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Licensed Unlicensed Requires Authentication Published by De Gruyter August 5, 2015

Investigation of Detailed Flow in a Variable Turbine Nozzle

  • Yixiong Liu , Dazhong Lao and Ce Yang EMAIL logo

Abstract

The detailed flow behavior of the nozzle channel of a variable turbine is presented in this paper. The numerical model of a variable nozzle turbine was developed by using computational fluid dynamics method, and validated by the measured performance data of the turbine. Two opening positions of the nozzle vane, as well as two inlet conditions of the nozzle representing different vane loadings, were investigated to evaluate the clearance flow behaviors. It is shown that the channel shock waves are produced at proper conditions, such as small opening and large inlet pressure, which has significant impact on the end wall clearance leakage flow. When the leakage flows through the end wall clearance from the pressure side to the suction side encountering by the main stream, and the leakage vortex is formed. It is found that this leakage vortex gradually enhanced from the trailing edge to the middle edge.

PACS: 47.85.Gj

Funding statement: Funding: The work was funded by the National Natural Science Foundation of China (No.51376024), and the Key Laboratory Fund of Industrial Corporation (No.9140C330102130C33001).

Acknowledgement

The author would like to thank Dr. Liu Yinhong and Dr. Zhaoben for the technology supports.

Nomenclature

Cp

specific heat

E

entropy

F

conservative flux

m

mass flow

Mais

isentropic Mach number

pr

reference pressure

ps

static pressure

pt

total pressure

RTA

residual

t

physical time

Tr

reference temperature

Ts

static temperature

u/c

velocity ratio

U

vector of conservative variable

V

vector of primitive variable

γ

specific heat ratio

ζ

pseudo time

η

efficiency

π

expansion ratio

Subscript
0

stagnation parameter

2

outlet parameter

Abbreviation
C1,C2

condition 1,2 respectively

P1,P2,P3,P4

cross plane in nozzle channel

CFD

computational fluid dynamic

LE

leading edge

TE

trailing edge

PS

pressure surface

SS

suction surface

References

1. Tang H, Pennycott A, Akehurst S, Brace CJ. A review of the application of variable geometry turbines to the downsized gasoline engine. Int J Eng Res 2014. DOI: 10.1177/1468087414552289.10.1177/1468087414552289Search in Google Scholar

2. O’Connor G, Smith M. Variable nozzle turbochargers for passenger car applications. SAE technical paper 880121, 1988. DOI: 10.4271/880121.10.4271/880121Search in Google Scholar

3. Hishikawa A, Okazaki Y, Busch P. Developments of variable area radial turbine for small turbochargers. SAE technical paper 880120, 1988. DOI: 10.4271/880120.10.4271/880120Search in Google Scholar

4. Kawaguchi J, Adachi K, Kono S, Kawakami T. Development of VFT (Variable Flow Turbocharger). SAE technical paper 1999-01-1242, 1999. DOI: 10.4271/1999-01-1242.10.4271/1999-01-1242Search in Google Scholar

5. Ishihara H, Adachi K, Kono S. Development of VFT Part 2. SAE technical paper 2002-01-2165, 2002. DOI: 10.4271/2002-01-2165.10.4271/2002-01-2165Search in Google Scholar

6. Hu LJ, Sun HM, Yi J, Curtis E, Morelli A, Zhang JZ, et al. Investigation of nozzle clearance effects on a radial turbine: aerodynamic performance and forced response. SAE technical paper 2013-01-0918, 2013. DOI: 10.4271/2013-01-0918.10.4271/2013-01-0918Search in Google Scholar

7. Jason W, Stephen S, Jan E, Thornhill D. An experimental assessment of the effects of stator vane tip clearance location and back swept blading on an automotive variable geometry turbocharger. J Turbomach 2013;136:061001.Search in Google Scholar

8. Liu YH, Yang C, Qi MX, Zhang HZ, Zhao B. Shock, leakage flow and wake interactions in a radial turbine with variable guide vanes. ASME Turbo Expo 2014, No. GT2014–25888.10.1115/GT2014-25888Search in Google Scholar

