对旋轴流式喷水推进器内部流动数值模拟与分析  

Numerical research on internal flow characteristics of contra-rotating water-jet propellers

作　　者：王雪豹 潘中永[1] 朱嘉炜 

机构地区：[1]江苏大学国家水泵工程中心,镇江212013

出　　处：《江苏科技大学学报（自然科学版）》2017年第5期605-611,共7页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(51209108);江苏省自然科学基金资助项目(BK20151342)

摘　　要：在喷水推进器运行时,不考虑改变喷口直径以及转向装置,只有转速以及航速变化对喷水推进器内部流动产生影响.基于计算流体力学方法,以对旋轴流式喷水推进器为对象,并在进水流道底部加入计算所需流场控制体.使用SST湍流模型,对喷水推进器进行相同转速不同航速、相同航速不同转速下的全流道数值模拟,得到首级叶轮进口处、首次级叶轮轴向间隙、次级叶轮出口处和喷口处截面速度与压力分布,从而分析比较推进泵转速以及推进器航速对喷水推进器内部流场的影响.结果表明:航行速度对喷水推进器内部尤其是首级叶轮前后流动产生显著影响,流道内速度变化较大;首级叶轮进口处底部速度最大且对后续流动有影响;在航速不变时,速度分布基本相同,仅在数值上有所变化,单独改变转速并未对喷水推进器内部流动产生较大影响,增加转速使得推进器内部流动趋于稳定;流体流经次级叶轮后,速度与压力分布具有规律性,推进器航速及喷泵转速均不会对其产生较大影响.Without considering the change of nozzle diameter and steering gear,only the change of ship speed and rotational speed affect the internal flow in the running of the water-jet propeller. The full flow passage numerical simulation of a contra-rotating axial flow water-jet propeller was performed at different ship speed and rotational speed based on CFD method. A control volume of calculated fluid flow region of water-jet is defined,and streamlines and pressure distribution were illustrated by using SST turbulent model. The effects of ship speed and rotational speed of the propeller on the internal flow field of the water jet propeller are analyzed and compared.Simulation results indicate that flow field in water-jet propeller particularly around front impeller is greatly affected by ship speed,fluid at speed,and the lower part of the front impeller has maximum speed. Velocity distribution are basically the same at different rotational speeds,but varies only in numerical value. The change of rotational speed does not have a great impact on the internal flow of water jet propulsion,while the increase of the rotational speed stabilize the internal flow of the propeller. The flow state is basically the same after the rear impeller for different ship speed and rotational speed,flow velocity at the outlet increases with the increasing of ship speed,and the velocity distribution is basically the same.

关 键 词：喷水推进器 航速 转速 全流道 内部流动 

分 类 号：O35[理学—流体力学]