Imperial College London

ProfessorPeterChilds

Faculty of EngineeringDyson School of Design Engineering

Head of the School of Design Engineering
 
 
 
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Contact

 

+44 (0)20 7594 7049p.childs Website CV

 
 
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Location

 

Studio 1, Dyson BuildingDyson BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

200 results found

Childs PRN, Downie JH, Katz T, 2002, Design Models and Their Value in Education, Sharing Experience in Engineering Design (SEED) 2001, Pages: 179-186

CONFERENCE PAPER

Ozturk HK, Turner AB, Childs PRN, 2002, The effect of labyrinth seal clearance on stator-well flow and windage heating, INTERNATIONAL JOURNAL OF TURBO & JET-ENGINES, Vol: 19, Pages: 219-231, ISSN: 0334-0082

JOURNAL ARTICLE

Smout PD, Chew JW, Childs PRN, 2002, ICAS-GT: A European collaborative research programme on internal cooling air systems for gas turbines, Pages: 907-914

The Internal Cooling Air Systems for Gas Turbines (ICAS-GT) research programme, sponsored by the European Commission, ran from January 1998 to December 2000, and was undertaken by a consortium of ten gas turbine manufacturing companies and four universities. Research was concentrated in five discrete but related areas of the air system including turbine rim seals, rotating cavity flow and heat transfer, and turbine pre-swirl system effectiveness. In each case, experiments were conducted to extend the database of pressure, temperature, flow and heat transfer measurements to engine representative non-dimensional conditions. The data was used to develop correlations, and to validate CFD and FE calculation methods, for internal fluid flow and heat transfer. This paper summarises the outcome of the project by presenting a sample of experimental results from each technical work package. Examples of the associated CFD calculations are included to illustrate the progress made in developing validated tools for predicting rotating cavity flow and heat transfer over an engine representative range of flow conditions.

CONFERENCE PAPER

Stobart RK, Childs PRN, 2002, Total Vehicle Technology: How do we get the innovation back into vehicle design, Publisher: Professional Engineering Publishing Limited, ISBN: 9781860583773

Early developments of passenger cars were fresh and radical and the popular imagination was firmly captured. The novelty of the early Ford Model T cars gave way to a low priced commodity version that, while cost effective, quickly lost popularity. It was the innovation promoted by Alfred Sloan of General Motors that forced Henry Ford to develop the Model A. Since then car manufacturers have frequently rung the changes to keep the buying public interested.Nearly a century after cars were first sold, their design has settled into a predictable form. Through this period the engineering progress has been staggering: passenger safety, exhaust emissions, passenger comfort, and driveability have all improved beyond recognition. Radical changes however are all too rare. The emergence of the MPV concept has made a big difference to family driving, and the arrival of the Fiat Multipla illustrates how far the concept can go in terms of spacious transport. The Smart car is a convenient town car of high utility and with its boosted downsized mid positioned engine represents a radical departure. We have seen radical progress with electronics and safety technologies.So where else have we been able to see innovation? There are big heavy vehicles, the retro look and “crossover” designs that give the impression of a desperate attempt to retain a fading market. Beneath the surface of the car innovation can be seen, but is by no means radical. Why does the truly radical so rarely emerge when we know it is possible? What is the key to releasing innovation at a faster rate?Much can be explained by history and the industry structure that has developed as a consequence. Where technology advance comes primarily through the convergence of several technologies an industry structure that keeps technologies separate is starting from a disadvantaged position. However there are hopeful signs where major (Tier 1) suppliers are looking to do more of their own innovation. In partnership

BOOK

Childs PRN, 2001, Practical Temperature Measurement, Publisher: Elsevier, ISBN: 9780750650809

BOOK

Childs PRN, Downie J, Katz T, 2001, Design models and their value in education, 23rd SEED Annual Design Conference and 8th National Conference on Product Design Education, Pages: 179-186

There are a number of models of the design process that are in relatively common use ineducation. Within industry the use of a unified design model seldom occurs and most companiesand individual designers tend to develop their own although these often have common themes.The design educator faces the challenge of assisting students to develop their design skills andyet be employable within a range of industries. Methods used to achieve this aim often includethe presentation of the more common design models. However when models are presented at theearly stages of their education students have not usually yet attained the interdisciplinary skillsdemanded by the design process. This paper reviews the approaches adopted at two universitiesto address the issues of the complexities of design models in education and suggests someapproaches to teaching design methodology, which are perceived by the students to be helpfuland not simply yet other design constraints.

