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采用数值模拟的方法,研究了混合管出口宽高比以及混合管出口掺混距离对红外抑制器整体气动性能和红外辐射特性影响,在研究参数范围内得到如下结论:相对于椭圆出口的混合管,矩形出口混合管的引射系数显著增加,且垂直方向3~5μm红外辐射强度峰值降低10.7%;随着矩形出口宽高比从2.2增大到4.6,抑制器总引射系数增大,而总压恢复系数几乎不变;延长混合管出口掺混距离,有助于提高抑制器引射能力,且压力损失几乎没有增加;无论是增加混合管出口宽高比还是增加出口掺混距离,红外抑制器水平方向和垂直方向3~5μm波段红外辐射强度都呈现逐渐减小趋势。
The effects of aspect ratio of mixing tube outlet and mixing distance at outlet of mixing tube on the overall aerodynamic performance and infrared radiation characteristics of IR suppressor were studied by numerical simulation. The following conclusions were obtained in the range of parameters studied: , The ejector coefficient of the rectangular outlet mixing tube increased significantly, and the peak value of the infrared radiation intensity of 3-5 μm in the vertical direction decreased by 10.7%. As the aspect ratio of the rectangular outlet increased from 2.2 to 4.6, the total ejector coefficient of the suppressor increased The total pressure recovery coefficient is almost unchanged; to extend the mixing tube exit mixing distance, help to improve suppressor injection capacity, and almost no increase in pressure loss; whether it is to increase the mixing tube exit aspect ratio or increase the export mixing distance, infrared Suppressor infrared radiation intensity in the horizontal and vertical directions of 3 ~ 5μm band showed a decreasing trend.