泵喷推进器抗空化性能分析

为改善泵喷推进器抗空化性能以提高舰艇推进器空化初始航速,在验证所用方法可信性的基础上,运用三维反问题设计方法及计算流体力学方法对某排水型船进行泵喷推进器大样本优化设计。结果表明:泵喷推进器低压区的存在形式有3种,即大面积存在、局部存在、在叶片导边和导管进口外壁面呈线状分布;从尺寸选型、叶片负载分布、毂径比、入流角4个方面进行优化设计后,泵喷推进器抗空化性能明显提高。所总结的优化设计方法同样适用于泵喷推进器及导管桨等类似结构推进器的抗空化性能改善。

Anti-cavitation Performance Analysis of the Pumpjet

In order to improve the anti cavitation performance of the pumpjet propulsor (pjp) and increase its initial cavitation speed. On the basis of verifying the credibility of the method, the large sample pjp optimization design of a displacement vessel is carried out by using 3-D inverse problem design method and CFD method. Results show that existing forms of the low pressure zone can be systematically divided into 3 main types: large-scale presence, existing only in part, linear distribution along the leading edge of rotating blades or outside wall around the duct inlet. The anti cavitation performance of the pjp is obviously improved after the optimization design from four aspects including pjp size, blade load-distribution, boss diameter ratio and inflow angle. Methods of the article can also be used to improve anti-cavitation characteristics of similar propulsors such as pjp and duct propeller.