尺度效应对喷水推进系统进出口流场及推力影响分析  

Analysis on influence of scale effect on the fluid filed at inlet and outlet and thrust of water jet propulsion

作　　者：汲国瑞 刘雪琴 尹晓辉[1,2] 刘建国 JI Guo-rui;LIU Xue-qin;YIN Xiao-hui;LIU Jian-guo(Marine Design and Research Institute of China,Shanghai 200011,China;Science and Technology on Water Jet Propulsion Laboratory,Shanghai 200011,China)

机构地区：[1]中国船舶及海洋工程设计研究院,上海200011 [2]喷水推进技术重点实验室,上海200011

出　　处：《舰船科学技术》2021年第6期53-56,共4页Ship Science and Technology

摘　　要：本文以喷水推进船为研究对象,采用数值计算方法计算不同缩尺比喷水推进系统的水动力性能。通过比较不同缩尺比喷水推进进出口的速度场和出口不均匀度,认为在缩尺比较大时,缩尺比对喷水推进进出口速度场影响较小。将模型尺度推力换算成实型推力时,引入无因次系数C,该系数会随着缩尺比的增加而不断增加。通过计算不同缩尺比喷水推进泵的C值,可以拟合出一条曲线,通过拟合出的曲线可以求出实泵的C值,最终可以将模型喷泵产生的推力通过相似换算得到实泵产生的推力。这对喷水推进装置的设计和喷水推进船的快速性预报具有重要的指导意义。A water jet propulsion ship is studied in this paper,adopting numerical calculation method to solve its hydrodynamic performance of different similar ratio.It is found that similar ratio has little effect on the inlet and outlet velocity field of water jet propulsion ship,by comparing the velocity field of different similar ratio water jet propulsion ship.A dimensionless coefficient C is applied,when model pump thrust is converted into the actual pump thrust.And C increases with the increase of similar ratio.A curve can be fitted according to different C,then C of actual pump can be gotten.Finnally,the model pump thrust is converted into actual pump,which has important guiding signifiance for pump design and water jet propulsion ship velocity forcasting.

关 键 词：尺度效应 喷水推进 进口流道 相似换算 

分 类 号：TH137[机械工程—机械制造及自动化]