1. No. 63983 Unit of PLA, Wuxi, Jiangsu 214035, China; 2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;3. School of Transportation, Wuhan University of Technology, Wuhan, Hubei 430063, China
Abstract：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.
