混流式喷水推进泵叶轮强度计算和分析  

Strength calculation and analysis of impeller of mixed flow waterjet pump

作　　者：李留洋[1] 王永生[1] 魏应三[1] 付建[1] 靳栓宝[1] 

机构地区：[1]海军工程大学动力工程学院,湖北武汉430033

出　　处：《中南大学学报（自然科学版）》2014年第12期4438-4444,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51309229)~~

摘　　要：探索运用计算流体力学和有限元方法计算喷水推进泵叶轮静强度和动强度的方法。对国外某混流式喷水推进泵进行流场计算几何建模和叶轮强度计算有限元建模,采用计算流体力学方法计算和分析喷水推进泵的敞水性能,并与厂商提供数据进行比较以验证数值模型和计算方法的可信性;计算"喷水推进泵+流道+船体"的稳态流场,在此基础上计算喷水推进泵内的非定常流场,以获得叶轮表面的脉动压力载荷。提取叶轮表面的空间定常力和非定常力作为主要载荷,运用有限元方法对叶轮静强度和动强度进行计算和分析。对叶轮施加的全部载荷源有重力、离心力、流体静压力和动压力。计算结果表明:叶片的强度满足要求,叶片的最大变形量小于叶轮的叶顶间隙,叶片的根部出现应力集中,叶片最大变形出现在叶片顶端导边处。与静强度计算相比,动强度能更真实反映叶片表面的应力和应变。Computational fluid dynamic and finite element method were used to calculate waterjet impeller＇s static and dynamic strengths. The mixed flow waterjet pump model and finite element model were built, computational fluid dynamics was applied to analyze and calculate the performance of the mixed flow waterjet pump in order to verify the credibility of numerical model and calculation method, and the numerical result was compared with the manufacture＇s data; the unsteady field of the ＂waterjet pump＋ duct＋ hull＂ was calculated based on the steady one, from which the fluctuating pressure load of the blade surface was gotten. Secondly, the steady and unsteady surface forces of the impeller were extracted as the main load, the finite element method was applied to calculate and analyze the strength of the impeller. Gravity, a centrifugal force, the static and dynamic force were taken as the loads to impeller blades. The results show that the static strength of the impeller is acceptable, the largest deformation is located at the gap of the blade tip; the blade root exhibits stress concentration and the largest deformation appears at the blade tip near the loading edge. Comparison with the static strength, the dynamic strength can more accurately reflect the stress and strain conditions of the waterjet blade.

关 键 词：喷水推进器 叶轮 计算流体力学 有限元法 静强度 动强度 

分 类 号：U664.34[交通运输工程—船舶及航道工程]