合成射流激励器增强同向燃气-氧气掺混数值模拟及机理研究

建立了将合成射流激励器腔体、出口喉道及外部受控流场作为单连域计算处理的全流场计算模型(X L模型)。基于此计算模型,对合成射流激励器增强同向燃气 氧气掺混的流场进行了数值仿真和机理研究。研究表明,应用合成射流激励器可以显著增强同向燃气/氧气的掺混,其主要控制机理是合成射流激励器对同向燃气/氧气流起到流动方向控制作用,使两侧两股氧气平行射流向内发生偏转,从而大大缩短了每股射流的核心区长度;同时,激励器工作改变和加强了射流出口附近的涡结构,通过涡结构的强对流作用极大地增强了燃气/氧气平行射流在出口附近的混合。

Numerical simulation and mechanism investigation on equidirectional fuel-air/oxygen mixing enhanced by synthetic jet actuators

The overall flow field calculation model(X-L) which takes actuator cavity, exit throat and exterior flow field as a single computational region was established. Based on the calculation model, equidirectional fuel-air/oxygen mixing flow field enhanced by synthetic jet actuators was numerically simulated and investigated. The result showed that synthetic jet actuators can significantly enhance fuel-air/oxygen mixing. The main mechanism is that synthetic jet actuators controlling flow direction of fuel-air/oxygen enable the two oxygen parallel jet on both sides to deflect inwards, so as to greatly shorten core region length of every jet; at the same time, actuators alter and strengthen the vortex structure near the jet exit, and the strong convection action of the vortex structure significanfly enhances fuel-air/oxygen parallel jet mixing near the exit.