混流式喷水推进器的性能试验与数值计算

为了综合检验SD-HGD266新型混流式喷水推进器的性能,进行了喷水推进器的台架性能试验、装船试航和数值计算.制作了实尺的喷水推进器样机进行台架性能试验,测量所得的3组数据集中性强.采用分块结构化网格离散数值模型计算域,选用SST湍流模型封闭雷诺平均的Navier-Stokes方程,采用SIMPLE算法对喷水推进器内流场进行数值模拟,计算得到的台架性能曲线与试验结果吻合较好.采用壁面积分法获取了装船喷水推进器的等转速推进特性曲线,通过与船阻力曲线叠加求交点进行航速预报,航速预报值与实船试航值最大偏差为2.68％.结果表明,该型喷水推进器达到了设计要求,数值计算可在喷水推进器的水力设计与性能分析中发挥重要作用,为喷水推进船最终达到预期航速奠定基础.

Performance test and numerical calculation of a mixed-flow waterjet

The performance of a new-style mixed-flow waterjet designated as SD-HGD266 was evaluated synthetically by means of a bench test,sailing trial,and numerical calculation.A full-scale prototype was produced and three groups of bench test data were shown to be similar to each other.The numerical model,which was meshed by multi-block structural grids,was calculated by solving Reynolds-averaged Navier-Stokes equations with a SIMPLE algorithm and SST turbulence model.The calculated performance agreed well with the bench test data.The waterjet propulsive characteristics expressed in the form of a constant-rotational-speed curve were obtained by using the direct-thrust-integration method.By superimposing the waterjet propulsive curve and the ship resistance curve,the ship speed could be determined according to their cross point.The deviation between the sailing trial data and the forecast ship speed is within 2.68%.It was concluded that the SD-HGD 266 waterjet had reached the design index.Computational fluid dynamics could play an important role in waterjet design and performance prediction,which lays a foundation for attaining anticipative ship speed.