以巴斯大学1.5级燃气涡轮实验台为研究对象进行数值模拟，对不同封严流量下轮缘处的周向压力场进行对比，追踪封严流和主流的流动路径，分析主流入侵对轮缘附近区域流场的影响。分析实验设备的物理模型，在保证其主体部件几何形状不变的基础上将其简化，保留叶栅通道和盘腔，湍流模型选取SST模型。数值模拟边界条件为转速3 000 r/min，旋转雷诺数为8.64×105，主流雷诺数为3.41×105，流动速率为0.395，主流流量为1.08 kg/s，轮缘处周向速度为59.7 m/s，主流速度为25.8 m/s，主流温度为303 K，出口压力为101 325 Pa。结果表明：主流入侵主要是因为轮缘外的压力分布不均；随着封严流量的增加，主流入侵量减少，增加了下游的压力水平；导叶尾缘处是主要的入侵区域。

Taking the 1.5stage gas turbine test bench at the University of Bath as the research object,the numerical simulation was carried out to compare the circumferential pressure field at the wheel rim under different sealing flows, track the sealing flow and the flow path of the mainstream,and analyze the influence of mainstream intrusion on the flow field near the wheel rim. The physical model of the experimental equipment was analyzed,which was simplified on the basis of keeping the geometric shape of the main components unchanged. The cascade channel and disk cavity were retained,and the SST model was selected as the turbulence model. The boundary conditions of numerical simulation were as follows: rotational speed of 3 000 r/min,rotating Reynolds number of 8.64×105,mainstream Reynolds number of 3.41×105,flow rate of 0.395,mainstream flow of 1.08 kg/s,circumferential velocity at the rim of 59.7 m/s, mainstream velocity of 25.8 m/s,mainstream temperature of 303 K and outlet pressure of 101 325 Pa.The analysis results show that the mainstream intrusion is mainly due to the uneven distribution of pressure outside the rim.With the increase of sealing flow,the amount of mainstream intrusion decreases and the downstream pressure level increases.The trailing edge of guide vane is the main intrusion area.

TK477

黑龙江省自然科学基金（LH2020E066）