基于混合卷吸机理的高温高压蒸汽引射器热力学设计与结构优化OA

Steam ejector technology integrated into combined heat and power systems enables effective thermal-electric decoupling and deep load following,with ejector performance directly influencing overall efficiency and operational stability.A one-dimensional thermodynamic design model for high-temperature and high-pressure steam ejectors is developed by incorporating the development characteristics of the compressible mixing layer.The concept of compressible mixing layer thickness is introduced based on the entrainment mechanism to determine the radial dimensions of the ejector.Numerical simulations are performed to evaluate ejector performance and flow field characteristics,which guide the optimization of axial dimensions.The optimal structural parameters are identified as a nozzle-to-mixing chamber distance of 6 mm,a mixing chamber length of 42 mm,and a diffuser angle of 4.4°.An experimental system is constructed to validate the proposed design method,and the results show an average relative error of 6.6%between the predicted and measured entrainment ratios,demonstrating the model's accuracy.The results provide a theoretical foundation for the structural design of high-temperature and high-pressure steam ejectors and hold significant potential for practical engineering applications.