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Abstract
Flow measurements in the passages of different types of diffusers of a centrifugal compressor at off design flow coefficients are presented and compared with those at design flow coefficient in this paper. The measurements are carried out using a precalibrated three hole pressure probe. The measurements are carried out in the passages of the following diffusers: vaneless, vane, low solidity vane and partial vane diffusers. The results are presented as contours, axially averaged and mass averaged flow parameters. The partial vane diffuser shows slightly improved flow field. At the above design flow coefficient, both vane and low solidity vane diffusers suffer large losses due to high incidences causing large drop in static pressure.
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References
- Senoo, Y., Japanese Patent Application Disclosure 11941/78, (in Japanese), Oct. 18, 1978.
- Yoshinaga, Y., Kaneki, T., Kobayashi, H. and Hoshino, M., "A Study of Performance Improvement for High Specific Speed Centrifugal Compressors by Using Diffusers with Half Guide Vanes", ASME Journal of Fluids Engineering, Vol. 109, pp. 359-367, 1987.
- Issac, J.M., Sitaram, N. and Govardhan, M., "Effect of Diffuser Vane Height and Position on the Performance of a Centrifugal Compressor", Proceedings of the Institution of Engineers, Part A: Journal of Power and Energy, Vol. 218, No. 6, pp. 647-654, 2004 . 4. Sitaram, N., Issac, J. M. and Govardhan, M., "Effect of Diffuser Vane Height on Diffuser Wall Static Pressure Distribution in a Centrifugal Compressor", Journal of Aerospace Sciences and Technologies, Vol. 58, No. 4, pp. 322-337, 2006.
- Sitaram, N., Issac, J. M. and Govardhan, M., "Flow Measurements in Passages of Different Diffusers of a Centrifugal Compressor", Journal of Aerospace Sciences and Technologies, Vol. 60, No.1, pp. 26-38, 2008.
- Casey, M.V., "The Effects of Reynolds Number on the Efficiency of Centrifugal Compressor Stages", ASME Journal of Engineering for Gas Turbines and Power, Vol. 107, No. 2, pp. 541-548, 1985.
- Eynon, P. A. and Whitfield, A., "Effect of Low Solidity Vaned Diffusers on the Performance of a Turbocharger Compressor", Proceedings of the Institution of Engineers, Part C: Journal of Mechanical Engineering Science, Vol. 211, No. 4, pp. 325-339, 1997.
- Kmecl, T., Harkel, R. and Dalbert, P., "Optimization of a Vaned Diffuser Geometry for Radial Compressors: Part II-Optimisation of a Diffuser Vane Profile in Low Solidity Diffusers", ASME Paper 99-GT- 434, 1999.
- Issac, J. M., "Performance and Flow Field Measurements in Different Types of Diffusers of a Centrifugal Compressor", Ph. D. Thesis, Indian Institute of Technology Madras, 2004.
References
Senoo, Y., Japanese Patent Application Disclosure 11941/78, (in Japanese), Oct. 18, 1978.
Yoshinaga, Y., Kaneki, T., Kobayashi, H. and Hoshino, M., "A Study of Performance Improvement for High Specific Speed Centrifugal Compressors by Using Diffusers with Half Guide Vanes", ASME Journal of Fluids Engineering, Vol. 109, pp. 359-367, 1987.
Issac, J.M., Sitaram, N. and Govardhan, M., "Effect of Diffuser Vane Height and Position on the Performance of a Centrifugal Compressor", Proceedings of the Institution of Engineers, Part A: Journal of Power and Energy, Vol. 218, No. 6, pp. 647-654, 2004 . 4. Sitaram, N., Issac, J. M. and Govardhan, M., "Effect of Diffuser Vane Height on Diffuser Wall Static Pressure Distribution in a Centrifugal Compressor", Journal of Aerospace Sciences and Technologies, Vol. 58, No. 4, pp. 322-337, 2006.
Sitaram, N., Issac, J. M. and Govardhan, M., "Flow Measurements in Passages of Different Diffusers of a Centrifugal Compressor", Journal of Aerospace Sciences and Technologies, Vol. 60, No.1, pp. 26-38, 2008.
Casey, M.V., "The Effects of Reynolds Number on the Efficiency of Centrifugal Compressor Stages", ASME Journal of Engineering for Gas Turbines and Power, Vol. 107, No. 2, pp. 541-548, 1985.
Eynon, P. A. and Whitfield, A., "Effect of Low Solidity Vaned Diffusers on the Performance of a Turbocharger Compressor", Proceedings of the Institution of Engineers, Part C: Journal of Mechanical Engineering Science, Vol. 211, No. 4, pp. 325-339, 1997.
Kmecl, T., Harkel, R. and Dalbert, P., "Optimization of a Vaned Diffuser Geometry for Radial Compressors: Part II-Optimisation of a Diffuser Vane Profile in Low Solidity Diffusers", ASME Paper 99-GT- 434, 1999.
Issac, J. M., "Performance and Flow Field Measurements in Different Types of Diffusers of a Centrifugal Compressor", Ph. D. Thesis, Indian Institute of Technology Madras, 2004.