125SⅡ型喷水推进泵水动力性能的CFD预报研究

以71SII型喷水推进泵为母型,运用相似理论、CFD数值模拟及试验数据校核相结合的方法,预报了某型船拟使用的同系列的125SII型喷水推进泵的水动力性能。通过CFD分析不仅获得了125SII泵的各种性能,如流量、扬程、功率、效率等,而且还能反映泵内流场细节,便于模型的优化。本研究的意义在于,在没有125SII泵的几何图纸的情况下,运用相似理论从71SII泵的几何模型推得125SII泵的几何模型,据此在方案设计阶段可对新设计船进行快速性预报。结果表明,对由71SII泵的几何模型等比例放大得到的125SII泵模型进行CFD计算所得的不同转速下的功率与由71SII泵的试验P-n曲线通过相似换算所得的各转速下的功率,两者之间的相对误差在7%以内,这表明由71SII泵的几何模型等比例放大得到的125SII泵几何模型及相关的数值模拟是可信的。

Hydrodynamic Performance Prediction of KaMeWa 125SII Water-Jet Pump by CFD Analysis

This paper aims to predict the performance of 125SII water-jet pump which plans to install in a type of ship,based on the same serial products of 71SII pump by the Similarity Theory and in combination with CFD analysis and experimental data validation.The various performances of 125SII water-jet pump in terms of flow,head,power,efficiency,together with the details reflecting the flow field inside the pump were obtained by CFD analysis.The research is to highlight the feasibility of deriving the 125SII geometry model from the 71SII model as to rapid prediction of new design in the conceptual design stage,using the Similarity Theory,in the case of no design scheme of the pump.For deriving the model,71SII geometry model was enlarged and relevant numerical simulation was performed.The powers at various rotating speed obtained from 125SII model by enlarging 71SII model in geometric proportion and CFD calculation were compared with those given by similarity transformation of the experimental rev-power curve of 71SII water-jet pump.The result shows that the errors are less than 7%.It demonstrates that the numerical simulation of the 125SII geometry model obtained by enlarging the 71SII water-jet pump in geometric proportion is credible.