引射器结构简单、成本低廉，在制冷系统中有显著的节能潜力，对降低制冷能耗有重要意义。混合损失大是制约引射器性能的主要因素，据此本项目提出超音速混合冲压压缩引射器（SMSC），其中引射流通道为缩放喷嘴，并设计渐缩结构压缩超音速流体，以实现：1）降低流体混合速度差；2）降低超音速流体升压激波损失。SMSC内是复杂的超音速流动，其工作特性、结构设计、应用及控制特性与常规引射器不同。首先，本项目将主动流、引射流作为两种流体建立两相数值模型，分析复杂流场下超音速流体间的相互作用，揭示SMSC的工作机理，归纳其变工况性能曲线和工况范围；其次，基于损失分析研究超音速射流、混合、压缩过程的相互影响规律，揭示其协同机制，建立结构优化设计方法；最后，研究SMSC对制冷系统性能的改善特性，并根据引射流可控的特点设计可调结构和控制策略。研究成果将为超音速引射提供理论基础，为引射器及制冷系统性能改善开辟新的方向。

The ejector with simple structure and low cost presents an obvious energy-saving potential in the refrigeration system which is effective to reduce the energy consumption for cooling supply. The mixing loss is the key factor for the low efficiency of the traditional ejector. To reduce the mixing loss, a novel ejector with supersonic mixing and stamping compression (SMSC) is proposed in this project. In SMSC, the channel for secondary flow is a nozzle, and a convergence tube is introduced to pressurize the supersonic fluid. This novel structure realizes: 1) the supersonic primary and secondary flows mix with low velocity difference; 2) reduce the loss due to normal shock wave in supersonic flow. The complex supersonic flow in SMSC make its operating characteristic, structural design, application and control different with that of the traditional ejector. Firstly, a two-phase homogeneous numerical model treating the primary and secondary flows as two kinds of fluids will be developed to feature the interaction between two supersonic flows with complex flow structure and discover the working mechanism of SMSC. Then induce the performance curve of SMSC with variable operating conditions and determine its operating range. Secondly, the quantization of irreversible loss is used to reveal the synergistic relation of the supersonic jet, supersonic mixing and compression which assists the optimization of key structural parameters. Thirdly, study the effect of SMSC on the performance improvement of the refrigeration system. Then design the adjustable SMSC and the corresponding control algorithm according to the characteristic of controllable secondary flow in SMSC. This study will provide the basic theory for supersonic entrainment and open up a new direction to improve the performance of ejector and corresponding refrigeration system.