新型喷嘴结构下蒸汽喷射式热泵性能的数值研究

运用CFD数值模拟方法对比研究了普通喷嘴和新型喷嘴结构对蒸汽喷射式热泵操作性能的影响，并分析了整流管长度和喷射系数之间的变化关系。结果表明，在相同的操作条件下，整流喷嘴结构能有效地提高喷射器的喷射系数。同时存在一最佳整流管长度，对应于最大喷射系数。这种喷嘴结构能有效改善由于工作流体压力降低而造成的设备操作性能恶化，提高蒸汽喷射泵运行的稳定性。

Numerical Study of the Performance of Steam-jet Heat Pumps with an Innovative Nozzle Structure

By using a CFD (computational fluid dynamics) numerical simulation method a comparison study was conducted of the influence of a conventional nozzle structure and an innovative one on the operating performance of a steam-jet heat pump. An analysis was performed of the variation relationship between the flow-straightening tube length and the steam-jet factor. The results of the analysis indicate that under identical operating conditions the nozzle structure of a straightened flow can effectively enhance the steam jet factor of the jet ejector. Meanwhile, there exists an optimum length of the flow-straightening tube corresponding to the maximum jet factor. In addition, the above-mentioned nozzle structure is conducive to effectively preventing the deterioration of equipment performance caused by a reduction of operating fluid pressure, thus increasing the stability of the steam jet pump operation.