CONFERENCE PAPER

Childs PRN, Stobart RK, 2001, Total Vehicle Technology: Challenging Current Thinking, Publisher: Professional Engineering Publishing, ISBN: 978-1-86058-324-7

BOOK

Childs PRN, Stobart RK, 2001, Total Vehicle Technology: Challenging Current Thinking, Publisher: Professional Engineering Publishing, ISBN: 978-1-86058-324-7

In order to provide appropriate products for the market place any industry must innovate and improve. These requirements are acute in the automotive industry and the Total Vehicle Technology conference, 2001, provides an important contribution with the focus on the totality of vehicle technologies.The aim of this conference is to provide an opportunity for the presentation and discussion of the engineering and design tasks involved in the production of a vehicle. The underlying theme of the conference is the integration of technologies in vehicle and automotive engineering. The subtitle, challenging current thinking, stems from the thrust and diversity of the papers presented, combined with the realisation amongst some major players and commentators that current engineering, design and business strategies are inadequate within the projected automotive industry environment.The theme of the conference has resulted in the collection of articles presented here. Some striking themes have emerged:• Fast and furious introduction of new technology across the spectrum of vehicle engineering;• Challengers to the current perceived future direction for prime mover technology;• The criticality of customer perception and the reordering of the importance of design criteria;• The impact of advanced design tools has resulted in a redefinition of design standards;• The requirement for a transformation in the skills base for automotive designers.The proceedings presented here represents a diverse collection of approaches to the challenges facing product developers and will make an important contribution to the automotive sector.

BOOK

Milburn C, Childs PRN, 2001, The Styling Process, Bury St Edmunds and London, Total Vehicle Technology Conference 2001, Publisher: Professional Engineering Publishing, Pages: 275-287

The automotive sector is a mature market with the consumer having increasingly more choice and as a result a greater influence on the design of new products. This paper outlines the complexity of the design process, the importance of image and branding and suggests, using an example, a possible way forward to meet the needs of the sophisticated consumer. In particular the trend for consolidation in the automotive sector is challenged as an avenue for success in favour of a leaner design process to meet the timescales of consumer interest.

CONFERENCE PAPER

Simons RW, Childs PRN, 2001, Estimating in Engineering Design, Sharing Experience in Engineering Design (SEED) 2000

CONFERENCE PAPER

Childs PRN, Brodhurst EK, 2000, Integrating Design Education Beyond 2000, Publisher: Professional Engineering Publishing, ISBN: 9781860582653

BOOK

Childs PRN, Greenwood JR, Long CA, 2000, Review of temperature measurement, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 71, Pages: 2959-2978, ISSN: 0034-6748

JOURNAL ARTICLE

Childs PRN, Simons RW, 2000, Small priced tools and equipment case study, Sharing Experience in Engineering Design (SEED) 1999

CONFERENCE PAPER

Ozturk HK, Turner AB, Childs PRN, Bayley FJet al., 2000, Stator well flows in axial compressors, INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, Vol: 21, Pages: 710-716, ISSN: 0142-727X

JOURNAL ARTICLE

Simons RW, Childs PRN, 2000, Estimating in engineering design, 22nd Sharing Experience in Engineering Design Conference/7th National Conference on Product Design Education, Publisher: PROFESSIONAL ENGINEERING PUBLISHING LTD, Pages: 261-266

CONFERENCE PAPER

Turner AB, Davies SJ, Childs PRN, Harvey CG, Millward JAet al., 2000, Development of a novel gas turbine driven centrifugal compressor, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY, Vol: 214, Pages: 423-437, ISSN: 0957-6509

JOURNAL ARTICLE

Childs PRN, Greenwood JR, Long CA, 1999, Heat flux measurement techniques, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE, Vol: 213, Pages: 655-677, ISSN: 0954-4062

JOURNAL ARTICLE

Childs PRN, Nilsson K, 1999, Flow phenomena and functionality of the infant Flow system, 5th Annual Reason Conference

CONFERENCE PAPER

Childs PRN, Noronha MB, 1999, 1997 John P. Davis Award - The impact of machining techniques on centrifugal compressor impeller performance, JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME, Vol: 121, Pages: 637-643, ISSN: 0889-504X

JOURNAL ARTICLE

Childs PRN, Simons RW, 1999, Small priced tools and equipment case study, 21st Annual Conference on Engineering Design Education/6th National Conference on Product Design Education, Publisher: PROFESSIONAL ENGINEERING PUBLISHING LTD, Pages: 275-278

CONFERENCE PAPER

Greenwood JR, Childs PRN, Chaloner P, 1999, Gold leads to PRTs for monitoring high temperatures, GOLD BULLETIN, Vol: 32, Pages: 85-+, ISSN: 0017-1557

JOURNAL ARTICLE

Jackson RA, Peyton Jones JC, Pan J, Roberts JB, Childs PRNet al., 1999, Chemical aspects of the dynamic performance of a three-way catalyst, SAE Technical Papers

The gas components CO, CO2, HC, NOxand the AFR in the exhaust from a SI engine, both upstream and down-stream of a Pd/Rh catalytic converter, have been monitored using fast response analyzers. Regular sequential step changes in the upstream air/fuel ratio (AFR), between two pre-set levels, have been implemented with both long and short periods between the steps. For transitions from rich to lean conditions, and vice-versa, several distinct zones for the output emissions characteristics, corresponding to different states of the catalyst surface, have been identified. These results suggest that, under reducing conditions, hydrogen is stored on the catalyst surface whereas under oxidizing conditions oxygen is stored by two different processes. These chemical insights facilitate the development of realistic models for tailpipe emissions from engines which are perturbed from steady state running. Copyright © 1999 Society of Automotive Engineers, Inc.

