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Title: Flow Mechanisms and Diffusion Combustion of Turbulent Jets

Abstract

The problem of flow and combustion of turbulent jets of fuel gas in the external medium of an oxidant (air) is solved with regard to the existence of the actual boundary of the turbulent flow region of a jet. Based on the ideas of the friction force of the external flow acting on the boundary of a jet, the entrainment equation for the external medium is derived that closes the system of equations of motion of turbulent jets. The physical meaning of the dissipation rate of the turbulent energy of a jet is interpreted as the work of the friction force. To describe the combustion kinetics, the limit of instantaneous reactions corresponding to the diffusion combustion mode is used. Calculations of the effective reaction rates for reactants and the volumes occupied by them are based on the representation of a turbulent medium as an aggregation of independent turbulent particles—vortices—whose random contacts lead to the mixing and combustion of reacting substances [31]. The concomitant phenomena of flow and combustion are analyzed, including radiation effects. In particular, it is shown that the apparent increase in the combustion temperature with increasing Reynolds number is in fact attributed to the relative decrease of thermalmore » radiation losses. Qualitative agreement is obtained between the results of the theoretical calculations of the length of a combustion torch and experimental data.« less

Authors:
 [1]
  1. Russian Academy of Sciences, Institute of Applied Mechanics (Russian Federation)
Publication Date:
OSTI Identifier:
22750014
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 126; Journal Issue: 2; Other Information: Copyright (c) 2018 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMBUSTION KINETICS; EQUATIONS OF MOTION; FUEL GAS; JET MODEL; REYNOLDS NUMBER; THERMAL RADIATION; TURBULENT FLOW; VORTICES

Citation Formats

Vorotilin, V. P., E-mail: VPVorotilin@yandex.ru. Flow Mechanisms and Diffusion Combustion of Turbulent Jets. United States: N. p., 2018. Web. doi:10.1134/S1063776118010193.
Vorotilin, V. P., E-mail: VPVorotilin@yandex.ru. Flow Mechanisms and Diffusion Combustion of Turbulent Jets. United States. doi:10.1134/S1063776118010193.
Vorotilin, V. P., E-mail: VPVorotilin@yandex.ru. Thu . "Flow Mechanisms and Diffusion Combustion of Turbulent Jets". United States. doi:10.1134/S1063776118010193.
@article{osti_22750014,
title = {Flow Mechanisms and Diffusion Combustion of Turbulent Jets},
author = {Vorotilin, V. P., E-mail: VPVorotilin@yandex.ru},
abstractNote = {The problem of flow and combustion of turbulent jets of fuel gas in the external medium of an oxidant (air) is solved with regard to the existence of the actual boundary of the turbulent flow region of a jet. Based on the ideas of the friction force of the external flow acting on the boundary of a jet, the entrainment equation for the external medium is derived that closes the system of equations of motion of turbulent jets. The physical meaning of the dissipation rate of the turbulent energy of a jet is interpreted as the work of the friction force. To describe the combustion kinetics, the limit of instantaneous reactions corresponding to the diffusion combustion mode is used. Calculations of the effective reaction rates for reactants and the volumes occupied by them are based on the representation of a turbulent medium as an aggregation of independent turbulent particles—vortices—whose random contacts lead to the mixing and combustion of reacting substances [31]. The concomitant phenomena of flow and combustion are analyzed, including radiation effects. In particular, it is shown that the apparent increase in the combustion temperature with increasing Reynolds number is in fact attributed to the relative decrease of thermal radiation losses. Qualitative agreement is obtained between the results of the theoretical calculations of the length of a combustion torch and experimental data.},
doi = {10.1134/S1063776118010193},
journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 2,
volume = 126,
place = {United States},
year = {2018},
month = {2}
}