Imperial College London
Alternate

Professor of Thermofluids Mechanical Engineering

Central Faculty, Office of the Provost

Associate Provost (Academic Promotions)
 
 
 
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Contact

 

p.lindstedt

 
 
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Location

 

613City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Goh:2013:6/061403,
author = {Goh, KHH and Geipel, P and Hampp, F and Lindstedt, RP},
doi = {6/061403},
journal = {Fluid Dynamics Research},
title = {Flames in fractal grid generated turbulence},
url = {http://dx.doi.org/10.1088/0169-5983/45/6/061403},
volume = {45},
year = {2013}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Twin premixed turbulent opposed jet flames were stabilized for lean mixtures of air with methane and propane in fractal grid generated turbulence. A density segregation method was applied alongside particle image velocimetry to obtain velocity and scalar statistics. It is shown that the current fractal grids increase the turbulence levels by around a factor of 2. Proper orthogonal decomposition (POD) was applied to show that the fractal grids produce slightly larger turbulent structures that decay at a slower rate as compared to conventional perforated plates. Conditional POD (CPOD) was also implemented using the density segregation technique and the results show that CPOD is essential to segregate the relative structures and turbulent kinetic energy distributions in each stream. The Kolmogorov length scales were also estimated providing values ∼0.1 and ∼0.5 mm in the reactants and products, respectively. Resolved profiles of flame surface density indicate that a thin flame assumption leading to bimodal statistics is not perfectly valid under the current conditions and it is expected that the data obtained will be of significant value to the development of computational methods that can provide information on the conditional structure of turbulence. It is concluded that the increase in the turbulent Reynolds number is without any negative impact on other parameters and that fractal grids provide a route towards removing the classical problem of a relatively low ratio of turbulent to bulk strain associated with the opposed jet configuration.
AU  - Goh,KHH
AU  - Geipel,P
AU  - Hampp,F
AU  - Lindstedt,RP
DO  - 6/061403
PY  - 2013///
SN  - 0169-5983
TI  - Flames in fractal grid generated turbulence
T2  - Fluid Dynamics Research
UR  - http://dx.doi.org/10.1088/0169-5983/45/6/061403
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000328121900004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
UR  - https://iopscience.iop.org/article/10.1088/0169-5983/45/6/061403
VL  - 45
ER  -
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