某艇喷水推进泵优化设计

针对某艇未达到预期航速的问题,采用三元反问题设计与正问题预报相结合的方法对喷泵进行改型设计.建立“喷泵+进水流道+艇体”的CFD计算模型,分析得到当前轴流喷泵存在效率偏低、设计点不匹配、流道流动损失大等问题.基于快速性要求、主机特性和设计水平,对喷泵进行设计参数选型.同时,基于一种叶片三元反设计方法,在多方案对比分析基础上,合理设置轴面形状、叶片数、叶片载荷、叶片积叠和加厚等控制参数,设计得到新型混流喷泵.数值计算结果表明,新喷泵在设计工况下水力效率可达90.0%,高效区流量范围宽,抗空化能力强,“艇-机-泵”匹配良好.喷泵装艇试航结果表明,该艇航速提高了约13%,达到了预期快速性设计要求,验证了喷泵三元反设计方法的准确性.

Optimized design of waterjet pump for boat

Aiming at the problem that a submarine did not reach the expected speed, the modification design of the waterjet propulsion pump was studied by using the 3D inverse design and forward prediction method. Firstly, the CFD model of ″waterjet propulsion pump + inlet channel + hull″ was established, and the problems of low efficiency, mismatch of design points and large flow loss of inlet channel were analyzed. After that based on the requirement of rapidity, the characteristics of the prime mover and the design level, the design parameters of the waterjet propulsion pump were selected. Furthermore, based on a 3D inverse design method of blades, a new type of mixed-flow waterjet pump was designed by reasonably setting the control parameters such as the shape of meridian plane, the number of blades, the load of blades, the stacking and thickening of blades based on the comparative analysis of multiple schemes. The numerical prediction results show that under the design condition, the hydraulic efficiency of the new waterjet pump can reach 90.0%, the flow range of high efficiency area is wide, the anti-cavitation ability is strong, and the ″boat-machine-pump″ matches well. The test results show that the speed of the waterjet pump is increased by about 13%, and the expected rapidity is achieved, which verifies the accuracy of the 3D inverse design method.