针对国内某型喷水推进快艇试航中航速未达设计值的问题，采用CFD数值实验的方法对该艇“船+喷水推进泵+进水流道+格栅”流场进行了数值计算，通过结果分析得到了该艇进水流道的设计缺陷。该研究从流道进水口、格栅、流道出口直径、背部曲线四个方面对进水流道进行了优化改进。优化后的系统“船+喷水推进泵+新进水流道+格栅”流场数值计算结果表明，进水流道优化后船的航速、推进效率等推进性能指标都得到了提高，使该艇在加装8根格栅的情况下能达到并超过设计航速。研究结果表明，喷水推进器进水流道及其格栅的性能会对船舶推进性能产生显著影响。%A type of domestic waterjet boat did not reach the design speed in the first sea tial. The flow field of “ship+pump+duct+grid” of this boat was calculated by CFD method, and then the defects of the duct was analyzed. After the optimization of the duct, grid, outlet diameter and ramp curve, the new system of the “ship+pump+duct+grid” was calculated and compared with the original system. The research result in-dicates that the propulsion performance of the improved duct, such as ship speed and propulsion efficiency, is increased, which makes the new waterjet propulsion system with 8 grids exceed the design ship speed. The result proves that the waterjet duct with grid has a great effect on the propulsion performance of ma-rine waterjet.
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