| Based on the EKalina cycle which was proposed in the previous work, the paper proposed a thermodynamic model of the liquid-vapor ejector with ammonia-water mixture to optimize the performance and structre of ejector, and the analysis of ejection effect on the performance of EKalina cycle was studied with the equation of energy conservation, momentum conservation, mass conservation and the structure. Due to the complex flow phenomenon such as shock wave within the two-phase ejector, the two-phase ejector can produce pressure-lifting. The paper used the basic principle of thermodynamic to analyze the booster characteristics of the two-phase ejector.The two-phase flow model of liquid-vapor ejector with ammonia-water mixture was established. The ejector based on one-dimensional steady-state model without gravity and gas-liquid mass transfer, and the heat transfer between the two-phase and the influence of friction on flow were considered. The operation program was compiled on Matlab platform which analyzed the flow computation of nozzle and diffuser and worked out the velocity field and pressure field of the primary fluid and the secondary flow. The influence of the ejector structure on the EKalina cycle performance was analyzed to perform the cycle's optimization.The isobaric curves are very dense and divergence to the place of high enthalpy in the enthalpy-entropy(h-s) chart, and the isobaric curves have tiny radian upper right slope. On this basis, the calculation program was compiled on the Matlab platform. The ideal booster characteristics of the two-phase ejector, and the liquid-vapor ejector and vapor-liquid ejector booster characteristics were analyzed. |
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