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首页> 外文期刊>Journal of propulsion and power >Drag Reduction by Boundary-Layer Combustion: Effects of Flow Disturbances from Rectangular-to-Elliptical-Shape-Transition Inlets
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Drag Reduction by Boundary-Layer Combustion: Effects of Flow Disturbances from Rectangular-to-Elliptical-Shape-Transition Inlets

机译：边界层燃烧的减阻作用：矩形到椭圆形过渡入口的流动扰动效应

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摘要

A key issue that can affect the implementation of boundary-layer combustion for viscous drag reduction in scramjet combustors is the potential of nonuniform flow entering the combustor from the inlet Experiments were conducted in the T4 Stalker tube to study the effects of these flow nonuniformities on boundary-layer combustion in a circular constant-area combustor. A rectangular-to-elliptical shape-transition inlet, typical of the type proposed for self-starting scram jets, was designed, manufactured, and attached upstream of the combustor in the current experiments. Numerical simulations of the flow through the rectangular-to-elliptical shape-transition inlet showed that the inlet generated a nonuniform outflow that had vortices, shock waves, and expansion waves. When tested at design-point inflow conditions, the total skin friction drag measured in the combustor was reduced by 61 % when hydrogen burned in the boundary layer. These levels of reduction are similar to those measured in experiments conducted without a realistic scramjet inlet upstream of the combustor, thus demonstrating that the drag reduction brought about by boundary-layer combustion is not affected by the flow disturbances generated from the REST Met Tests conducted at off-design conditions further demonstrated that the drag reduction brought about by boundary-layer combustion was not affected by changes in the inflow conditions.
机译：可能影响边界层燃烧在超燃冲压燃烧器中降低粘性阻力的实施的关键问题是从进气口进入燃烧器的不均匀流动的可能性。在T4缠扰管中进行了实验，研究了这些不均匀流动对边界的影响恒定面积的圆形燃烧器中的多层燃烧。在当前实验中，设计，制造了矩形到椭圆形的过渡进气口，通常设计用于自动启动超燃冲压发动机，并连接到燃烧室的上游。通过矩形到椭圆形过渡入口的流动的数值模拟表明，入口产生了具有涡旋，冲击波和膨胀波的非均匀流出。在设计点入流条件下进行测试时，当氢在边界层中燃烧时，在燃烧室中测得的总皮肤摩擦阻力降低了61％。这些降低程度类似于在燃烧器上游没有实际超燃冲压进气口的情况下进行的实验中测得的降低程度，因此表明边界层燃烧所带来的阻力降低不受在REST Met测试中产生的流动扰动的影响偏离设计条件进一步证明了边界层燃烧带来的阻力减小不受流入条件变化的影响。

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  • 来源
    《Journal of propulsion and power》 |2015年第5期|1256-1267|共12页
  • 作者

    Wilson Y. K. Chan; David J. Mee; Michael K. Smart; James C. Turner;

  • 作者单位

    University of Queensland, Brisbane, Queensland 4072, Australia;

    University of Queensland, Brisbane, Queensland 4072, Australia;

    University of Queensland, Brisbane, Queensland 4072, Australia;

    University of Queensland, Brisbane, Queensland 4072, Australia;

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