Effect of film cooling jet on deposition of micro particles on blades
-
摘要: 针对微细颗粒在涡轮叶片表面的沉积问题,采用EI-Batsh沉积模型对涡轮叶片表面微细颗粒沉积情况进行数值仿真,探究压力面冷却射流对颗粒沉积特性的影响。研究表明:沉积主要发生于叶片前缘与压力面,且沉积率随着粒径的增大不断增大,但粒径增大到17 μm后沉积率增加幅度开始变小。存在冷却射流时,射流可以通过吹离和卷吸作用影响小粒径颗粒的碰撞率,从而影响到沉积率,但对大粒径颗粒碰撞率基本不存在影响。射流还可以通过冷却壁面降低颗粒黏附率,进而影响沉积率,且大粒径颗粒所受影响更明显;改变吹风比后,颗粒沉积率随吹风比增加总体上呈现出先减小后增大的趋势。
-
关键词:
- 涡轮叶片 /
- 沉积特性 /
- 离散项模型 /
- EI-Batsh沉积模型 /
- 沉积率
Abstract: In view of the deposition of micro particles on the surface of turbine blades,the EI-Batsh deposition model was used to simulate the deposition of micro particles on the surface of turbine blades to explore the effect of pressure surface cooling jets on particle deposition characteristics.Results showed that,particles were mainly deposited on the leading edge and pressure surface of the blade,and the deposition rate increased with the particle diameter.However,when the particle diameter increased to 17 μm,the increase of deposition rate began to decrease.When there was a cooling jet,the collision rate of small particles can be affected by off and entrainment,thereby affecting the deposition rate.But there was basically no impact on the collision rate of large particles.The jet can also reduce the particle adhesion rate by cooling the wall surface,and affect the deposition rate in this way.The large-size particles were affected more obviously.After changing the blowing ratio,the particle deposition rate decreased first and then increased as the blowing ratio increased. -
[1] DRING R P,CASPAR J R,SUO M.Particle trajectories in turbine cascades[J].Journal of Energy,1979,3(3):161-166. [2] BRACH R M,DUNN P F.A mathematical model of the impact and adhesion of microsphers[J].Aerosol Science and Technology,1992,16(1):51-64. [3] SREEDHARAN S S,TAFTI D K.Composition dependent model for the prediction of syngas ash deposition in turbine gas hotpath[J].International Journal of Heat and Fluid Flow,2011,32(1):201-211. [4] SINGH S,TAFTI D.Particle deposition model for particulate flows at high temperatures in gas turbine components[J].International Journal of Heat and Fluid Flow,2015,52:72-83. [5] HANSEN L A.Melting and sintering of ashes[D].Copenhagen,Denmark: Technical University of Denmark,1998. [6] BARKER B,CASSDAY B,SHANKARA P,et al.Coal ash deposition on nozzle guide vanes:Part Ⅱ computational modeling[J].Journal of Turbomachinery,2013,135(1):011015.1-011015.9. [7] EI-BATSH H.Modeling particle deposition on compressor and turbine blade surfaces[D].Vienna,Austria:Vienna University of Technology,2001. [8] AI W,FLETCHER T H.Computational analysis of conjugate heat transfer and particulate deposition on a high pressure turbine vane[J].Journal of Turbomachinery,2012,134(4):041020.1-041020.12. [9] AI W,MURRAY N,FLETCHER T H,et al.Deposition near film cooling holes on a high pressure turbine vane[J].Journal of Turbomachinery,2012,134(4):041013.1-041013.11. [10] 周君辉,张靖周.气膜孔附近粒子沉积特性的数值研究[J].航空动力学报,2014,29(9):2166-2173. [11] HAMED A,TABAKOFF W G,WENGLARZ R V.Erosion and deposition in turbomachinery[J].Journal of Propulsion and Power,2006,22(2):350-360. [12] ROZATI A,TAFTI D K,SREEDHARAN S S.Effects of syngas ash particle size on deposition and erosion of a film cooled leading edge[J].Journal of Turbomachinery,2011,133(1):011010.1-011010.9. [13] 裴钰.燃气轮机涡轮叶片表面污染物沉积模型研究[D].天津:中国民航大学,2016. [14] WENGLARZ R A,FOX R G J.Physical aspects of deposition from coal water fuels under gas turbine conditions[J].Journal of Engineering for Gas Turbines and Power,1989,112(1):9-14. [15] 徐致远.涡轮端壁处颗粒物沉积的数值研究[D].天津:中国民航大学,2018. [16] 赵静宇.颗粒在平板气膜冷却壁面沉积机理研究[D].西安:西北工业大学,2017. [17] FORSYTH P R,GILLESPIE D,MCGILVRAY M.Development and applications of a coupled particle deposition-dynamic mesh morphing approach for the nμmerical simulation of gas turbine flows[J].Journal of Engineering for Gas Turbines and Power,2018,140(2):022603.1-026603.11. [18] 蔡柳溪.燃气透平叶片表面颗粒沉积特性数值研究进展[J].工程热物理学报,2020,41(2):342-344. [19] SOLTANI M,AHMADI G.On particle adhesion and removal mechanisms in turbulent flows[J].Journal of Adhesion Science and Technology,1994,8(7):763-785.
点击查看大图
计量
- 文章访问数: 70
- HTML浏览量: 13
- PDF量: 43
- 被引次数: 0