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在低速自由射流风洞上 ,利用热线及相关设备对由半球头部、颈部及旋成体构成的特型钝体周围非定常流动的基本特性、联合特性及湍流度分布进行了测试与分析 ,实验工况为迎角α=- 1 5°～+1 5°、侧滑角 β =0°～ 1 0°。结果表明 ,在上述工况范围内 ,该钝体周围流场中速度脉动的能量分布平坦 ,属宽频带随机信号 ,流场中没有发生明显的流动分离 ,流场动态品质良好 ;凹陷区内气流的脉动以不同的速度向下游空间传播 ;在上述α、β变化范围内 ,钝体颈部凹陷区的最大湍流度高达 1 0 .9～ 2 4.8%。
In the low-velocity free jet wind tunnel, the basic characteristics, joint characteristics and turbulence distribution of the unsteady flow around a special-shaped bluff body composed of the head, neck and spinous body of the hemisphere were tested and analyzed by hot wire and related equipment. Experimental conditions for the angle of attack α = - 15 ° ~ + 15 °, side slip angle β = 0 ° ~ 1 0 °. The results show that the energy distribution of the velocity pulsation in the flow field around the bluff body is flat and belongs to a wideband random signal within the above working conditions. There is no obvious flow separation in the flow field and the dynamic quality of the flow field is good. Of the pulsation at different speeds to the downstream space; in the above α, β variation range, blunt body neck depression area maximum turbulence as high as 10.9 ~ 248%.