针对国际拖曳水池会议(ITTC)推荐的动量流量法需要确定喷水推进器流道进流面的问题，提出了简单实用的基于流线法的进流面获取方法，并采用MATLAB语言开发成程序，使这一过程大大简化，提高了效率.在此基础上，采用稳态多重参考系(MRF)模型，通过求解RANS方程对不同转数下喷水推进器的性能进行了数值计算与分析.研究结果表明：该方法可以准确获得进流面形状，并可给出进流面形状的参数化表达；进流面形状、泵前进口面速度分布以及唇部流动分离点位置都随转速变化而变化.所提出方法具有一定的实用性，可用于喷水推进器性能的预报.
The momentum flux method recommended by the International Towing Tank Conference (ITTC) needs to determine the capture area of waterjet. A simple and practical method to obtain the capture area based on streamline method is proposed. MATLAB is adopted to greatly simplify the post-processing of obtaining the capture area and enhances the efficiency. On this basis, by solving the RANS equation and applying the steady multi-reference frame (MRF) model, the performance of the waterjet is numerical calculated and analyzed at different rotational speeds. It is found that the method can accurately get the shape of the capture area, and the parametric expressions of the capture area are given. The shape of the capture area, the velocity distribution of the pump intake and the position of the separation point of the lip flow all change with the rotational speed. The proposed method is practical and can be used to predict the performance of the waterjet.
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