JOURNAL ARTICLE

Jackson RA, Peyton-Jones JC, Pan J, ROberts JB, Childs PRNet al., 1999, Chemical aspects of the dynamic performance of a three-way catalyst. SAE 1999-01-0312, Society of Automotive Engineers International Congress 1999, Publisher: SAE

CONFERENCE PAPER

Childs PRN, 1998, Mechanical design, Publisher: Hodder Arnold, ISBN: 9780340692363

Concentrating mainly on rotary machine elements such as bearings, shafts, gears, seals,chains, clutches and brakes, this book provides the methodology for ...

BOOK

Ozturk HK, Childs PRN, Turner AB, Hannis JM, Turner JRet al., 1998, Three dimensional computational study of windage heating within an axial compressor stator well, ISSN: 0402-1215

Shrouded stator blades are sometimes used to prevent vibration problems, but more often they are used to eliminate blade over-tip leakage flows. A trench or recess referred to as a stator well must be provided in the rotor drum assembly in order to accommodate the stator shroud. This paper presents a computational study of the flow and windage generation within an axial compressor stator well. Windage heating levels for a three dimensional compressible solution of flow through a geometry comprising upstream and downstream stator well cavities, labyrinth seal and the stator blade row are quantified. The potential for hot fluid ejected from the upstream stator well seal into the mainstream annulus, migrating through the blade row and being re-ingested at the downstream stator well seal for further windage heating has been studied using a layered temperature boundary condition at entry to the stator row. The possible reconfiguration of detailed stator well geometry has been explored to identify options for controlling flow rate and reducing windage levels, other than controlling clearances, yielding a 9% reduction in flow rate and a 9% reduction in windage heating.

CONFERENCE PAPER

Bayley FJ, Childs PRN, 1997, Prediction of ingress rates to turbine and compressor wheelspaces, INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, Vol: 18, Pages: 218-228, ISSN: 0142-727X

JOURNAL ARTICLE

Bayley FJ, Childs PRN, 1997, Calculation of hot gas ingress and egress rates in turbomachine wheelspaces, Pages: 521-530, ISSN: 2410-4833

This paper extends methods for modelling ingress and egress rates of flow in the wheelspace formed between a stationary and rotating disc, as in a high pressure turbine, and also in stator wells formed around shrouded stator blade rows. The methods are based on the one dimensional inviscid equation of motion and are developed to model the effects of a circumferentially varying pressure boundary condition, representative of mainstream bladed annulus conditions, as well as rotational and geometrical effects. In particular this paper addresses the selection and influence of coefficients necessary for the applied use of these equations.

CONFERENCE PAPER

Childs PRN, Noronha MB, 1997, Impact of machining techniques on centrifugal compressor impeller performance, Pages: 637-643, ISSN: 0402-1215

A large proportion of modern centrifugal impellers are machined from solid forgings rather than made from cast metal. The CNC milling process offers options to manufacturers to minimize manufacturing costs whilst also enhancing performance of the impeller. Efficient manufacturing can result in cutter tool marks and paths and associated roughness remaining on the hub and blade surfaces of impellers as a result of minimizing passes and maximizing the cut. The goal of manufacturers is to allow these marks to be as deep as possible to minimize machining costs but without any negative effects in performance and possibly even enhancing it. There are existing modelling methods that predict the influence of roughness on compressor performance using the definition of an equivalent sand grain roughness. The purpose of this study is to relate the performance directly to the tool mark characteristics that are by-products of machining, namely cusp height, cutter path roughness and orientation of the cutter path relative to the local flow velocity, to review the current modelling techniques for predicting the influence of surface condition on compressor performance and to show the scope for optimization of manufacturing and performance considerations.

CONFERENCE PAPER

Ozturk HK, Childs PRN, Turner AB, 1997, Numerical solution of flow and heat transfer in axial compressor stator wells, IChemE 5th UK National Heat Transfer Conference, Publisher: Institution of Chemical Engineers

CONFERENCE PAPER

Ozturk HK, Turner AB, Childs PRN, 1997, Numerical prediction of axial compressor stator well flows, International Centre for Heat and Mass Transfer, International Symposium on Advances in Computational Heat Transfer

CONFERENCE PAPER

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