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Hypervelocity shock standoff on spheres in air

机译:空中球体的超高速冲击对峙

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摘要

To provide data for the validation of computational fluid dynamics models, measurements of the shock standoff distance on spheres in hypervelocity flows have been made. Test flows of air at 8.7 and 9.7 km/s were generated in the X2 expansion tunnel fitted with aMach 10 nozzle. Highspeed video images were analysed with a least-squares shapefitting algorithm. Assuming a spherical shock shape near the nose enabled increased resolution measurements beyond the native pixel size. Normalised shock standoff distances,?/D, in the range 0.03–0.04 were measured, with sphere diameters, D, of 40, 60 and 80 mm.
机译:为了提供用于验证计算流体动力学模型的数据,已对超高速流中球体上的冲击距离进行了测量。在装有Mach 10喷嘴的X2膨胀通道中产生了8.7 km / s和9.7 km / s的测试气流。使用最小二乘形状拟合算法分析了高速视频图像。假设鼻子附近呈球形冲击形状,则可以将分辨率测量提高到超出原始像素大小。测得的规范化冲击隔离距离?/ D在0.03-0.04范围内,球体直径D为40、60和80 mm。

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