摘要
喷水推进压力脉动是与其振动噪声密切相关的水动力性能,主要是由转子与定子相互作用引起的。压力脉动的数值模拟主要采用非稳态方法,计算消耗巨大。为此,将谐波平衡法引入压力脉动的数值计算,以某后置导叶型喷水推进泵为对象,通过与瞬态数值模拟结果相比较,发现谐波平衡法适用于喷水推进泵非定常压力脉动的数值计算。当谐波平衡法的阶数n达到5时,计算所得的流场、脉动力与瞬态计算结果一致。数值计算工作量相当于2n+1个稳态计算量,远小于非稳态计算的工作量。
Pressure fluctuation is a key hydrodynamic feature for a waterjet pump. The blade passing frequency(BPF) of the rotor-stator interaction and its harmonics are of great importance since they dominate the pressure fluctuation. For simulating such an unsteadiness, the normal time-domain methods are always time consuming since the time step size are limited and huge amount of time steps are required. In the present paper, a harmonic balance method is introduced for such an unsteady flow. A numerical simulation is performed for a waterjet pump with a rear stator by the method. The numerical results show that the unsteady force as well as the transient flow field predicted by the harmonic balance method are close to the unsteady method when the number of harmonics, n, is larger than 5. The computation cost is about 2n+1 steady simulation and less than the traditional time stepping method.
作者
张伟
陈晓明
陈建平
王宗龙
朱兵
ZHANG Wei;CHEN Xiaoming;CHEN Jianping;WANG Zonglong;ZHU Bing(Science and Technology on Water-jet Propulsion Laboratory,Marine Design and Research Institute of China,Shanghai 201100,China;Marine Design and Research Institute of China,Shanghai 201100,China;School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《中国造船》
EI
CSCD
北大核心
2022年第6期145-151,共7页
Shipbuilding of China
基金
国家自然科学基金面上项目(12272357)。
关键词
喷水推进
压力脉动
谐波平衡法
waterjet
pressure fluctuation
harmonic balance
