辅助进气激励器强化喷流混合的数值模拟

对采用高动量的辅助进气激励器和“常规”激励器强化的高速、大尺度喷流混合进行了数值模拟研究。对比了辅助进气激励器和“常规”激励器吹气射流对流向涡、喷流拍动、阻塞面积的影响,分析了合成射流强化喷流混合的流动滞后现象。结果表明:合成射流强化喷流混合中的辅助进气激励器在吹气时间、吹气动量、峰值动量比方面要明显优于“常规”激励器。合成射流强化喷流混合由激励器迟滞和流场迟滞两部分组成。“常规”激励器和辅助进气激励器射流峰值动量都滞后于活塞峰值速度时刻19.5%，流场滞后峰值动量时刻5%左右。相比于“常规”激励器,采用辅助进气激励器的“小突片”堵塞面积较大,强化喷流混合的效果更好。 

Numerical simulations of jet mixing enhancement of novel actuator

High-momentum novel and conventional actuators jets were used to enhance the mixing of a high speed large-scale round jet. The comparation of the blowing jet on streamwise vortices, flapping and interaction area between the novel and conventional actuators was studied. The jet mixing enhancement flow hysteresis was analyzed. Results show that the novel actuator is superior to the conventional actuator in terms of the blowing period, blowing momentum, peak jet momentum ratio. The jet mixing enhancement hysteresis consists of the actuator hysteresis and flow field hysteresis. Both the conventional actuator and novel actuator peak jet momentum lags behind the piston peak movement speed by 19.5%, and the actuator peak momentum lags behind the flow field about 5%. Compared with the conventional actuator, the interaction area of the novel actuator fluid tab is larger, leading to a better jet mixing enhancement effect.