Influence Mechanism of Droplet Re-Entrainment in Wire Mesh Filter for Marine Gas Turbine

doi:10.16183/j.cnki.jsjtu.2024.033

Abstract

Abstract:

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 20 μm, the filter fails.

Key words: gas turbine intake system, wire mesh filter, droplet re-entrainment, liquid film distribution, film stripping

CLC Number:

U664.1

FEI Yunda, LIU Yanming, WANG Jianhua, SUN Shijun. Influence Mechanism of Droplet Re-Entrainment in Wire Mesh Filter for Marine Gas Turbine[J]. Journal of Shanghai Jiao Tong University, 2025, 59(12): 1837-1846.

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References 16

[1]	KURZKE J. Effects of inlet flow distortion on the performance of aircraft gas turbines[J]. Journal of Engineering for Gas Turbines and Power, 2008, 130(4): 041201. doi: 10.1115/1.2901190 URL
[2]	张李伟, 孙海鸥, 韩蕴蕾. 船用丝网除雾器分离效率计算[J]. 船舶工程, 2007 (5): 1-4.
	ZHANG Liwei, SUN Hai’ou, HAN Yunlei. Calculation of separation efficiency to marine wire-mesh demister[J]. Ship Engineering, 2007 (5): 1-4.
[3]	AZZOPARDI B J, SANAULLAH K S. Re-entrainment in wave-plate mist eliminators[J]. Chemical Engineering Science, 2002, 57(17): 3557-3563. doi: 10.1016/S0009-2509(02)00270-1 URL
[4]	PUNEKAR H, INGLE R, CAO J, et al. Modeling of particle wall interaction and film transport using eulerian wall film model[C]∥ ASME 2014 Gas Turbine India Conference. New Delhi, India: ASME, 2014: V001T03A006.
[5]	KOUHIKAMALI R, ABADI S, HASSANI M. Numerical study of performance of wire mesh mist eliminator[J]. Applied Thermal Engineering, 2014, 67(1/2): 214-222. doi: 10.1016/j.applthermaleng.2014.02.073 URL
[6]	SUN H, BU S, LUAN Y. A high-precision method for calculating the pressure drop across wire mesh filters[J]. Chemical Engineering Science, 2015, 127: 143-150. doi: 10.1016/j.ces.2015.01.023 URL
[7]	HALA A, ANDREA, GIORGIO M, et al. Eulerian-Lagrangian modeling and computational fluid dynamics simulation of wire mesh demisters in MSF plants[J]. Desalination, 2016, 385: 148-157. doi: 10.1016/j.desal.2016.02.019 URL
[8]	YAO Y, PAVLENKO A N, VOLODIN O A. Effects of layers and holes on performance of wire mesh packing[J]. Journal of Engineering Thermophysics, 2015, 24: 222-236. doi: 10.1134/S1810232815030042 URL
[9]	LIU Y, YU D, JIANG J, et al. Experimental and numerical evaluation of the performance of a novel compound demister[J]. Desalination, 2017, 409: 115-127. doi: 10.1016/j.desal.2017.01.022 URL
[10]	刘晓一, 田瑞峰, 黄亚军, 等. 丝网分离器水滴撞击水膜的机理研究[J]. 原子能科学技术, 2014, 48(6): 1009-1014. doi: 10.7538/yzk.2014.48.06.1009
	LIU Xiaoyi, TIAN Ruifeng, HUANG Yajun, et al. Study on mechanism of water droplet impinging on water film in wire mesh demister[J]. Atomic Energy Science and Technology, 2014, 48(6): 1009-1014. doi: 10.7538/yzk.2014.48.06.1009
[11]	卜诗. 多层丝网空气过滤器阻力特性影响因素研究[D]. 哈尔滨: 哈尔滨工程大学, 2014.
	BU Shi. Research on the influence factors on the resistance characteristics of multi-layer wire mesh air filter[D]. Harbin: Harbin Engineering University, 2014.
[12]	刘鹏飞. 金属丝网滤清器阻力特性预测方法研究[D]. 哈尔滨: 哈尔滨工程大学, 2013.
	LIU Pengfei. Research on prediction method of wire mesh filter resistance characteristic[D]. Harbin: Harbin Engineering University, 2013.
[13]	VENKATESAN G, KULASEKHARAN N, INIYAN S. Influence of turbulence models on the performance prediction of flow through curved vane demisters[J]. Desalination, 2013, 329: 19-28. doi: 10.1016/j.desal.2013.09.001 URL
[14]	RAFEE R, RAHIMZADEH H, AHMADI G. Numerical simulations of airflow and droplet transport in a wave-plate mist eliminator[J]. Chemical Engineering Research & Design, 2010, 88(10): 1393-1404.
[15]	GALLETTI C, BRUNAZZI E, TOGNOTTI L. A numerical model for gas flow and droplet motion in wave-plate mist eliminators with drainage channels[J]. Chemical Engineering Science, 2008, 63(23): 5639-5652. doi: 10.1016/j.ces.2008.08.013 URL
[16]	BRANDRISS M E, O’NEIL J R, EDLUND M B, et al. Multi-dimensional modeling of thin liquid films and spray-wall interactions resulting from impinging sprays[J]. International Journal of Heat and Mass Transfer, 1998, 41(20): 3037-3054. doi: 10.1016/S0017-9310(98)00054-4 URL

方案	工况
方案	v/(m·s^-1)	d/μm
case1	3	5
case2	5	5
case3	7	5
case4	9	5
case5	7	10
case6	7	15
case7	7	20