EFFECT OF STRETCH AND PREFERENTIAL DIFFUSION IN SPHERICALLY PROPAGATING H2/AIR PREMIXED FLAMES

S. D. Lee; Suk Ho Chung

doi:10.1615/ihtc11.4350

EFFECT OF STRETCH AND PREFERENTIAL DIFFUSION IN SPHERICALLY PROPAGATING H2/AIR PREMIXED FLAMES

S. D. Lee, Suk Ho Chung

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The effects of stretch and preferential diffusion on premixed flame behavior are studied for inwardly/outwardly propagating spherical flames in hydrogen/air mixtures. A local adiabatic equilibrium temperature is proposed as a measure of energy gain/loss caused by preferential diffusion" and flame stretch, which can be calculated from local and temporal concentrations and temperature during flame propagation. Various effects, including flame stretch, preferential diffusion, and adiabatic compression, can be explained based on local equilibrium temperature profiles for both inwardly/outwardly propagating lean and rich H2/air flames. A dip/jump in local equilibrium temperature profiles is observed which indicate fast hydrogen diffusion. Relative changes in burnt temperature compared to unburned temperature explain the energy gain/loss from preferential diffusion and stretch.

Original language	English (US)
Title of host publication	Proceeding of International Heat Transfer Conference 11
Publisher	Begell House
ISBN (Print)	1560327979
DOIs	https://doi.org/10.1615/ihtc11.4350
State	Published - May 22 2019

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title = "EFFECT OF STRETCH AND PREFERENTIAL DIFFUSION IN SPHERICALLY PROPAGATING H2/AIR PREMIXED FLAMES",

abstract = "The effects of stretch and preferential diffusion on premixed flame behavior are studied for inwardly/outwardly propagating spherical flames in hydrogen/air mixtures. A local adiabatic equilibrium temperature is proposed as a measure of energy gain/loss caused by preferential diffusion{"} and flame stretch, which can be calculated from local and temporal concentrations and temperature during flame propagation. Various effects, including flame stretch, preferential diffusion, and adiabatic compression, can be explained based on local equilibrium temperature profiles for both inwardly/outwardly propagating lean and rich H2/air flames. A dip/jump in local equilibrium temperature profiles is observed which indicate fast hydrogen diffusion. Relative changes in burnt temperature compared to unburned temperature explain the energy gain/loss from preferential diffusion and stretch.",

author = "Lee, {S. D.} and Chung, {Suk Ho}",

note = "KAUST Repository Item: Exported on 2021-04-14",

year = "2019",

month = may,

day = "22",

doi = "10.1615/ihtc11.4350",

language = "English (US)",

isbn = "1560327979",

booktitle = "Proceeding of International Heat Transfer Conference 11",

publisher = "Begell House",

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T1 - EFFECT OF STRETCH AND PREFERENTIAL DIFFUSION IN SPHERICALLY PROPAGATING H2/AIR PREMIXED FLAMES

AU - Lee, S. D.

AU - Chung, Suk Ho

N1 - KAUST Repository Item: Exported on 2021-04-14

PY - 2019/5/22

Y1 - 2019/5/22

N2 - The effects of stretch and preferential diffusion on premixed flame behavior are studied for inwardly/outwardly propagating spherical flames in hydrogen/air mixtures. A local adiabatic equilibrium temperature is proposed as a measure of energy gain/loss caused by preferential diffusion" and flame stretch, which can be calculated from local and temporal concentrations and temperature during flame propagation. Various effects, including flame stretch, preferential diffusion, and adiabatic compression, can be explained based on local equilibrium temperature profiles for both inwardly/outwardly propagating lean and rich H2/air flames. A dip/jump in local equilibrium temperature profiles is observed which indicate fast hydrogen diffusion. Relative changes in burnt temperature compared to unburned temperature explain the energy gain/loss from preferential diffusion and stretch.

AB - The effects of stretch and preferential diffusion on premixed flame behavior are studied for inwardly/outwardly propagating spherical flames in hydrogen/air mixtures. A local adiabatic equilibrium temperature is proposed as a measure of energy gain/loss caused by preferential diffusion" and flame stretch, which can be calculated from local and temporal concentrations and temperature during flame propagation. Various effects, including flame stretch, preferential diffusion, and adiabatic compression, can be explained based on local equilibrium temperature profiles for both inwardly/outwardly propagating lean and rich H2/air flames. A dip/jump in local equilibrium temperature profiles is observed which indicate fast hydrogen diffusion. Relative changes in burnt temperature compared to unburned temperature explain the energy gain/loss from preferential diffusion and stretch.

UR - http://hdl.handle.net/10754/667833

UR - http://ihtcdigitallibrary.com/conferences/7d6ce0dc3b4c5dd2,797e9f225ed6dfa6,5bee5bc359888234.html

U2 - 10.1615/ihtc11.4350

DO - 10.1615/ihtc11.4350

M3 - Conference contribution

SN - 1560327979

BT - Proceeding of International Heat Transfer Conference 11

PB - Begell House

ER -

EFFECT OF STRETCH AND PREFERENTIAL DIFFUSION IN SPHERICALLY PROPAGATING H2/AIR PREMIXED FLAMES

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