摘要
船舶燃气轮机进气过滤部件内的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,对此研究了网垫级内液滴二次夹带形成及影响机理,对比分析了不同进气流速、不同液滴直径对网丝表面液膜厚度以及二次夹带质量的影响规律.结果表明:受速度梯度以及惯性的影响,进口液滴趋于先在丝网段上游沉积形成液膜;液膜剥离是船舶行驶工况下二次夹带的主要形式,其发生的临界进气流速在4~4.5 m/s;相邻丝网层紧凑型排列对通过气流起到加速作用,加剧了对液膜的剪切,使得液膜剥离质量升高,在网垫级加工中应尽量避免;随着进气流速的增大,液膜厚度整体减小,液膜剥离质量整体增大;液滴直径的增大使得孔隙易于堵塞且局部膜厚增大,最终导致液膜厚度减小,液膜剥离质量升高,严重影响过滤效率,在液滴直径为20μm时过滤器失效.
The re-entrainment of droplets in the inlet filtration components of marine gas turbines severely affects the gas intake quality and the safe operation of gas turbines.To address this issue,the formation and influence mechanisms of droplet re-entrainment in the wire mesh filter were studied,and a comparative analysis was conducted on the effects of different inlet air velocities and droplet diameters on the liquid film thickness on the surface of the mesh and the mass of re-entrainment.The results show that incoming droplets tend to deposit upstream of the mesh segment and form a liquid film due to velocity gradients and inertia effects.Liquid film stripping is the main form of re-entrainment under marine operating conditions,occurring at a critical inlet air velocity between 4 and 4.5 m/s.The compact arrangement of adjacent wire mesh layers accelerates the airflow,and intensifies shear effect on the liquid film,which in turn increases the stripping film mass.This should be avoided during mesh fabrication.With the increase of the inlet air velocity,the overall thickness of the liquid film decreases,while the mass of stripping film increases.The increase in droplet diameter leads to easier blockage of the mesh pores and the local increase in film thickness,eventually leading to the overall decrease in film thickness but the increase in stripping film mass,which seriously affects the filtration efficiency.At a droplet diameter of 20μm,the filter fails.
作者
费运达
刘艳明
王建华
孙士珺
FEI Yunda;LIU Yanming;WANG Jianhua;SUN Shijun(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;Systems Engineering Research Institute of China State Shipbuilding Cooperation,Beijing 100094,China)
出处
《上海交通大学学报》
北大核心
2025年第12期1837-1846,共10页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金(12372228)资助项目。
关键词
燃气轮机进气系统
网垫级滤清器
二次夹带
液膜分布
液膜剥离
gas turbine intake system
wire mesh filter
droplet re-entrainment
liquid film distribution
film stripping
