亚音速扩压器计算(二)

The Predication of Subsonic Diffusers(2)

本文用联合积分法(UIM)计算了有关的实例,与试验值相比,结果是满意的。该方法适用于计算具有附着和较大分离附面层的低亚音速二元扩压器。为了弥补该方法未考虑气流压缩性的不足,用Bower的方法和该方法相组合,计算了具有较大分离的高亚音速二元扩压器的有关参数。用组合法计算另一种低展弦比二元单曲壁亚音速扩压器,并与试验数据作了比较。当进口M数为0.8～0.3时,C_p值的相对偏差为9.8％～7.7％。σ的相对偏差为2.58％～0.67％。组合法可用于计算确定具有最佳扩压效果的二元或轴对称亚音速扩压器的几何尺寸。

A combined method ( a combination of UIM method and Bower's method) is presented in this paper to calculate the performance parameters of two-dimensional subsonic diffusers of low aspect ratio, and comparison is made between the result of calculation and the experimental date. When entrance Mach number is between 0.8 and 0.3, the relative deviations of the static and total pressure recovery are about 9.8-7.7% and 2.58-0.67% respectively. The method can be used to calculate the performance parameters of high subsonic two-dimensional or axisymmetric diffusers with flow separation and to determine the geometric size of the diffuser at optimum pressure recovery.