Imperial College London
Portrait Picture

ProfessorAlexTaylor

Faculty of Engineering, Department of Mechanical Engineering

Professor
 
 
 
//

Contact

 

+44 (0)20 7594 7042a.m.taylor

 
 
//

Location

 

618City and Guilds BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Hua:2021:10.1016/j.proci.2020.08.042,
author = {Hua, X and Liu, Y and Chen, C and Hardalupas, I and Taylor, AMKP},
doi = {10.1016/j.proci.2020.08.042},
journal = {Proceedings of the Combustion Institute},
pages = {3251--3259},
title = {Mixing and scalar dissipation rate in a decaying jet},
url = {http://dx.doi.org/10.1016/j.proci.2020.08.042},
volume = {38},
year = {2021}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The temporal development of the mixing field in a decaying jet (Re = 50,000) was quantified by measuring mole  fraction and  scalar  dissipation  rate  (SDR)  in  a decaying, isothermal,turbulent gaseous  jet.  The 2D scalar  field was measured  by  using  planar  laser  induced  fluorescence  of acetone and, with appropriate image processing, this allowed estimation of the SDR using the two in-plane components within 16%error. The instantaneous and averaged distributions of the mole fractionare reported for downstream dimensionless distances up to 7 nozzle exit diameters and 35 exit flow time scales after end of injection. With advection of the last uniform exit concentration(UEC) profile coreaway from the nozzle exit, a region of weak concentration arises at the decaying jet’s trailing edge.Estimates made in a Lagrangian frame of reference show that the trailing edge of the jet becomes leaner,after the end of injection (AEI), faster than in the steady state, confirming the existence of an ‘entrainment wave’. The normalised probability density functions of the 2D SDR at various stations and times AEI differ from a lognormal distribution at both low and high SDR values with negative skewness and positive excess kurtos is. A pseudo 3DSDR, made by including an estimate  for  the  out  of  plane  component, showed reduced departure from log normal.The departure may be attributed to the disappearance of the strong shear layer associated with the absence  of  nozzle  momentum AEI.  To  the  authors’  knowledge,  this study provides  the  first measurements of the SDR in a decaying, isothermal turbulent jet.
AU  - Hua,X
AU  - Liu,Y
AU  - Chen,C
AU  - Hardalupas,I
AU  - Taylor,AMKP
DO  - 10.1016/j.proci.2020.08.042
EP  - 3259
PY  - 2021///
SN  - 0082-0784
SP  - 3251
TI  - Mixing and scalar dissipation rate in a decaying jet
T2  - Proceedings of the Combustion Institute
UR  - http://dx.doi.org/10.1016/j.proci.2020.08.042
UR  - http://hdl.handle.net/10044/1/82187
VL  - 38
ER  -
Download