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首页> 外文会议>AIAA aerodynamic measurement technology and ground testing conference;AIAA aviation forum >Mach 10 PIV Flow Field Measurements of a Turbulent Boundary Layer and Shock Turbulent Boundary Layer Interaction
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Mach 10 PIV Flow Field Measurements of a Turbulent Boundary Layer and Shock Turbulent Boundary Layer Interaction

机译：湍流边界层与激波湍流边界层相互作用的10马赫PIV流场测量

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Particle Image Velocimetry (PIV) measurements of a Mach 10 turbulent boundary layer (TBL) and shock turbulent boundary layer interaction (STBLI) have been performed on a large (2.4-m long, 9-in dia.) hollow cylinder flare (HCF) in the Arnold Engineering Development Complex Hypervelocity Wind Tunnel Number 9 (Tunnel 9) at a freestream unit Reynolds number of 16 million per meter. The large HCF produced a 23-mm thick TBL with a momentum-thickness Reynolds number Re_θ ~ 8000 1.83-m downstream of the leading edge, 200-mm upstream of the 34-deg flare. The flow was seeded locally at the wall near the leading edge by tangentially injecting a highly concentrated aerosol of PAO-4 oil droplets in a nitrogen carrier gas. Turbulent mixing allowed a fairly uniform particle concentration over a large portion of the TBL. Favorable agreement between the measured van Driest transformed stream wise velocity profile and predictions from TBL theory and Large Eddy Simulation (LES) indicates that the particle injection did not significantly alter the flow. Streamwise velocity fluctuations exhibited the expected trends and magnitudes over the majority of TBL. In the outer region, elevated streamwise velocity fluctuations were measured which appear to be due to an insufficient particle concentration and uniformity over that region. Preliminary velocity analysis of the STBLI show expected flow features, including a small separated region at the compression corner.
机译：已对大型（2.4米长，直径9英寸）空心圆柱扩口（HCF）进行了马赫数10湍流边界层（TBL）和冲击湍流边界层相互作用（STBLI）的粒子图像测速（PIV）测量。在Arnold工程开发中心的9号超高速风洞（9号隧道）中，雷诺数为每米1600万的自由流单位。大型HCF产生了23毫米厚的TBL，其前缘下游，34度耀斑上游200毫米处的动量厚度雷诺数Re_θ〜8000 1.83-m。通过切向注入高浓度的PAO-4油滴气溶胶到氮气载气中，使气流在前缘附近的壁处局部播种。湍流混合使大部分TBL上的颗粒浓度相当均匀。测得的van Driest变换流速度速度分布图与TBL理论和大涡模拟（LES）的预测之间的有利一致性表明，粒子注入不会显着改变流量。在大多数TBL上，水流速度波动表现出预期的趋势和幅度。在外部区域，测得的流向速度波动升高，这似乎是由于该区域颗粒浓度和均匀性不足所致。 STBLI的初步速度分析显示了预期的流量特征，包括压缩角处的一个较小的分离区域。

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