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采用CFD和IR综合计算分析的方法,研究了不同结构参数的二元弯曲混合管对红外抑制器性能的影响。计算结果表明:与矩形出口的二元弯曲混合管相比,波瓣型面的混合管出口增加了排气出口周长,依靠粘性和剪切力的作用实现剪切混合,二次引射能力增强,抑制器整体引射性能最大提高了19.2%。同时,混合管壁面温度也显著降低,抑制器垂直方向上3~5μm波段的红外辐射强度峰值最高降低了13.3%;在波瓣瓣高一定时,随着波瓣数增加,红外抑制器整体引射系数先增大后减小,而总压恢复系数先减小后增大;在波瓣瓣宽一定时,随着瓣高增加,红外抑制器引射系数逐渐增大,而总压恢复系数逐渐减小,辐射强度峰值最大降低了11.6%。
Using CFD and IR integrated calculation and analysis methods, the influence of different structure parameters of the dual-bend mixing tube on the performance of infrared suppressor was studied. The results show that compared with the bimodal mixed tube with rectangular outlet, the exit of the mixing tube of the lobed profile increases the perimeter of the exhaust outlet and achieves shear mixing by virtue of the viscosity and shearing force. The secondary ejection capability Enhanced, the maximum overall suppressor injection performance increased by 19.2%. At the same time, the wall temperature of the mixing tube also decreased significantly, and the peak value of the infrared radiation intensity in the 3-5 μm band in the vertical direction of the suppressor was reduced by 13.3%. When the height of the lobe flap was increased, the total number of infrared suppressor When the width of the lobe is constant, the coefficient of emissivity of the IR suppressor gradually increases with the increase of the lobe height, while the total pressure recovery coefficient Gradually decreased, the maximum radiation intensity decreased by 11.6%.