基于导流板结构的通海阀内部流阻和噪声特性数值模拟研究

Numerical Simulation of Internal Flow Resistance and Noise Characteristics of Sea Valve Based on Deflector Structure

舰船通常在压载舱内产生一定真空度,将海水通过通海管路系统注入或排出,实现舰船姿态控制,其中通海阀是连接船舶内部海水管路系统与外界的重要装置。但现有通海阀存在流阻系数大、噪声压级较高等问题。文章提出利用导流板结构降低通海阀内部流阻和噪声,采用Fluent软件和LMS Virtual.Lab软件对无导流板和添加不同尺寸导流板的通海阀内流场和噪声进行数值模拟计算,并研究通海阀内流场的速度、速度流线、压力、湍动能和噪声声压级的分布。最后,对数值模拟的结果进行对比分析,得出最优结果。结果表明:在通海阀内部添加导流板可以有效降低通海阀的压降,改善流场,降低流致噪声。同时对含不同厚度导流板的通海阀进行了对比分析,发现含8 mm厚导流板的通海阀性能相对最优。通过对通海阀不同导流板结构方案的计算结果进行对比,验证了改进措施的合理性,为通海阀内流道优化提供参考。

Ships usually produce a certain degree of vacuum in the ballast tank to inject or discharge seawater through the sea piping system to realize the ship attitude control,in which the sea valve is an important device connecting the internal seawater piping system of the ship and the outside world.However,the existing sea valve has some problems,such as a large flow resistance coefficient and high noise pressure level.This paper proposes to use the deflector structure to reduce the internal flow resistance and noise of the sea valve,using Fluent software and LMS virtual lab software to numerically simulate the flow field and noise in the sea valve without and with different sizes of the deflectors,and the distribution of velocity,velocity streamlines,pressure,turbulent kinetic energy and noise pressure level in the flow field of the sea valve is also studied.Finally,the results of the numerical simulation are compared and analyzed,and the optimal results are obtained.The results show that adding a deflector plate inside the sea valve can effectively reduce the pressure drop of the sea valve,improve the flow field,and reduce the flow-induced noise.At the same time,a comparative analysis of sea valves with different thicknesses of deflector plates is carried out,and it is found that the performance of the sea valve with 8 mm thick deflector plates is relatively optimal.Through the design of different structure deflectors in the sea valve and the simulation calculation,the rationality of the improvement measures is verified,and the reference is provided for the optimization of the sea valve.By comparing the calculation results of different deflector structure schemes of sea valves,the rationality of the improvement measures is verified,and reference is provided for the optimization of the inner flow path of the sea valve.