喷水推进三体船推力减额计算及分析

Abstract: To analyze the variation law of waterjet thrust deduction at different speeds，this study performed numerical simulation of the flow field of self-propelled trimaran by using UＲANS equations and VOF model and considering ship model's trim and sinkage． The body force method was used to model the effects of the real pump． The ship model's trim and sinkage increased under the self-propelled condition，with positive resistance increment fraction and negative jet thrust deduction fraction． The thrust deduction fraction is large at low speeds and decreases to be negative at high speeds． The momentum flux reduction method contributes to the negative thrust deduction fraction． At low speeds，the transom is wet，the jet flow is under water，and the magnitude of resistance increment fraction and jet thrust deduction fraction are large． The static pressure resistance increases as a result of ship geometry loss due to inlet and nozzle installation，contributing to a large resistance increment fraction at low speeds． At high speeds，the transom becomes dry，the jet flow is above water，and the magnitude of resistance increment fraction and jet thrust deduction fraction decreases． The attitude variation is the main reason for resistance increment at high speeds． The exit drag increases with increasing speed，which is the major part of jet thrust deduction． Keywords: waterjet propulsion; trimaran; thrust deduction; numerical simulation; resistance increment; jet thrust deduction
Computation and analysis of thrust deduction fraction of waterjet propelled trimaran
YI Wenbin，WANG Yongsheng，LIU Chengjiang，PENG Yunlong
( 1．Basic Department，Naval University of Engineering，Wuhan 430033，China; 2．College of Marine Power Engineering，Naval University of Engineering，Wuhan 430033，China; 3．Unit 92728，People's Liberation Army，Shanghai 200436，China)
第 40 卷第 3 期 2019Leabharlann Baidu年 3 月
哈尔滨工程大学学报 Journal of Harbin Engineering University
Vol．40 №．3 Mar．2019
喷水推进三体船推力减额计算及分析
易文彬1 ，王永生2 ，刘承江2 ，彭云龙3
( 1. 海军工程大学 基础部，湖北 武汉 430033; 2． 海军 工程大学 动 力工程学院，湖北 武汉 430033; 3． 92728 部队，上海 200436)
摘 要: 为分析喷水推进船推力减额在不同航速下的变化规律，基于非定常雷诺时均方程及 VOF 模型求解船舶粘 性流场，考虑船模纵倾角及升沉变化，采用体积力的方法代替泵的作用，数值模拟了三体船模喷水推进自航。自航 时船模纵倾角及吃水增加，阻力增额恒为正值，动量减额恒为负值。三体船在较低航速时有较大的推力减额，随着 航速提高推力减额变为负值。动量减额是高航速时推力减额为负的主要原因。低航速时艉板浸没在水中，喷口在 水面以下喷射水流，此时有较大的正阻力增额和较大的负动量减额，喷水推进器流道及喷口的安装使船体几何面 积有较大减小导致静压阻力增加，是低速时阻力增额的主要原因。高速时艉板由湿变干，喷口在水面以上喷射水 流，阻力增额及动量减额的绝对值减小，船模姿态变化是高速时阻力增额的主要原因。随着航速的提高，出口阻力 不断增大，构成了动量减额的主要成分。 关键词: 喷水推进; 三体船; 推力减额; 数值模拟; 阻力增额; 动量减额 DOI: 10. 11990 / jheu．201710063 网络出版地址: http: / / www．cnki．net / kcms / detail /23. 1390．u．20180828. 1749. 020．html 中图分类号: U661. 1 文献标志码: A 文章编号: 1006-7043( 2019) 03-572-07