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{Hampp:2020:10.1016/j.combustflame.2020.05.007,
author = {Hampp, F and Lindstedt, RP},
doi = {10.1016/j.combustflame.2020.05.007},
journal = {Combustion and Flame},
pages = {134--149},
title = {Quantification of fuel chemistry effects on burning modes in turbulent premixed flames},
url = {http://dx.doi.org/10.1016/j.combustflame.2020.05.007},
volume = {218},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The present work quantifies the impact of fuel chemistry on burning modes using premixed dimethyl ether (DME), ethanol (EtOH) and methane flames in a back-to-burnt opposed jet configuration. The study considers equivalence ratios 0 ≤ Φ ≤ 1, resulting in a Damköhler (Da) number range 0.06 ≤  Da  ≤ 5.1. Multi-scale turbulence (Re    19,550 and Ret   360) is generated by means of a cross fractal grid and kept constant along with the enthalpy of the hot combustion products (THCP = 1700 K) of the counterflow stream. The mean turbulent rate of strain exceeds the laminar extinction rate for all flames. Simultaneous Mie scattering, OH-PLIF and PIV are used to identify reactants, mixing, weakly reacting, strongly reacting and product fluids. The relative balance between conventional flame propagation and auto-ignition based combustion is highlighted using suitably defined Da numbers and a more rapid transition towards self-sustained (e.g. flamelet type) combustion is observed for DME. The strain rate distribution on the reactant fluid surface for methane remains similar to the (non-reactive) mixing layer (), while DME and EtOH flames gradually detach from the stagnation plane with increasing Φ leading to stabilisation in regions with lower compressive rates of strain. The study further provides information on the conditions leading to burning mode transitions via (i) multi-fluid probabilities, (ii) structural flow field information and turbulence-flame interactions delineated by means of conditional (iii) velocity statistics and (iv) the rate of strain along fluid iso-contours.
AU  - Hampp,F
AU  - Lindstedt,RP
DO  - 10.1016/j.combustflame.2020.05.007
EP  - 149
PY  - 2020///
SN  - 0010-2180
SP  - 134
TI  - Quantification of fuel chemistry effects on burning modes in turbulent premixed flames
T2  - Combustion and Flame
UR  - http://dx.doi.org/10.1016/j.combustflame.2020.05.007
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000541918700015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.sciencedirect.com/science/article/pii/S0010218020301826?via%3Dihub
UR  - http://hdl.handle.net/10044/1/80824
VL  - 218
ER  -
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