高温高压下平板预膜喷嘴初次雾化试验

张举星; 邸东; 张萍; 张腾; 颜应文; 李井华

doi:10.13224/j.cnki.jasp.20210047

高温高压下平板预膜喷嘴初次雾化试验

doi: 10.13224/j.cnki.jasp.20210047

南京航空航天大学能源与动力学院，南京 210016

基金项目: 国家科技重大专项（J2019-Ⅲ-0004-0047）

详细信息

作者简介:
张举星（1994-），男，硕士生，主要从事燃油雾化研究。E-mail：zhang-juxing@qq.com

通讯作者:
李井华（1981-），女，副教授、硕士生导师，博士，主要从事航空发动机燃烧技术研究。E-mail：lijinghua@nuaa.edu.cn

中图分类号: V213.2
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出版历程
- 收稿日期: 2021-01-30
- 刊出日期: 2022-01-28

Experiment on primary atomization of flat prefilm nozzle under high temperature and high pressure

College of Energy and Power Engineering， Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China

摘要

摘要: 为了深入探究预膜喷嘴燃油初次雾化机理，试验研究了高温高压条件下不同工况参数对平板预膜喷嘴初次雾化特性的影响规律。采用高速摄影可视化技术和马尔文粒度仪获取了预膜平板液膜厚度、液膜波动形态以及索泰尔平均直径（SMD）等雾化特性。利用图像后处理技术提取液膜厚度，试验结果表明：液膜厚度随进气压力、进气温度和进口韦伯数的增加而减小，随燃油流量增加而增加。采用本征正交分解（POD）对液膜波动主要模态时间系数进行快速傅里叶变换，结果表明在相同工况下，液膜波动频率表现出和液膜厚度变化相反的结果。当进气压力改变时，进口韦伯数保持不变，试验结果表明进气压力对最终液滴平均尺寸影响不明显，证实了进口韦伯数是更适合的表征燃油雾化效果的参数，在工况范围内液滴尺寸随着进口韦伯数的增加而减小。
- 预膜喷嘴 /
- 高温高压 /
- 初次雾化 /
- 雾化特性 /
- 本征正交分解
Abstract: In order to deeply explore the primary atomization mechanism of prefilm nozzle，the influences of different working parameters on the primary atomization characteristics of flat prefilm nozzle under high temperature and high pressure were experimentally studied.The atomization characteristics such as liquid film thickness，liquid film fluctuation pattern and Sauter mean diameter （SMD） of the prefilm plate were obtained by high-speed photography visualization technology and Malvern particle size analyzer.The film thickness of extraction solution was obtained by image post-processing technology.The experimental results showed that the film thickness decreased with the increase of inlet pressure，inlet temperature and inlet Weber number，and increased with the increase of fuel flow rate.Proper orthogonal decomposition （POD） was used to perform fast Fourier transform on the main mode time coefficients of liquid film fluctuation.The experimental results also showed that under the same working conditions，the fluctuation frequency of liquid film presented opposite result with the change of liquid film thickness.When the inlet pressure changed，the inlet Weber number kept unchanged.The experimental results showed that the inlet pressure had no obvious effect on the average size of the final droplet，demonstrating that the inlet Weber number is more suitable for characterizing the fuel atomization effect，and the droplet size decreases with the increase of inlet Weber number.
- prefilm nozzle /
- high temperature and high pressure /
- primary atomization /
- atomization characteristics /
- proper orthogonal decomposition

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参考文献(21)

[1]	GOSSELIN V,FERRET B,BAZILE R.Coupled study of film and spray on a basic annular prefiming airblast atomizer[R].Valence,Spain:ILASS-28th European Conference on Liquid Atomization and Spray Systems,2017.
[2]	刘殿春,董玉玺,尚守堂,等.航空发动机减排关键技术及应用[J].航空制造技术,2008（23）:32-37.
[3]	赵其寿,甘晓华.空气雾化喷嘴内液膜对雾化性能的作用[J].推进技术,1991（4）:42-48.
[4]	TAREQ M M,DAFSARI R A,JUNG S,et al.Effect of the physical properties of liquid and ALR on the spray characteristics of a pre-filming airblast nozzle[J].International Journal of Multiphase Flow,2020,126:.124-129.
[5]	LEFEBVRE A H,MILLER D.The development of an airblast atomizer for gas turbine application[R].Cranfield,UK:Colledge of Aeronautics Cranfield,Colledge of Aeronautics Report Aero 193,1966.
[6]	LEFEBVRE A H.Atomization and sprays[M].New York：Hemisphere Publishing Corporation,1988.
[7]	LEFEBVRE A H,BALLAL D R,BAHR D W.Gas turbine combustion:alternative fuels and emissions[J].Journal of Engineering for Gas Turbines and Power,2010,132（11）:443-511.
[8]	ROUDINI M,WOZNIAK G.Experimental investigation of spray characteristics of prefilming airblast atomizers[J].Journal of Applied Fluid Mechanics,2018,11（6）:1455-1469.
[9]	OKABE T,KATAGATA N,SAKAKI T,et al.Effect of prefilmer edge thickness on breakup phenomena of liquid film in prefilming airblast atomizer[R].Valencia,Spain:ILASS-28th European Conference on Liquid Atomization and Spray Systems,2017.
[10]	ROUDINI M,WOZNIAK G.Experimental investigation of spray characteristics of pre-filming airblast atomizers Ⅱ:influence of liquid properties[J].Journal of Applied Fluid Mechanics,2019,13（2）:679-691.
[11]	EBNER J.Modelling of shear-driven liquid wall films:effect of accelerated air flow on the film flow propagation[J].Progress in Computational Fluid Dynamics,2004,4（3）:183-190.
[12]	RIZKALLA A A,LEFEBVRE A H.The influence of air and liquid properties on airblast atomization[J].Journal of Fluids Engineering,1974,97（3）:316-320.
[13]	BECK J E,LEFEBVRE A H,KOBLISH T R.Liquid sheet disintegration by impinging air streams[J].Atomization and Sprays,1991,1（2）:155-170.
[14]	LEFEBVRE A H,KOBLISH T R,BECK J E.Airblast atomization at conditions of low air velocity[J].Journal of Propulsion and Power,2015,7（2）:207-212.
[15]	FERNANDEZ V G,BERTHOUMIE P,LAVERGNE G.Liquid sheet disintegration at high pressure:an experimental approach[J].Comptes Rendus Mecanique,2009,337（6/7）:481-491.
[16]	SATTELMAYER T,WITTIG S.Internal flow effects in prefilming airblast atomizers:mechanisms of atomization and droplet spectra[J].Journal of Engineering for Power,1986,108（3）:465-472.
[17]	LEFEBVRE A H.Airblast atomization[J].Progress in Energy and Combustion Science,1980,6（3）:233-261.
[18]	GEPPERTH S,MULLERARMIN,KOCH R,et al.Ligament and droplet characteristics in pre filming airblast atomization[R].Heidelberg,Germany:ICLASS Triennial International Conference on Liquid Atomization and Spray Systems,2012.
[19]	何昌升,刘云鹏,韩宗英,等.平板式预膜喷嘴初次雾化特性试验[J].航空动力学报,2020,35（3）:482-495.
[20]	GEPPERTH S,GUILDENBECHER D,KOCH R,et al.Prefilming primary atomization:experiments and modeling[R].Chennai,India:ILASS-Europe Conference on Liquid Atomization and Spray Systems,2010.
[21]	TAIRA K,BRUNTON S L,DAWSON S T M,et al.Modal analysis of fluid flows:an overview[J].AIAA Journal,2017,55（12）:4013-4041.