波瓣混合器流场试验

为了获得加力燃烧室波瓣混合器内的三维流场,采用带热电偶的五孔探针对波瓣混合器内的流场进行了测量.通过试验,得到了波瓣混合器出口不同截面的速度场和温度场,以及波瓣混合器沿流向的热混合效率、总压恢复系数变化规律.试验结果表明:在波瓣混合器尾缘处会产生一对相互逆转的流向涡,流向涡的产生加强了内、外涵气流的对流混合;越靠近波瓣混合器尾缘,内、外涵掺混能力越强,热混合效率增加速度越快,总压恢复系数下降也越快.

Experiment of flow field in lobed mixer

In order to obtain the three-dimensional flow field of afterburner lobed mixer, a five-hole probe with thermocouple was applied to measure the flow field of the lobed mixer. The velocity and temperature fields in different sections at the lobed mixers outlet were obtained in the experiments, and the change rules of the thermal mixing efficiency and the total pressure recovery coefficient in the flow direction were measured. The experimental results indicate that a pair of inverse direction streamwise vortexes are generated in the trailing edge of lobed mixer, which strengthens the degree of the mixed convection between inner bypass and external bypass. The closer to the trailing edge of the lobed mixer, the greater the mixing degree of the flow between inner bypass and external bypass, the quicker the thermal mixing efficiency increasing, the faster the total pressure recovery coefficient declining.