离心压气机自循环机匣处理扩稳机理分析
收稿日期: 2013-12-30
修回日期: 2014-04-01
网络出版日期: 2014-04-16
基金资助
国家自然科学基金(51206163)
Mechanism Analysis of Stability Enhancement by Self-recirculating Casing Treatment for Centrifugal Compressor
Received date: 2013-12-30
Revised date: 2014-04-01
Online published: 2014-04-16
Supported by
National Natural Science Foundation of China (51206163)
自循环机匣处理能大幅提高离心压气机的稳定工作裕度,其回流的抽吸和二次注入具有明显的宏观流动特征.将主流按与二次注入流是否发生掺混分为掺混主流和无掺混主流两股流体,并将离心叶轮按导风轮和工作轮两个压缩部件对自循环机匣处理的作用机理分别进行了分析.数值模拟结果表明:回流流量、回流二次注入的预旋角以及二次注入流占用主流道流通面积的大小是自循环机匣处理扩稳的3个重要因素;二次注入流通过直接掺混和挤占流道使主流收缩加速两种方式减小了导风轮的进气攻角;机匣处理同时加大了导风轮和工作轮尖部的流通能力,抑制了导风轮的叶尖分离,改变了导风轮展向的载荷分布,在减小导风轮尖部载荷的同时提高了工作轮叶尖的做功能力,从而延缓了流动失稳的发生.
康剑雄 , 黄国平 , 朱俊强 , 温殿忠 . 离心压气机自循环机匣处理扩稳机理分析[J]. 航空学报, 2014 , 35(12) : 3264 -3272 . DOI: 10.7527/S1000-6893.2014.0037
Self-recirculating casing treatment is known to increase the stable operating range of centrifugal compressors. Suction and reinjection of backflow have obvious macro-flow features. The main flow can be considered as two parts. One is mixed with the backflow, and the other is not. The rotor can be seen as inducer and impeller. The casing treatment has different effects on them. Flow field simulation is carried to show that the quantity, the area, and the reinjected angle of backflow are three important factors. It is found that the reinjection of backflow can decrease angle of attack by mixing and accelerating the main flow. The casing treatment can enhance flow capacity, take away tip separation and alter span loading distribution of the rotor. With casing treatment, tip loading is decreased for inducer and the ability to do work is improved for tip region of impeller. Thus, the onset of flow instability is delayed.
Key words： self-recirculating; casing treatment; suction; injection; stall margin; centrifugal compressor
[1] Shabbir A, Adamczyk J J. Flow mechanism for stall margin improvement due to circumferential casing grooves on axial compressors[J]. Journal of Turbomachinery, 2005, 127(4): 708-717.
[2] Korting P, Beacher B F. Improved compressor performance using recessed clearance (trenches)[J]. Journal of Propulsion and Power, 1989, 5(4): 469-475.
[3] Wilke I, Kau H P. A numerical investigation of the flow mechanisms in a high pressure compressor front stage with axial slots[J]. Journal of Turbomachinery, 2004, 126(3): 339-349.
[4] Zhu J, Chu W L. The effects of bend skewed groove casing treatment on performance and flow field near endwall of an axial compressor, AIAA-2005-0809[R].Reston: AIAA, 2005.
[5] Lu X G, Chu W L, Zhu J Q, et al. Analysis of the coupled flow through axial skewed slots casing treatment and rotor passage[J]. Journal of Engineering Thermophysics, 2006, 27(2): 226-228. (in Chinese)卢新根, 楚武利, 朱俊强, 等. 轴向斜缝机匣处理与转子通道之间耦合流动分析[J]. 工程热物理学报, 2006, 27(2): 226-228.
[6] Azimian A R, Elder R L, McKenzie A B. Application of recess vaned casing treatment to axial flow fans[J]. Journal of Turbomachinery, 1990, 112(1): 145-150.
[7] Greitzer E M, Nikkanen J P, Joslyn H D, et al. A fundamental criterion for the application of rotor casing treatment[J]. Journal of Fluids Engineering, 1979, 101(2): 237-243.
[8] Wang T, Xu W, Gu C G, et al. A new type of self-adaptive casing treatment for a centrifugal compressor[C]//ASME Turbo Expo 2010: Power for Land, Sea, and Air. New York: ASME, 2010: 2065-2074.
[9] Hu L J, Yang C, Sun H M, et al. Effect of casing treatment on the centrifugal compressor shock wave/tip leakage interaction[J]. Transactions of Beijing Institute of Technology, 2010, 30(5): 521-526. (in Chinese)胡良军, 杨策, 孙惠民, 等. 机匣处理对离心压气机激波与泄漏涡干涉的影响[J]. 北京理工大学学报, 2010, 30(5): 521-526.
[10] Huang G P, Liang D W, Chen J. Pre-cyclone vane type engine case processing method: China. ZL200710024378.5 [P]. 2011-04-20. (in Chinese)黄国平, 梁德旺, 陈杰. 预旋叶片式机匣处理方法: 中国. ZL200710024378.5[P]. 2011-04-20.
[11] Gao P, Chu W L, Wu Y H. Stall control of a centrifugal compressor with recess vaned casing treatment[J]. Journal of Engineering for Thermal Energy and Power, 2008, 23(3): 229-234. (in Chinese)高鹏, 楚武利, 吴艳辉. 离心压气机凹槽导流片式机匣处理失速控制研究[J]. 热能动力工程, 2008, 23(3): 229-234.
[12] Xiao J, Xu W, Gu C G, et al. Self-recirculating casing treatment for a radial compressor[J]. Chinese Journal of Mechanical Engineering, 2009, 22(4): 567-573.
[13] Tamaki H. Effect of recirculation device with counter swirl vane on performance of high pressure ratio centrifugal compressor[J]. Journal of Turbomachinery, 2012, 134(5): 051036.
[14] Shi J C, Zou X Q, Wen Q, et al. Study on new type casing treatment method for centrifugal compressor[J]. Aeroengine, 2010, 36(3): 1-4. (in Chinese)石建成, 邹学奇, 温泉, 等. 离心压气机流动控制机匣新型处理方式研究[J]. 航空发动机, 2010, 36(3): 1-4.
[15] Teng J F, Zhu M M, Qiang X X. Effect of double inclined slotted casing treatment on centrifugal compressor performance[J]. Journal of Aerospace Power, 2013, 28(1): 164-170. (in Chinese)滕金芳, 朱铭敏, 羌晓青. 双倾斜壁缝式机匣处理对离心压气机性能的影响[J]. 航空动力学报, 2013, 28(1): 164-170.
[16] Kang J X. Improved design and experimental in-vestigation for the centrifugal impeller of a 75 kW gas turbine engine[D]. Shanghai: Shanghai Jiaotong University, 2008. (in Chinese)康剑雄. 75 kW燃气轮机离心叶轮改进设计及试验研究[D]. 上海: 上海交通大学, 2008.
[17] Ning F F, Fan L. Quasi-steady flow model of slot-type casing treatmentsⅠ: modeling method and validation[J]. Journal of Aerospace Power, 2012, 27(6): 1261-1269. (in Chinese)宁方飞, 樊琳. 一种槽道式处理机匣的准定常流动模型Ⅰ: 建模方法及验证[J]. 航空动力学报, 2012, 27(6): 1261-1269.
[18] Vo H D, Tan C S, Greitzer E M. Criteria for spike initiated rotating stall[J]. Journal of Turbomachinery, 2008, 130(1): 011023.
/
| 〈 |
|
〉 |
CJA