几何对称横向射流入射对尾喷流红外辐射特征抑制的数值研究

降低高温核心区长度是减小尾喷流红外辐射的有效途径。针对某轴对称收敛喷管,研究1种横向射流主动强化尾喷流掺混与红外抑制技术,采用横向射流技术强化外流与热喷流的掺混,通过数值模拟方法研究了2股横向射流喷射频率与流量变化对强化尾喷流掺混与红外抑制特性的影响规律。结果表明:在与横向射流流动方向垂直的探测面上尾喷流辐射强度衰降明显,探测角度为90°时红外辐射强度衰降可达48%。随着2股射流流量差的减小,强化掺混与红外抑制效果逐渐增强。

Numerical Investigation of Infrared Radiation Suppression Characteristics for Plume with Geometric Symmetrical Transverse Jets

Decreasing the plume temperature is an effective way to reduce infrared radiation of plume. Aiming at an axisymmetric convergent nozzle, a mixing and infrared suppression technology of the plume was studied, which enhanced by a transverse jet including the outer and hot jet mixing. The influence law of the frequency and flow changing for two kinds of transverse jets on enhancing the plume mixing and infrared suppression characteristics was studied by the numerical simulation. The results show that the radiation intensity of the plume is significantly reduced on the vertical transverse jet. The intensity of infrared radiation reduced by 48% when the detection angle is 90°. The results of enhanced mixing and infrared suppression are increased gradually with the decrease of flow deviation for the two kinds of jets.