摇摆条件下水平圆管内湍流压力脉动特性分析

Analysis of Turbulent Pressure Pulsation Characteristics in a Horizontal Pipeline under Rolling Conditions

一回路设备在设计时需考虑压力脉动的影响,而在海洋条件下,船体的运动会影响压力脉动,因此需要考虑海洋条件对压力脉动的影响。本文建立了海洋条件下的附加惯性力模型,通过自定义函数将该模型应用于Fluent求解器中,采用大涡数值模拟方法对细长管道进行数值计算,得到不同摇摆频率及雷诺数下的流场结果,并对监测点进行时域与频域分析,获取到监测点处的压力均方根及功率谱密度曲线。分析结果表明:在湍流充分发展区,压力脉动量相对于平均压力而言为小值;湍流压力脉动随着船体摇摆频率/雷诺数的增加而增加;随着雷诺数的增加,其对湍流压力脉动的影响减小,但摇摆条件增大了雷诺数对压力脉动的影响。

The influence of pressure pulsation should be considered in the design of primary circuit equipment,and in the ocean conditions,the movement of ship will affect the pressure pulsation,so it is necessary to consider the influence of ocean conditions on the pressure pulsation.In this paper,the additional inertial force under ocean conditions is established,and the model is applied to Fluent through User Defined Function.Large eddy simulation is used to numerically simulate the slender pipeline,and the flow field results under different rolling frequency and Reynolds number are obtained.The monitoring point is analyzed in time domain and frequency domain,the Root Mean Square value and Power Spectral Density curve are obtained.The results show that the pressure pulsation is small relative to the average pressure in the fully developed turbulent flow region.The turbulence pressure pulsation increases with the increase of rolling frequency/Reynolds number;With the increase of Reynolds number,its influence on turbulent pressure pulsation becomes smaller,but the rocking condition increases the influence of Reynolds number on pressure pulsation.