针对平板空气舵模型，在激波风洞马赫数为10、单位雷诺数为2.1×10⁶/m的来流条件下，采用纹影和热流传感器进行了主动引射气体对高超声速流场调控和降热规律的试验研究。获得了不同马赫数和压力的主动引射气体条件下，流场的激波结构和模型表面热流通量。试验数据表明：在空气舵上游通过主动引射气体进行流场调控，能够降低平板和空气舵的干扰加热；引射气体马赫数为2时，降热效果达到45%，引射气体马赫数为4时，降热效果达到70%以上；随着引射气体马赫数和压力的增大，引射喷口下方的平板、舵尖、舵面和舵轴的降热效果越好，热流降低幅值和区域均会增大；可以通过提高引射气体的压力，在较低的引射气体马赫数下达到与高马赫数引射气体相同的流场控制效果；主动引射气体对边界层流态和厚度的改变是决定平板空气舵降热效果的主控因素；高超声速流场中，较低马赫数的引射气体就能够改变下游的流态，但只有较高马赫数或较高压力的引射气体，才能对下游产生较好的降热效果；从气体流量需求的角度出发，建议采用“高马赫数、低压力”的引射出口参数进行引射系统设计。

For the flat plate air rudder model， under the conditions of Mach number of 10 and unit Reynolds number of 2.1×10⁶/m in the shock wind tunnel， the regulation of hypersonic flow field and the law of heat flux reduction by actively ejecting gas were experimentally studied using schlieren and heat flux sensors. The shock wave structure of the flow field and the heat flux on the model surface were obtained under the conditions of actively ejecting gas at different Mach numbers and pressures. The experimental data show that the interference heat flux of the flat plate and the air rudder can be reduced by actively ejecting the air flow field upstream of the air rudder； when the Mach number of the ejected gas is 2， the heat flux reduction effect reaches 45%， and when the Mach number of the ejected gas is 4， the heat flux reduction effect reaches more than 70%； with the increase of the Mach number and pressure of the ejected gas， the better the heat flux reduction effect of the flat plate， rudder tip， rudder surface and rudder shaft below the ejected nozzle is， and the amplitude and area of the heat flux reduction will increase； by increasing the pressure of the ejected gas， the flow field control effect of the ejected gas at low Mach number is the same as that of the ejected gas at high Mach number； the change of the boundary layer flow pattern and thickness caused by the active injection of gas is the main control factor to determine the heat flux reduction effect of the flat air rudder； in the hypersonic flow field， the ejected gas at a lower Mach number can change the flow pattern downstream， but only the ejected gas at a higher Mach number or pressure can produce a better heat flux reduction effect downstream； from the point of view of gas flow demand， it is suggested to adopt the ejector outlet parameters of “high Mach number， low pressure” for the design of the ejector system.