Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures

Qiang Wang; Longhua Hu; Suk Ho Chung

doi:10.1016/j.combustflame.2016.11.016

Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures

Qiang Wang, Longhua Hu, Suk Ho Chung

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14 Scopus citations

Abstract

Blow-out limits of nonpremixed turbulent jet flames in quiescent air at sub-atmospheric pressures (50–100 kPa) were studied experimentally using propane fuel with nozzle diameters ranging 0.8–4 mm. Results showed that the fuel jet velocity at blow-out limit increased with increasing ambient pressure and nozzle diameter. A Damköhler (Da) number based model was adopted, defined as the ratio of characteristic mixing time and characteristic reaction time, to include the effect of pressure considering the variations in laminar burning velocity and thermal diffusivity with pressure. The critical lift-off height at blow-out, representing a characteristic length scale for mixing, had a linear relationship with the theoretically predicted stoichiometric location along the jet axis, which had a weak dependence on ambient pressure. The characteristic mixing time (critical lift-off height divided by jet velocity) adjusted to the characteristic reaction time such that the critical Damköhler at blow-out conditions maintained a constant value when varying the ambient pressure.

Original language	English (US)
Pages (from-to)	358-360
Number of pages	3
Journal	Combustion and Flame
Volume	176
DOIs	https://doi.org/10.1016/j.combustflame.2016.11.016
State	Published - Dec 9 2016

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the National Natural Science Foundation of China (NSFC) under Grant no. 51606057, Key Project of NSFC under Grant no. 51636008, Excellent Young Scientist Fund of NSFC under Grant no. 51422606, Newton Advanced Fellowship (RS Grant no. NA140102; NSFC Grant no. 5141101261), Key Research Program of Frontier Sciences, Chinese Academy of Science (CAS) under Grant no. QYZDB-SSW-JSC029, Fok Ying Tong Education Foundation under Grant no. 151056, Fundamental Research Funds for the Central Universities under Grant no. WK2320000035, and China Postdoctoral Science Foundation (No. 2016M590580). SHC was supported by King Abdullah University of Science and Technology (KAUST).

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10.1016/j.combustflame.2016.11.016

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title = "Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures",

abstract = "Blow-out limits of nonpremixed turbulent jet flames in quiescent air at sub-atmospheric pressures (50–100 kPa) were studied experimentally using propane fuel with nozzle diameters ranging 0.8–4 mm. Results showed that the fuel jet velocity at blow-out limit increased with increasing ambient pressure and nozzle diameter. A Damk{\"o}hler (Da) number based model was adopted, defined as the ratio of characteristic mixing time and characteristic reaction time, to include the effect of pressure considering the variations in laminar burning velocity and thermal diffusivity with pressure. The critical lift-off height at blow-out, representing a characteristic length scale for mixing, had a linear relationship with the theoretically predicted stoichiometric location along the jet axis, which had a weak dependence on ambient pressure. The characteristic mixing time (critical lift-off height divided by jet velocity) adjusted to the characteristic reaction time such that the critical Damk{\"o}hler at blow-out conditions maintained a constant value when varying the ambient pressure.",

author = "Qiang Wang and Longhua Hu and Chung, {Suk Ho}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: This work was supported by the National Natural Science Foundation of China (NSFC) under Grant no. 51606057, Key Project of NSFC under Grant no. 51636008, Excellent Young Scientist Fund of NSFC under Grant no. 51422606, Newton Advanced Fellowship (RS Grant no. NA140102; NSFC Grant no. 5141101261), Key Research Program of Frontier Sciences, Chinese Academy of Science (CAS) under Grant no. QYZDB-SSW-JSC029, Fok Ying Tong Education Foundation under Grant no. 151056, Fundamental Research Funds for the Central Universities under Grant no. WK2320000035, and China Postdoctoral Science Foundation (No. 2016M590580). SHC was supported by King Abdullah University of Science and Technology (KAUST).",

year = "2016",

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doi = "10.1016/j.combustflame.2016.11.016",

language = "English (US)",

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pages = "358--360",

journal = "Combustion and Flame",

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T1 - Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures

AU - Wang, Qiang

AU - Hu, Longhua

AU - Chung, Suk Ho

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: This work was supported by the National Natural Science Foundation of China (NSFC) under Grant no. 51606057, Key Project of NSFC under Grant no. 51636008, Excellent Young Scientist Fund of NSFC under Grant no. 51422606, Newton Advanced Fellowship (RS Grant no. NA140102; NSFC Grant no. 5141101261), Key Research Program of Frontier Sciences, Chinese Academy of Science (CAS) under Grant no. QYZDB-SSW-JSC029, Fok Ying Tong Education Foundation under Grant no. 151056, Fundamental Research Funds for the Central Universities under Grant no. WK2320000035, and China Postdoctoral Science Foundation (No. 2016M590580). SHC was supported by King Abdullah University of Science and Technology (KAUST).

PY - 2016/12/9

Y1 - 2016/12/9

N2 - Blow-out limits of nonpremixed turbulent jet flames in quiescent air at sub-atmospheric pressures (50–100 kPa) were studied experimentally using propane fuel with nozzle diameters ranging 0.8–4 mm. Results showed that the fuel jet velocity at blow-out limit increased with increasing ambient pressure and nozzle diameter. A Damköhler (Da) number based model was adopted, defined as the ratio of characteristic mixing time and characteristic reaction time, to include the effect of pressure considering the variations in laminar burning velocity and thermal diffusivity with pressure. The critical lift-off height at blow-out, representing a characteristic length scale for mixing, had a linear relationship with the theoretically predicted stoichiometric location along the jet axis, which had a weak dependence on ambient pressure. The characteristic mixing time (critical lift-off height divided by jet velocity) adjusted to the characteristic reaction time such that the critical Damköhler at blow-out conditions maintained a constant value when varying the ambient pressure.

AB - Blow-out limits of nonpremixed turbulent jet flames in quiescent air at sub-atmospheric pressures (50–100 kPa) were studied experimentally using propane fuel with nozzle diameters ranging 0.8–4 mm. Results showed that the fuel jet velocity at blow-out limit increased with increasing ambient pressure and nozzle diameter. A Damköhler (Da) number based model was adopted, defined as the ratio of characteristic mixing time and characteristic reaction time, to include the effect of pressure considering the variations in laminar burning velocity and thermal diffusivity with pressure. The critical lift-off height at blow-out, representing a characteristic length scale for mixing, had a linear relationship with the theoretically predicted stoichiometric location along the jet axis, which had a weak dependence on ambient pressure. The characteristic mixing time (critical lift-off height divided by jet velocity) adjusted to the characteristic reaction time such that the critical Damköhler at blow-out conditions maintained a constant value when varying the ambient pressure.

UR - http://hdl.handle.net/10754/622178

UR - http://www.sciencedirect.com/science/article/pii/S001021801630356X

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U2 - 10.1016/j.combustflame.2016.11.016

DO - 10.1016/j.combustflame.2016.11.016

M3 - Article

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VL - 176

SP - 358

EP - 360

JO - Combustion and Flame

JF - Combustion and Flame

ER -

Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures

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