Displacement effects and scaling of ducted, supersonic flames

Wendt  M.N.; Stalker  R.J.; Jacobs  P.A.

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Displacement effects and scaling of ducted, supersonic flames

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The paper describes a study of the mechanisms for generating pressure increase within a ducted, supersonic hydrogen-air flame. The combustor consisted of a constant-area rectangular duct with a centrally located fuel injector strut that spanned the width of the duct. The free stream flows, with total enthalpies of 5.6, 6.5 and 8.9 MJ/kg, were provided by a free-piston shock tunnel and the fuel was injected from a Ludwieg tube. The wall pressure increase generated within the duct was successfully estimated by first reducing the effective core area of the duct by the combined displacement thickness of the mixing layers and wall boundary layers and then calculating the properties of the inviscid core flow assuming an isentropic compression. It was found that heat addition decreased the density of the mixing layer and subsequently increased its displacement thickness without greatly altering the layer's velocity profile. If pressure gradients and shock waves have only a minor effect on turbulence production then the displacement thickness of the mixing and boundary layers can be assumed to be independent of the height of the duct. If the duct height is changed, the resulting pressure distribution within the new duct can be predicted using the displacement thickness distribution from the original duct. The paper thus presents a form of scaling for supersonic combustion experiments.

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来源
《Combustion and Flame》 |1999年第4期|593-604|共12页
作者
Wendt M.N.; Stalker R.J.; Jacobs P.A.;
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作者单位

Univ of Queensland;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类燃料与燃烧;
关键词
Flame research; Supersonic flow; Hydrogen; Enthalpy; Fuel injection; Boundary layer flow; Wall flow; Shock waves; Turbulent flow; Pressure distribution; Density of gases; Reduction; Supersonic hydrogen-air flames; Ludwieg tunnels; Free-piston shock tunnels;

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Displacement effects and scaling of ducted, supersonic flames

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