航空发动机压气机内气液非平衡冷却特性研究

Given the influence of the atomization cooling of the incoming flow of the aero-turbine engine on the internal airflow of the compressor, the non-equilibrium transmission process of gas-liquid two-phase on heat and mass transfer is analyzed based on the Eulerian-Lagrangian multiphase flow method. And then, the motion factor of the liquid film on the wall is considered. Moreover, the time-domain fluctuation sensitivity of the characteristic parameters of the compressor is transformed into an analysis of the frequency-domain power spectral density by the Fast Fourier Transform (FFT) method. Results show that the non-equilibrium evaporation phase transition in the compressor can easily induce the unsteady aerodynamic fluctuation of the flow field in time and space. The atomization cooling parameters have a linear relationship with the total temperature ratio and a nonlinear relationship with both total-pressure ratio and efficiency. In the range of 0.5% ~ 5% water/air ratio and 1~9μm mist particle mean size, the fluctuation degree of total-pressure ratio in the time domain is higher when water/air ratio is lower or mist particle mean size is smaller.The fluctuation degree of total-temperature ratio in the time domain is stronger when the water/air ratio is lower or atomization particle mean size is larger. The fluctuation degree of efficiency in the time domain is higher when water/air ratio is higher or mist particle mean size is larger. Simultaneously, the sensitivity of the change of water/air ratio to the time domain fluctuation of flow field during the wet compressor is greater than that of mist particle size.