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首页> 外文期刊>AIAA Journal >Effect of Scarfing on Rectangular Nozzle Supersonic Jet Plume Flow Characteristics
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Effect of Scarfing on Rectangular Nozzle Supersonic Jet Plume Flow Characteristics

机译：围巾对矩形喷嘴超声速射流流动特性的影响

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摘要

An experimental and computational fluid dynamics study is reported of supersonic jets issuing from a high-aspect-ratio rectangular convergent-divergent nozzle with and without a scarfed exit. Schlieren visualization and laser Doppler anemometry measurements captured near-field aerodynamic development of an unheated jet at overexpanded, design, and underexpanded conditions. Reynolds-averaged Navier-Stokes computational fluid dynamics predictions using an eddy viscosity closure (Spalart-Allmaras model) for clean and scarfed geometries were compared with measurements to examine the ability to capture nozzle scarfing effects. The measured plume shape for a scarfed nozzle was strongly affected at overexpanded conditions (a distorted four-lobe shape was observed), whereas a rectangular shape was retained for underexpanded flow although plume bifurcation occurred. The development of the plume shape and the mixing rate was a consequence of the strong vortices that occur with rectangular nozzles, with extra vortices introduced by scarfing. The nozzle exit static pressure changed dramatically when scarfing was added, influencing plume secondary flows and near-field development. The main features of scarfed jet development were predicted qualitatively correctly; the four-lobe overexpanded shape was reproduced but the strength of pressure-driven secondary velocities was overpredicted. The experimental data provided represent a challenging validation test case for computational fluid dynamics studies of three-dimensional supersonic jet plumes with scarfed interaction effects.
机译：进行了实验和计算流体动力学研究，报道了从高纵横比矩形会聚发散喷嘴喷出的超音速射流，带或不带围巾状出口。 Schlieren可视化技术和激光多普勒风速测定法测量了在过度膨胀，设计和膨胀不足条件下未加热射流的近场空气动力学发展。将雷诺平均的Navier-Stokes计算流体动力学预测（使用涡流粘度封闭（Spalart-Allmaras模型））用于干净几何形状和火焰状的几何形状与测量结果进行比较，以检查捕获喷嘴火焰状效应的能力。在过度膨胀的条件下，测得的带盖喷嘴的羽流形状会受到很大的影响（观察到扭曲的四叶形），而尽管发生羽流分叉，但矩形会保留用于膨胀不足的流动。羽状形状和混合速率的发展是矩形喷嘴产生强烈涡流的结果，而喷头会引入额外的涡流。添加火焰清理后，喷嘴出口静压力发生了巨大变化，影响了羽流二次流和近场展开。定型地预测了喷气式喷气发动机发展的主要特征；重现了四瓣过度膨胀的形状，但压力驱动的次级速度的强度却被过度预测。所提供的实验数据代表了具有三维相互作用的三维超声速射流羽流的计算流体动力学研究的具有挑战性的验证测试案例。

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  • 来源
    《AIAA Journal》 |2018年第1期|301-315|共15页
  • 作者

    Behrouzi P.; McGuirk J. J.; Avenell C.;

  • 作者单位

    Loughborough Univ Technol, Dept Aeronaut & Automot Engn, Loughborough LE11 3TU, Leics, England;

    Loughborough Univ Technol, Dept Aeronaut & Automot Engn, Loughborough LE11 3TU, Leics, England;

    Rolls Royce PLC, WH-64 Whittle House,POB 3, Bristol BS34 7QE, England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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