混合制冷工质波转子结构性能优化OA北大核心CSTPCD

Embedding the wave rotor into the auto-cascade refrigeration cycle,using motion excitation wave and expansion wave can realize the direct exchange of volume work within the equipment channel,which shortens the energy transfer path of high and low pressure flow units and is beneficial to improving the energy efficiency of the refrigeration system.The wave diagram of R134a/R23 mixed refrigerant wave rotor with 1.8 of expansion ratio and 1.25 of pressure ratio is completed by means of numerical calculation.Considering performance effects of the circumferential component of the inlet and outlet fluid velocities of the wave rotor equipment,the optimization of the tilted angle of the inlet and outlet is completed.It is found that the structure with medium pressure outlet tilted at 6°,high pressure inlet tilted at 3° and low pressure inlet tilted at 2° in the rotation direction can increase the theoretical entrainment ratio of the wave rotor from 33.20％to 37.29％,which achieves the optimal induced performance of the wave rotor with small expansion ratio.According to the wave diagram,axial dissipation of the contact surface of high and low pressure flow units is small and no sharp decrease in the entrainment ratio is found when the axial dimension is shortened by 50％on the basis of the original dimension.The conclusion is of great significance to shortening the axial dimension of the wave rotor.