Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Aerodynamic Characteristics Analysis of Small Two-Stage Turbo Blower Using CFD

CFD를 이용한 소형 2단 터보블로워의 공력해석

  • Seo, Seungjae (Department of Mechanical Engineering, Hanyang University) ;
  • Ryu, Minhyoung (Department of Mechanical Engineering, Hanyang University) ;
  • Cho, Leesang (Department of Mechanical & System Engineering, Hansung University) ;
  • Cho, Jinsoo (School of Mechanical Engineering, Hanyang University)
  • Received : 2014.01.03
  • Accepted : 2014.03.26
  • Published : 2014.04.01
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Abstract

Aerodynamic characteristics of the small two-stage turbo blower were investigated using commercial CFD tool(ANSYS CFX Ver. 14.5) in this paper. Turbo blower, which is a centrifugal type of turbomachinery, is used in various industries. It is used for application that required high static pressure rising at relatively small volumetric flow rate. In order to understand the mechanism of static pressure rising, the aerodynamic characteristics of the small two-stage turbo blower are analyzed at high rotating speed in this study. The k-${\omega}$ SST turbulence model, which is good at prediction of adverse pressure gradient flows, was applied. The CFD results of the turbo blower are validated by performance test. The static pressure rising of the turbo blower is nonlinearly increased over the first stage and the second stage. The secondary flow occurred at guide vanes, between the casing and the first impeller shroud, and the bottom of the impeller disk. As a result, It is required that whole fluid area is analyzed to predict aerodynamic characteristics of small two-stage turbo blower. and the result should be selected with considering for error from experiment and CFD.

터보블로워는 상대적으로 적은 체적유량에서 높은 압력이 요구되는 곳에 사용되는 대표적인 유체기계로서 다양한 산업에 응용되어 사용된다. 본 연구에서는 고속으로 회전하는 소형 2단 터보블로워의 정압상승 메커니즘을 이해하기위해, 1단 임펠러 영역과 터보블로워 전체 영역에 대해서 상용툴인 ANSYS 14.5를 이용하여 CFD해석을 수행하였다. CFD 해석과정에는 역압력 구배에 의한 유동박리 예측에 적합한 k-${\omega}$ SST 난류 모델을 적용하였다. 터보블로워의 전산해석 결과는 KS B 6311 및 KS A 0612에 따른 성능시험방법을 통하여 해석기법이 타당함을 검증하였다. CFD 해석결과 터보블로워의 압력상승은 선형적으로 나타나지 않으며, 안내깃에서의 손실과 케이싱과 임펠러 간극에서 손실이 발생하는 것으로 분석되었다. 소형 2단 터보블로워를 공력성능을 예측하기 위해서는 전체 유동영역에 대한 전산 해석이 필요하며, 실험과 전산해석의 오차에 대해 고려된 전산해석 결과가 선정되어야 한다.

Keywords

References

  1. Frank P. Bleier, FanHandBook, McGraw -Hill, 1997.
  2. Woosung Kwon, "Status and Development of an Industrial Compressor," KSME, Vol.52, No.10, 2012, pp.45-48.
  3. Hweryong Kim, Kwangho Kim, "Research and Development Trends of Industrial Blowers," KFMA, Vol. 2, No. 3, 1999, pp.77-82.
  4. Choon-Man Jang and Sang-Ho Yang, "Performance Characteristics of a Turbo Blower Having the Various Shapes of a Volute Casing," KSME-B, Vol. 34, No. 9, 2010, pp.834-850. https://doi.org/10.3795/KSME-B.2010.34.9.843
  5. Choon Man Jang, Ka Ram Choi and Sang Ho Yang, "Performance Analysis of a Centrifugal Fan with Splitters," KSME-B, Vol. 35, No. 10, 2011, pp.1067-1073. https://doi.org/10.3795/KSME-B.2011.35.10.1067
  6. Hanyoung Park, Hyuntaek Oh, Youhwan Shin, Yoonpyo Lee, Kwangho Kim, Jintaek Chung, "Numerical Analysis Techniques and Flow chracteristics of Two-Stage Centrifugal Compressor for R135a Turbo-Chiller," KSFM, Vol 10, No. 4, 2007, pp.29-38.
  7. H. Stel, G. D. L. Amaral, C. O. R. Negrao, S. Chiva, V. Estevam and R. E. M. Morales, "Numerical Analysis of the Fluid Flow in the First 15Stage of a Two-Stage Centrifugal Pump With a Vaned Diffuser," Journal of Fluids Engineering, Vol. 135, No. 7, 2013, pp.071104,1-9.
  8. Si Huang, Mohammed F. Islam, Pengfei Liu, "Numerical simulation of 3D turbulent flow through and entire stage in a multistage centrifugal pump," International Journal of Computational Fluid Dynamics, Vol. 20, No. 5, June 2006, pp.309-314 https://doi.org/10.1080/10618560600916981
  9. ANSYS CFX, Ansys CFX Realease 14.5 User Guide, ANSYS Inc. 2012.
  10. H.K. Versteeg, W. Malalasekera, An introduction to computational fluid dynamics, Prentice Hall, 1995.
  11. Menter, F. R., "Two-equation eddy viscosity turbulence models for engineering applications," AIAA Journal, Vol.32, No. 8, 1994, pp. 1598∼1605. https://doi.org/10.2514/3.12149
  12. Rodrick V. Chima, "Calculation of multistage turbomachinery using steady characteristic boundary conditions," 36th Aerospace Sciences Meeting & Exhibit (Reno, NV, 1998), AIAA 98-0968.
  13. R.A Walis, Axial Flow Fan and Ducts, John Wiley & Sons Inc., 1983.
  14. Leesang Cho, Seawook Lee and Jinsoo Cho, "Use of CFD Analyses to Predict Disk Friction Loss of Centrifugal Compressor Impellers," Transactions of the Japan Society for Aeronautical and Space Sciences, Vol. 55, No. 3, 2012, pp.150-156. https://doi.org/10.2322/tjsass.55.150
  15. David Japikse, Centrifugal Compressor Design and Performance, Concepts ETI, VT, 1996.
  16. David Japkise, Nicholas c. Baines, Introduction to Turbomachinery, Concepts ETI and Oxford University Press, VT, 1994.