长径比对预旋孔流动特性影响的数值研究

推进技术 ›› 2013, Vol. 34 ›› Issue (5): 644-650.

长径比对预旋孔流动特性影响的数值研究

刘高文,张林,务卫涛,冯青

西北工业大学动力与能源学院,陕西西安 710072;西北工业大学动力与能源学院,陕西西安 710072;西北工业大学动力与能源学院,陕西西安 710072;西北工业大学动力与能源学院,陕西西安 710072

发布日期:2021-08-15
作者简介:刘高文(1974—),男,博士,副教授,研究领域为发动机空气系统和旋转盘腔中的流动传热。 E-mail:gwliu@nwpu.edu.cn

Numerical Simulations on the Flow Characteristics of the Pre-Swirl Nozzles with Different Length-to-Diameter Ratios

School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China;School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China;School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China;School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China

Published:2021-08-15

摘要/Abstract

摘要： 采用数值方法研究了长径比和压比对预旋孔流动特性的影响,所研究的预旋角度为30°,长径比范围为1～5,压比范围为1.1～1.9。计算获得了出气角度、出气面积、出气速度及其周向分量,流量系数和预旋效率等参数随压比和长径比的变化。对长径比1.75和4的预旋孔流量系数进行了实验测量。结果表明预旋效率是一个可以综合反映预旋喷嘴气流偏转、加速和流动损失等主要性能的无量纲参数。预旋效率随长径比的增加先显著增加后微弱减小,最佳长径比为2.5左右。长径比小于2时由于出气角度和实际出气面积都明显偏离设计值,预旋效率显著偏低,在设计中应避免出现。 

关键词: 预旋;预旋喷嘴;预旋孔;预旋效率;流量系数 

Abstract: The effects of length-to-diameter ratio and pressure ratio on the flow characteristics of a pre-swirl nozzle were numerically investigated to promote the temperature drop performance in a pre-swirl system. The investigated nozzle angle is 30°,length-to-diameter ratio range is 1~5, and pressure ratio range is 1.1~1.9. Data of such parameters as exit flow angle, actual flow area, velocity magnitude and tangential velocity, discharge coefficient and pre-swirl effectiveness were obtained and analyzed. Discharge coefficients of pre-swirl nozzle with length-to-diameter ratio equal to 1.75and 4, respectively,were measured. It is found that pre-swirl effectiveness is a non-dimensional parameter that can reflect the integrated performance of a pre-swirl nozzle like flow deflection, acceleration, and pressure loss, etc. Results show that the pre-swirl effectiveness of a pre-swirl nozzle rises dramatically and then down slightly with the increase of length-to-diameter ratio, with an optimized value of 2.5. Any case of length-to-diameter ratio smaller than 2should be avoided in a real engine pre-swirl nozzle design, because the exit flow angle and actual flow area departure from its design value remarkably. 

Key words: Pre-swirl; Pre-swirl nozzle; Pre-swirl hole; Pre-swirl effectiveness; Discharge coefficient

刘高文,张林,务卫涛,冯青. 长径比对预旋孔流动特性影响的数值研究[J]. 推进技术, 2013, 34(5): 644-650.

LIU Gao-wen, ZHANG Lin, WU Wei-tao, FENG Qing. Numerical Simulations on the Flow Characteristics of the Pre-Swirl Nozzles with Different Length-to-Diameter Ratios[J]. Journal of Propulsion Technology, 2013, 34(5): 644-650.

参考文献

[1] Meierhofer B.An Investigation of Pre-Swirl Cooling Airflow to a Turbine Disc by Measuring the Air Temperature in the Rotating Channels[R].ASME 81-GT-132.
[2] Bricaud C, Gei T,Dullenkopf K.et al.Measurement and Analysis of Aerodynamic and Thermodynamic Losses in Pre-Swirl System Arrangements[R].ASME 2007-GT-27191.
[3] Dittman M.Discharge Coefficients of a Pre-Swirl System in Secondary Air System[R].ASME 2001-GT-0122.
[4] Chew J W.Per-Swirled Cooling Air Delivery System Performance[R].ASME 2005-GT-68323.
[5] Javiya U.A Comparative Study of Cascade Vanes and Drilled Nozzle Design for Pre-Swirl[R].ASME 2011-GT-46006.
[6] Karnahl J.CFD Simulations of Flow and Heat Transfer in a Pre-Swirl System:Influence of Rotating-Stationary Domain Interface[R].ASME 2011-GT-45085.
[7] 王锁芳, 朱强华, 张羽,等,预旋进气位置对转静盘腔换热影响的数值研究[J].航空动力学报, 2007,22(8):1227-1232.
[8] 罗翔, 徐国强, 陶智,等.进气角度对旋转盘冷却效果的影响[J].推进技术,2007,8(3):240-243.(LUO Xiang,XU Guo-qiang,TAO Zhi,et al.Cooling Effectiveness in a Rotor-Stator System with Different Pre-Swirl Angles[J].Journal of Propulsion Technology,2007,8(3):240-243.)
[9] 冶萍,张靖周.有预旋进气转静盘腔中的流动和换热特性数值研究[J].航空动力报, 2004,9(3):370-374.
[10] 丁水汀,陶智国,徐国强,等.带进气预旋的旋转空腔平均换热特性研究[J].航空动力学报,1998,3(3):277-280.
[11] 何振威,冯青,刘松龄,等.带盖板预旋系统的流动模拟实验研究[J],推进技术,2011,2(5):654-657.(HE Zhen-wei,FENG Qing,LIU Song-ling,et al.Experiment of the Flow in a Cover-Plate Pre-Swirl System[J].Journal of Propulsion Technology,2011,2(5):654-657.)
[12] 朱晓华,刘高文,刘松龄,等.带盖板的预旋系统降温和压力损失数值研究[J].航空动力学报,2010,5(11):2498-2506.