横向射流对凹腔湍流特性影响的数值模拟

Numerical Simulation of Transverse Injection on Turbulence Characteristics in Cavity

为拓宽先进旋涡燃烧室运用领域,探索横向射流与先进旋涡燃烧室凹腔之间的相互作用,采用数值模拟方法,研究了燃料横向射流对凹腔内旋涡结构和燃料分布的影响,以及射流对燃烧室湍流燃烧流动的作用规律。结果表明,冷态射流时,凹腔内湍流强度随射流中心距凹腔的距离增大而增大,且旋涡结构逐渐趋于均匀稳定对称;横向射流可加强燃料与空气的卷吸混合,同时加剧凹腔内质量扩散输运;射流燃烧时,凹腔内可形成高温区域,但旋涡流场由冷态时的两对旋涡结构转变为单对旋涡结构,且旋涡相对不稳定。

In order to extend the application field of Advonced Vortex Combustor(AVC),the interaction of transverse injection and the cavity in AVC was investigated numerically.The effects of fuel transverse injection on the vortex structure and fuel distribution in cavity were simulated and the influence rule of injection on the turbulent combustion flow in combustor was also studied by using numerical simulation method.The results show that the vortexes become symmetrically stable and the turbulence intensity of cavity increases as the distance between the injection location and the cavity increases under the cold injection state.The transverse injection increases the mixture efficiency of fuel and air,and intensifies the mass transport in cavity.The cavity can form high temperature area under the jet flow combustion state,but compared to the cold state,the vortex flow with two pairs of vortexes in cavity evolves into one pair,and the structure becomes more unstable relatively.