Influence of the U-shape inlet pipe on a centrifugal compressor performance
-
摘要: 采用实验和数值模拟的方法研究了U型管道进气对某离心压气机性能的影响.实验结果显示,相比直管进气,U型管道进气在大流量工况下显著降低了压气机性能,压比、效率的下降量分别可达10%和18%以上.数值分析表明:U型管道进气时,其出口产生静压和总压畸变;压气机下游蜗壳因几何周向不均而存在相应的压力畸变,该畸变沿叶轮槽道向上游传播的过程中与进气畸变发生耦合.这种耦合作用改变了叶轮进口的流场结构,使叶轮槽道流量分布发生变化,叶轮对应畸变区域的熵值增加;同时还改变了叶片表面静压的分布形式,使整个叶轮主叶片的平均载荷增大约8%.Abstract: The effects of the U-shape pipe on a centrifugal compressor were investigated with experimental and numerical simulation methods. Compared with straight pipe inlet, the bend pipe resulted in a significant performance degradation of the compressor at the high mass flow rate. The pressure ratio and efficiency dropped by 10% and 18%, respectively. The numerical results show that the distortions of the static pressure and the total pressure were generated at the outlet of U-shape pipe. The pressure distortions were induced by the circumferential nonuniform geometry of downstream compressor volute. When transported to the upstream blade channels, the outlet pressure distortions encountered with the inlet pressure distortions. These coupled distortions changed the flow structure and inlet conditions in the impeller inlet, and also the mass flow rates distribution in the blade channels. The entropy increase existed at the distortion regions of the impeller. Meanwhile, the mean load of whole main blades increased about 8% due to the variations of the static pressure distribution at main blade surfaces.
-
Key words:
- centrifugal compressor performance /
- U-shape inlet pipe /
- pressure distortion /
- coupling /
- impeller
-
[1] Ariga I,Kassai N,Masuda S,et al.The effect of inlet distortion on the performance characteristicsof a centrifugal compressor[J].Journal of Engineering for Gas Turbines and Power,1983,105(2):223-230. [2] Zemp A,Kammerer A,Abhari R S.Unsteady CFD investigation on inlet distortion in a centrifugal compressor[J].Journal of Turbomachinery,132(3):031015.1-031015.9. [3] Kammerer A,Abhari R S.Blade forcing function and aerodynamic work measurements in a high speed centrifugal compressor with inlet distortion[J].Journal of Engineering for Gas Turbines and Power,2010,132(9):092504.1-092504.11. [4] Engeda A,Kim Y,Aungier R,et al.The inlet flow structure of a centrifugal compressor stage and its influence on the compressor performance[J].Journal of Fluids Engineering,2003,125(5):779-784. [5] 李杜,杨策,陈山,等.带90°弯管的离心压气机进口畸变数值研究[J].航空动力学报,2010,25(11):2556-2563. LI Du,YANG Ce,CHEN Shan,et al.Numerical simulation on inlet distortion of centrifugal compressor with 90 degree bent pipe[J].Journal of Aerospace Power,2010,25(11):2556-2563.(in Chinese) [6] 李杜,杨策,陈山,等.离心压气机弯管进口畸变非定常特性[J].内燃机学报,2011,29(5):468-474. LI Du,YANG Ce,CHEN Shan,et al.Unsteady characteristics on bend-pipe inlet distortion of centrifugal compressor[J].Transactions of CSICE,2011,29(5):468-474.(in Chinese) [7] YANG Ce,ZHAO Ben,MA Chaochen,et al.Effect of the different geometrical inlet pile on the high speed centrifugal compressor[R].ASME Paper GT2013-94254,2013. [8] LI Du,YANG Ce,ZHOU Mi,et al.Numerical and experimental research on different inlet configuration of high speed centrifugal compressor[J].Science China:Technological Sciences,2012,55(1):174-181. [9] WANG Leilei,YANG Ce,ZHAO Ben,et al.The change of the inlet geometry of a centrifugal compressor stage and its influence on the compressor performance[J].Journal of Thermal Science,2013,22(3):197-208. [10] 康顺,刘强,祁明旭.一个高压比离心叶轮的CFD 结果确认[J].工程热物理学报,2005,26(3):400-404. KANG Shun,LIU Qiang,QI Mingxu.CFD validation of a high speed centrifugal compressor impeller[J].Journal of Engineering Thermophysics,2005,26(3):400-404.(in Chinese) [11] Fatsis A,Pierret S,Van den Braembussche R.Three-dimensional unsteady flow and forces in centrifugal impellers with circumferential distortion of the outlet static pressure[J].Journal of Turbomachinery,1997,119(1):94-102. [12] Zheng X Q,Huenteler J,Yang M Y,et al.Influence of the volute on the flow in a centrifugal compressor of a high-pressure ratio turbocharger[J].Journal of Power and Energy,2010,224(8):1157-1169. [13] Gu F H,Engeda A.A numerical investigation on the volute/impeller steady-state interaction due to circumferential distortion[R].ASME Paper 2001-GT-0328,2001. [14] LI Du,YANG Ce,ZHAO Ben,et al.Investigation on centrifugal impeller in an axial-radial combined compressor with inlet distortion[J].Journal of Thermal Science,2011,20(6):486-494. [15] Brune K H,Schiffer H P,Christmann R,et al.Experimental investigations of the disturbed inlet-flow structure caused by mixing geometries and its influence on the performance of a turbocharger centrifugal compressor[R].ASME Paper GT2009-59534,2009. [16] Miller D S.Internal flow systems design and performance prediction[M].2nd ed.Houston:Gulf Publishing Company,1990. [17] Sorokes J M,Borer C J,Koch J M.Investigation of the circumferential static pressure non-uniformity caused by a centrifugal compressor discharge volute[R].ASME Paper 98-GT-326,1998. [18] Hagelstein D,Van den Braembussche R,et al.Experimental investigation of the circumferential pressure distortion in centrifugal compressor stages[R].ASME Paper 1997-GT-50,1997. [19] Ayder E,Van den Braembussche R,Brasz J J.Experimental and theoretical analysis of the flow in a centrifugal compressor volute[J].Journal of Turbomachinery,1993,115(3):582-589.
点击查看大图
计量
- 文章访问数: 815
- HTML浏览量: 1
- PDF量: 519
- 被引次数: 0