船舶燃气轮机进气过滤部件内含盐液滴二次夹带，严重影响进气品质以及燃气轮机的安全运行。本文采用气-液两相流数值模拟方法并耦合欧拉壁面液膜模型，研究了船用双钩惯性级滤清器内含盐液滴二次夹带形成与作用机理及海洋环境下不同进气流速对含盐液滴二次夹带的影响规律，对比分析了相较于纯水液滴，含盐液滴物性参数改变对惯性级内液膜分布及液滴二次夹带的影响。结果表明：相较于纯水液滴，惯性级滤清器对含盐液滴的过滤效果更好，过滤效率相对提升20.6%。这是由于液滴含盐后密度增加，液滴更容易受惯性力作用撞击壁面形成壁膜，并且含盐液滴表面张力和粘性更大，形成的壁膜更稳定，更不易发生二次夹带；惯性级内含盐液滴二次夹带的主要形式为发生在疏水钩钩峰处的液膜剥离；随着进气流速由3 m/s增大至12 m/s，疏水钩处液膜厚度先增后减，进气流速大于6 m/s时发生二次夹带，液滴从液膜上剥落重新进入流场并撞击疏水钩后的壁面，叶片上表面尾缘附近及下表面迎风侧附近液膜厚度明显增大。滤清器内液膜剥离的临界气流速度为14.6 m/s。

Saline droplet re-entrainment in marine intake filtration components seriously affects the gas intake quality and the safe operation of gas turbines. Given the above problem, this paper adopts the numerical simulation method of gas-liquid two-phase flow, coupled with the Eulerian wall film (EWF) model to investigate the mechanism of saline droplet re-entrainment and the effects of different inlet air velocities in real marine environment on re-entrainment in marine double hook inertial stage filter, and the influence of changes in physical properties of saline droplets, on re-entrainment was examined. The results show that, compared to pure water droplets, the inertial stage filter is more effective on separating saline droplets, and the separation efficiency increases 20.6% relatively, which is due to the increased density of saline droplets makes them more susceptible to inertial forces, causing them to collide with the wall and form liquid film. Additionally, the higher surface tension coefficient and dynamic viscosity of saline droplets lead to more stable liquid film, reducing the likelihood of re-entrainment. The primary form of saline droplets re-entrainment in inertial stage filter is film stripping at the peak of draining hooks. As the inlet air velocity increases from 3 m/s to 12m/s, the liquid film thickness at draining hooks increases first and then decreases. Re-entrainment occurs when the inlet air velocity exceeds 6 m/s, some droplets fall off from the liquid film and re-enter the flow field, so the thickness of the liquid film near the trailing edge of the upper surface of the blade and near the windward side of the lower surface increases significantly. The critical airflow for film stripping velocity is 14.6 m/s.

TK221

国家自然科学基金项目;船舶动力基础科研项目