9. Seenoo Y, Yamaguchi M, Hyun YI, Hayami H. The influences of tip clearance on the performance of nozzle blades of radial turbines. JSME Int J 1987;30:929–35.10.1299/jsme1987.30.929Search in Google Scholar

10. Hyun Y, Senoo Y, Yamaguchi M, Hayami H. The influence of tip clearance on the performance of nozzle blades radial turbines (experimental and performance prediction at three nozzle angles). JSME Int Ser 2 1988;31:258–62.Search in Google Scholar

11. Hayami H, Seenoo Y, Hyun YI, Yamaguchi M. Effects of tip clearance of nozzle vanes on performance of radial turbine rotor. J. Turbomach 1990;112:58–63.10.1115/89-GT-82Search in Google Scholar

12. Tamaki H, Goto S, Unno M. The effect of clearance flow of variable nozzle on radial turbine performance. ASME paper, 2008, GT2008–50461.10.1115/GT2008-50461Search in Google Scholar

13. Hu LJ, Yang C, Sun H, Zhang JZ, Lai MC. Numerical analysis of nozzle clearance’s effect on turbine performance. Chin J Mech Eng 2011;24:618–25.10.3901/CJME.2011.04.618Search in Google Scholar

14. Roumeas M, Cros S. Aerodynamic investigation of a nozzle clearance effect on radial turbine performance. Proceedings of ASME Turbo Expo 2012, No.GT2012–68835.10.1115/GT2012-68835Search in Google Scholar

15. Putra MA, Joos F. Investigation of secondary flow behavior in a radial turbine nozzle. J Turbomach 2013;135:061003.10.1115/GT2006-90019Search in Google Scholar

16. Natkaniec CK, Kammeyer J, Seme JR. Secondary flow structures and losses in a radial turbine nozzle. ASME Turbo Expo, 2011, No. GT2011–46753.10.1115/GT2011-46753Search in Google Scholar

17. Artt DW, Spence SWT. A loss analysis based on experimental data for a 99.0 mm radial inflow nozzled turbine with different stator throat areas. Proc IMechE, 1998, vol 212, Part A, No.A04297.10.1243/0957650981536718Search in Google Scholar

18. Spence S, Artt DW. An experimental assessment of incidence losses in a radial inflow turbine rotor. Proc. IMechE., 1998, vol. 212, Part A, No. A04397.10.1243/0957650981536727Search in Google Scholar

19. Spence SWT, O’Neill JW, Cunningham G. An investigation of the flowfield through a variable geometry turbine stator with vane end wall clearance. Proc. IMechE., 2006, vol. 220, Part A, pp. 899–910.10.1243/09576509JPE171Search in Google Scholar

20. O’Neill JW, Spence S, An CG Assessment of stator vane leakage in a variable geometry radial turbine. Proceedings of the ETC 6th European conference on turbomachinery, Lille, France, 2005, March 7–11, vol. 2, No. RT-065-04/65.Search in Google Scholar

21. Kawakubo T. Unsteady rotor-stator interaction of a radial inflow turbine with variable nozzle vanes. Proceedings of ASME Turbo Expo 2010, Glasgow, UK, No.GT2010–23677.10.1115/GT2010-23677Search in Google Scholar

22. Sharma OP, Butler TL. Predictions of end wall losses and secondary flows in axial flow turbine cascades. ASME J Turbomach 1987;109:229–36.10.1115/1.3262089Search in Google Scholar

23. Gregory-Smith DG, Graves CP, Walsh JA. Growth of secondary losses and vorticity in an axial turbine cascade. ASME J Turbomach 1988;110:1–8.10.1115/1.3262163Search in Google Scholar

24. Langston LS. Secondary flow in axial turbines. Annals of the new york academy of sciences. Heat Transfer Gas Turbine Syst 2001;934:11–26.10.1111/j.1749-6632.2001.tb05839.xSearch in Google Scholar PubMed

Received: 2015-7-13
Accepted: 2015-7-22
Published Online: 2015-8-5
Published in Print: 2016-12-1

©2016 by De Gruyter

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