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Experimental study of evolution for circular impinging micro- and macrojets

Authors
  • Litvinenko, Yu. A.1
  • Litvinenko, M. A.1
  • Zverkov, I. D.1
  • 1 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia , Novosibirsk (Russia)
Type
Published Article
Journal
Thermophysics and Aeromechanics
Publisher
Kutateladze Institute of Thermophysics SB RAS
Publication Date
Jan 01, 2021
Volume
28
Issue
1
Pages
41–54
Identifiers
DOI: 10.1134/S0869864321010054
Source
Springer Nature
Keywords
License
Yellow

Abstract

The paper describes how the acoustic impact on an impinging jet induces a maldistribution in the radial velocity field within the nearwall zone of spreading jet. The r.m.s. velocity pulsation level in the nearwall jet is lower than in the natural jet. A higher length of the laminar flow zone in a microjet was noted. The development of sinusoid-type instability facilitates a higher combustion efficiency for a propane-butane fuel mixture in the impinging microjet; this reduces the soot emission. The tests demonstrated that the zero acoustic impact makes the flame spectrum more yellow (including the flame from the nearwall zone). This testifies about deficiency of oxidizer (air) and soot presence in the combustion products. The combustion efficiency for diffusive flame in the impinging jet depends on the nozzle diameter and nozzle-target distance.

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