长管路均压移水系统水力特性数值分析与试验研究

Numerical investigation and experiments on hydraulic characteristics of long pipeline pressure-balancing water conveying system

移水系统是船舶的重要系统,通过两水箱之间的移水,实现船舶的平稳运行。移水系统具有管路长、流量大的特点,系统往往会产生负压,通过将移水系统中两水箱排气孔相连组成均压移水系统,改善因移水产生的负压现象。本文通过仿真研究均压移水系统的水力特性,实验结果与仿真结果相符。通过仿真研究发现:随着系统初始压力P的增大,水箱1出口压力P和水箱2入口压力P以及泵入口压力会增大,有助于抑制气蚀的产生,但系统达到压力均衡的时间不变;随着气回路管路直径的增大,均压移水工况下两水箱压力差P-P减小,系统达到压力均衡的时间减小。

The water conveying system is an important system for ships,through conveyinging water between two water tanks to maintain stability. Because the water conveying system has the characteristics of long pipelines and large flow,negative pressure is inevitable. Connecting two water tank vents is used to form pressure-balancing water conveying system.This paper uses simulation to study the hydraulic characteristics of the pressure-balancing water conveying system, and the simulated results confirms well with experimental data. With the increasing initial pressure, outlet pressure of the tank 1, inlet pressure of the tank 2 and inlet pressure of the pump increase, which restrain the cavitation while taking the same time to balance. With the increasing air circuit pipe diameter, under pressure-balancing water conveying operation condition P-Pdecreases, while taking shorter time to balance.