to ensure that the design is compatible with the flow capacity. A further constraint is that the craft must be autonomous and navigate a specified route, with various obstacles. This paper describes the project developed for 160 Year 1 MEng students along with resource requirements and options for scaling and development.
Childs PRN, Tsai SK, 2010, Creativity in the design process in the turbomachinery industry, J. of Design Research, Vol: 8, Pages: 145-145, ISSN: 1748-3050
Coren DD, Atkins NR, Turner JR, et al., 2010, AN ADVANCED MULTI-CONFIGURATION STATOR WELL COOLING TEST FACILITY, ASME Turbo Expo 2010, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 1259-1270
Hall A, Childs PRN, 2010, Innovation design engineering: non-linear progressive education for diverse intakes, 11th Engineering and Product Design Education Conference, Publisher: The Design Society, Pages: 312-317
McGlashan NR, Childs PRN, Heyes AL, 2010, CHEMICAL LOOPING COMBUSTION USING THE DIRECT COMBUSTION OF LIQUID METAL IN A GAS TURBINE BASED CYCLE, PROCEEDINGS OF THE ASME TURBO EXPO 2010, VOL 3, Pages: 853-865
McGlashan NR, Childs PRN, Heyes AL, 2010, Chemical looping combustion using the direct combustion of liquid metal in a gas turbine based cycle. GT2010-23393, ASME Turbo Expo 2010
A combined cycle gas turbine generating power and hydrogen is proposed and evaluated. The cycle embodies chemical looping combustion (CLC) and uses a Na based oxygen carrier. In operation, a stoichiometric excess of liquid Na is injected directly into the combustion chamber of a gas turbine cycle, where it is burnt in compressed O2 produced in an external air separation unit (ASU). The resulting combustion chamber exit stream consists of hot Na vapour, and this is expanded in a turbine. Liquid Na2O oxide is also generated in the combustion process, but this can be separated, readily, from the Na vapour and collects in a pool at the bottom of the reactor.To regenerate liquid Na from Na2O, and hence complete the chemical loop, a reduction reactor (the reducer) is fed with three streams: the hot Na2O from the oxidiser; the Na vapour (plus some entrained wetness) exiting a Na-turbine; and a stream of solid fuel, which is assumed to be pure carbon for simplicity. The sensible heat content of the liquid Na2O and latent and sensible heat of the Na vapour provide the heat necessary to drive the endothermic reduction reaction and ensure the reducer is externally adiabatic. The exit gas from the reducer consists of almost pure CO which can be used to generate by-product H2 using the water-gas shift reaction.A mass and energy balance of the system is conducted assuming reactions reach equilibrium. The analysis allows for losses associated with turbomachinery; heat exchangers are assumed to operate with a finite approach temperature; however, pressure losses in equipment and pipework are assumed negligible - a reasonable assumption for this type of analysis that will still yield meaningful data. The analysis confirms that the combustion chamber exit temperature is limited by both first and second law considerations to a value suitable for a practical gas turbine. The analysis also shows that the overall efficiency of the cycle, under optimum conditions and taking into account t
McGlashan NR, Childs PRN, Heyes AL, et al., 2010, Producing Hydrogen and Power Using Chemical Looping Combustion and Water-Gas Shift, JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, Vol: 132, ISSN: 0742-4795
Regan N, Peng Z, Atkins NR, et al., 2010, An investigation to oil spray characteristics under cross flow environment of internal air system. 2010-ISJPPE-3016, 3rd International Symposium on Jet Propulsion and Power Engineering
For investigating the oil spray characteristics in internal air systems of gas turbine engines, a test rig has been built for simulating the oil leaking jet flow when a fracture takes place on those high flowrate oil supply pipes. With the air flow velocity of cross flow up to 200 m/s, oil sprays with the injection pressure up to 7 bar were provided by an purpose-built injection system. Various injector orifices with different shapes and dimensions were prepared for considering different fracture situation though only one circular nozzle was examined in the current study. While Laser Imaging was used for examining the jet behaviour and flow field with interaction between the oil spray and the cross flow, Phase Doppler Anemometry (PDA) was employed for measuring the size and velocity distributions of oil droplets. Measurements through different planes of the spray were conducted for exploring the droplet break-up and oil-air mixing process. Results showed that the high velocity of cross flow made significant enhancement for both the jet break-up and droplet break-up, in particular those droplets with bigger size, while the momentum flux ratio has very unapparent influence on variation of droplet size distributions. With the penetration of the oil spray, velocity differences between the cross flow and droplets gradually become smaller and this tends to reduce the further droplet break-up at the downstream area. Meanwhile, relevant data also demonstrated that the evaporation of different size droplets was accelerated with high velocity cross flows.
Robb DA, Flora H, Childs PRN, 2010, Sketching to solid modelling skills for mechanical engineers, 11th International Conference on Engineering and Product Design Education, Publisher: The Design Society, Pages: 275-280
Scott RM, Childs PRN, Hills NJ, et al., 2010, Radial inflow into the downstream cavity of a compressor stator well. 2000-GT-0507, ASME Turbo Expo 2000, Publisher: ASME
The subject of the interaction between the mainstreamannulus flow and seal flows is now receiving increased attentionas a result of concerted attempts to further improve compressorperformance. In an axial compressor the use of a shroud on astator blade row necessitates a trench and results in two suchregions of interaction at the upstream and downstream statorwell cavities with flow limited by a labyrinth seal. Theupstream stator well cavity, with its superposed radial outflow,has received some attention and possess similarities with thecavity downstream of nozzle guide vanes in axial turbines,which have received considerable interest. The downstreamcompressor stator well cavity has, however, been lessextensively studied. Here the flow is dominated by inflow intothe cavity. This inflow is driven by the pressure gradient acrossthe blade row and hence the pressure gradient between theupstream and downstream cavities. This paper presentspreliminary pressure measurements from a high-speed twostageresearch compressor. The experimental results arecompared with two and three-dimensional CFD models. Inorder to gain confidence with CFD for compressor stator wells,the case of inflow into a rotor-stator disc wheelspace has beenrevisited; validating a commercial code, Fluent, for a widerange of flow conditions. This code has then been used topredict the detailed flow structure for the conditions in theexperimental research compressor.
Yang B, Xu G, Childs P, et al., 2010, Prediction of coolant deflection tendencies in rotating film cooling, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE, Vol: 224, Pages: 2435-2448, ISSN: 0954-4062
Adams DJ, Beniston LJ, Childs PRN, 2009, Promoting creativity and innovation in biotechnology, TRENDS IN BIOTECHNOLOGY, Vol: 27, Pages: 445-447, ISSN: 0167-7799
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