机匣温度边界条件对跨声转子性能的影响

In order to investigate the influence of casing temperature on the performace of transonic rotors, numerical simulation of Rotor 37 was performed with two different temperature boundary conditions at casing, adiabatic end wall and isothermal end wall. A comprehensive comparison was studied in characteristic lines, spanwise distributions of properties like total temperature at the outlet and flow structures near the casing. It indicates that compared with the adiabatic casing, the isothermal casing is more according with the experimental condition, and the spanwise distribution of total temperature at the outlet is closer to experiment data above 90% span. Although the efficiency of the cases with isothermal end wall are 2% higher than those with adiabatic end wall, it shows the temperature has little influence on the performance of Rotor 37 through the flow-field analysis. According to the contrast of entropy, it is found the conventional adiabatic efficiency formula has failed in the isothermal end wall condition because the heat transfer between the surrounding and the casing is up to 1.4%, which is non-negligible. And the efficiency of the two casing are found to be almost equal using a corrected formula which added the heat transfer effect.