Velocity and scalar fields of turbulent premixed flames in stagnation flow

P. Cho; C. K. Law; R. K. Cheng; I. G. Shepherd

doi:10.1016/S0082-0784(89)80082-7

Velocity and scalar fields of turbulent premixed flames in stagnation flow

P. Cho, C. K. Law, R. K. Cheng, I. G. Shepherd

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

Detailed experimental measurements of the scalar and velocity statistics of premixed methane/air flames stabilized by a stagnation plate are reported. Conditioned and unconditioned velocity of two components and the reaction progress variable are measured by using a two-component laser Doppler velocimetry technique and Mie scattering technique, respectively. Experimental conditions cover equivalence ratios of 0.9 and 1.0, incidence turbulence intensities of 0.3 to 0.45 m/s, and global stretch rates of 100 to 150 sec^-1. The experimental results are analyzed in the context of the Bray-Moss-Libby flamelet model of these flames. The results indicate that there is no turbulence production within the turbulent flame brush and the second and third order turbulent transport terms are reduced to functions of the difference between the conditioned mean velocity. The result of normalization of these relative veleocities by the respective velocity increase across laminar flame suggests that the mean unconditioned velocity profiles are self-similar.

Original language	English (US)
Pages (from-to)	739-745
Number of pages	7
Journal	Symposium (International) on Combustion
Volume	22
Issue number	1
DOIs	https://doi.org/10.1016/S0082-0784(89)80082-7
State	Published - 1989
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemical Engineering(all)
Fuel Technology
Energy Engineering and Power Technology
Mechanical Engineering
Physical and Theoretical Chemistry
Fluid Flow and Transfer Processes

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10.1016/S0082-0784(89)80082-7

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title = "Velocity and scalar fields of turbulent premixed flames in stagnation flow",

abstract = "Detailed experimental measurements of the scalar and velocity statistics of premixed methane/air flames stabilized by a stagnation plate are reported. Conditioned and unconditioned velocity of two components and the reaction progress variable are measured by using a two-component laser Doppler velocimetry technique and Mie scattering technique, respectively. Experimental conditions cover equivalence ratios of 0.9 and 1.0, incidence turbulence intensities of 0.3 to 0.45 m/s, and global stretch rates of 100 to 150 sec-1. The experimental results are analyzed in the context of the Bray-Moss-Libby flamelet model of these flames. The results indicate that there is no turbulence production within the turbulent flame brush and the second and third order turbulent transport terms are reduced to functions of the difference between the conditioned mean velocity. The result of normalization of these relative veleocities by the respective velocity increase across laminar flame suggests that the mean unconditioned velocity profiles are self-similar.",

author = "P. Cho and Law, {C. K.} and Cheng, {R. K.} and Shepherd, {I. G.}",

note = "Funding Information: This work was a collaborative effort between the University of California at Davis and the Lawrence Berkeley Laboratories. The work at Davis was supported by the U.S. Air Force Office of Scientific Research under Grant No. 85-0147. The work at LBL is supported by the Director, Office of Energy Research, Ofiqce of Basic Energy Sciences, Chemical Science Division of the U.S. Department of Energy under Contract No. DE-AC-O3-76SF00098. The authors would like to acknowledge the assistance of Mr. Minh Binh Hua and Mr. David Hack-worth in analyzing the conditioned velocity data. It is also a pleasure to thank Prof. Bray, Dr. Champion and Prof. Libby for their helpful discussions.",

year = "1989",

doi = "10.1016/S0082-0784(89)80082-7",

language = "English (US)",

volume = "22",

pages = "739--745",

journal = "Symposium (International) on Combustion",

issn = "0082-0784",

publisher = "Elsevier Limited",

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}

TY - JOUR

T1 - Velocity and scalar fields of turbulent premixed flames in stagnation flow

AU - Cho, P.

AU - Law, C. K.

AU - Cheng, R. K.

AU - Shepherd, I. G.

N1 - Funding Information: This work was a collaborative effort between the University of California at Davis and the Lawrence Berkeley Laboratories. The work at Davis was supported by the U.S. Air Force Office of Scientific Research under Grant No. 85-0147. The work at LBL is supported by the Director, Office of Energy Research, Ofiqce of Basic Energy Sciences, Chemical Science Division of the U.S. Department of Energy under Contract No. DE-AC-O3-76SF00098. The authors would like to acknowledge the assistance of Mr. Minh Binh Hua and Mr. David Hack-worth in analyzing the conditioned velocity data. It is also a pleasure to thank Prof. Bray, Dr. Champion and Prof. Libby for their helpful discussions.

PY - 1989

Y1 - 1989

N2 - Detailed experimental measurements of the scalar and velocity statistics of premixed methane/air flames stabilized by a stagnation plate are reported. Conditioned and unconditioned velocity of two components and the reaction progress variable are measured by using a two-component laser Doppler velocimetry technique and Mie scattering technique, respectively. Experimental conditions cover equivalence ratios of 0.9 and 1.0, incidence turbulence intensities of 0.3 to 0.45 m/s, and global stretch rates of 100 to 150 sec-1. The experimental results are analyzed in the context of the Bray-Moss-Libby flamelet model of these flames. The results indicate that there is no turbulence production within the turbulent flame brush and the second and third order turbulent transport terms are reduced to functions of the difference between the conditioned mean velocity. The result of normalization of these relative veleocities by the respective velocity increase across laminar flame suggests that the mean unconditioned velocity profiles are self-similar.

AB - Detailed experimental measurements of the scalar and velocity statistics of premixed methane/air flames stabilized by a stagnation plate are reported. Conditioned and unconditioned velocity of two components and the reaction progress variable are measured by using a two-component laser Doppler velocimetry technique and Mie scattering technique, respectively. Experimental conditions cover equivalence ratios of 0.9 and 1.0, incidence turbulence intensities of 0.3 to 0.45 m/s, and global stretch rates of 100 to 150 sec-1. The experimental results are analyzed in the context of the Bray-Moss-Libby flamelet model of these flames. The results indicate that there is no turbulence production within the turbulent flame brush and the second and third order turbulent transport terms are reduced to functions of the difference between the conditioned mean velocity. The result of normalization of these relative veleocities by the respective velocity increase across laminar flame suggests that the mean unconditioned velocity profiles are self-similar.

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Velocity and scalar fields of turbulent premixed flames in stagnation flow

Abstract

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