Main Article Content
Abstract
Details of a measurement technique to measure periodic variation of static pressure on the vaneless diffuser hub of a centrifugal compressor are reported. Experiments were carried out in a low speed centrifugal compressor with unshrouded rotor. Twelve holes were provided on the hub in which adapters were attached, where the transducer was inserted. The output voltage from the transducer was amplified and converted to digital values for further processing of data. Sample results are presented and interpreted. From the measured static pressure distribution, it is found that the static pressure becomes uniform at downstream locations. Time averaged static pressures agree reasonably well with steady state static pressures. The reasons for the difference between the time averaged static pressures and steady state static pressures are provided.
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References
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- Yong Sang Yoon., Seung Jin Song and Hyoun-Woo Shin., "Influence of Flow Coefficient, Stagger Angle, and Tip Clearance on Tip Vortex in Axial Compressors", ASME Journal of Fluids Engineering, 128, November 2006, pp.1274-1280.
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- YangCe., Wang Yingjun., Lao Dazhong., Wang Wenli., Yang Changmao., Chen Xiaodi and Zhang Hanzhi., "Detailed Measurements of the Static Pressure Characteristics Around the Centrifugal Compressor casing wall", Bulletin of the JSME, Journal of Thermal Science and Technology, 12 (1), 2017.
- Yang Ce., Zhang Hanzhi., Yang Dengfeng., Lao Dazhong and Yang Changmao ., "Casing Wall Static Pressure Distribution Behavior in a Centrifugal Compressor with Asymmetric Inlet/Outlet Structures", Proceedings of the IMechE Part A: J Power and Energy, 2018, pp.1-15. DOI: 10.1177/0957650918774934.
- Anish, S. and Sitaram, N., "Effect of Inlet Vane Angle of a Partial Vane Diffuser on the Performance of a Centrifugal Compressor", Journal of Aerospace Sciences and Technologies, Vol.68, No.2, pp.89- 100, May 2016.
- Bauinger Sabine., Marn Andreas., Göttlich Emil and Heitmeir Franz., "Influence of Pressure Fluctuations on the Mean Value of Different Pneumatic Probes", International Journal of Turbomachinery Propulsion and Power, Vol.2, No.13, 14 Pages. doi:10.3390/ijtpp2030013, 2017.
References
Lakshminarayana, B., "Techniques for Aerodynamic and Turbulence Measurements in Turbomachinery Rotors", ASME Journal of Engineering for Power, 103 (2), April 1981, pp.374-392. doi:10.1115/1.3230732.
Sitaram, N. and Sivakumar, G. Ch.V., "Effect of Partial Shrouds on the Performance and Flow Field of a Low-Aspect-Ratio Axial-Flow Fan Rotor", International Journal of Rotating Machinery, Vol.2011, Article ID146969, 2001, 11 Pages. http://dx.doi.org/10.1155/2011/146969.
Wagner, J. H., Okiishi, T. H. and Holbrook, G. J., "Periodically Unsteady Flow in an Imbedded Stage of a Multistage Axial-Flow Turbomachine", ASME Journal of Engineering for Power, 101 (1), 1979, pp.42-51.
Eckardt, D., "Instantaneous Measurements in the Jet- Wake Discharge Flow of a Centrifugal Compressor Impeller", ASME Journal of Engineering for Power, Vol.97, July 1975, pp.337-345.
Senthil Kumaran, R., Kishor Kumar and Poornima, N., "Experimental Study of Unsteady Pressure Fluctuations Due to Tip Leakage Flows in an Axial Flow Turbine", GTINDIA2017-4868, Proceedings of the ASME 2017 Gas Turbine India Conference GTINDIA2017 December 7-8, 2017, Bangalore, India.
Yong Sang Yoon., Seung Jin Song and Hyoun-Woo Shin., "Influence of Flow Coefficient, Stagger Angle, and Tip Clearance on Tip Vortex in Axial Compressors", ASME Journal of Fluids Engineering, 128, November 2006, pp.1274-1280.
Young Anna., Day Ivor and Pullan Graham., "Stall Warning by Blade Pressure Signature Analysis", ASME Journal of Turbomachinery, Vol.135 (1), 011033 October 30, 2012, 10 Pages, Paper No. TURBO-11-1182. doi: 10.1115/1.4006426.
YangCe., Wang Yingjun., Lao Dazhong., Wang Wenli., Yang Changmao., Chen Xiaodi and Zhang Hanzhi., "Detailed Measurements of the Static Pressure Characteristics Around the Centrifugal Compressor casing wall", Bulletin of the JSME, Journal of Thermal Science and Technology, 12 (1), 2017.
Yang Ce., Zhang Hanzhi., Yang Dengfeng., Lao Dazhong and Yang Changmao ., "Casing Wall Static Pressure Distribution Behavior in a Centrifugal Compressor with Asymmetric Inlet/Outlet Structures", Proceedings of the IMechE Part A: J Power and Energy, 2018, pp.1-15. DOI: 10.1177/0957650918774934.
Anish, S. and Sitaram, N., "Effect of Inlet Vane Angle of a Partial Vane Diffuser on the Performance of a Centrifugal Compressor", Journal of Aerospace Sciences and Technologies, Vol.68, No.2, pp.89- 100, May 2016.
Bauinger Sabine., Marn Andreas., Göttlich Emil and Heitmeir Franz., "Influence of Pressure Fluctuations on the Mean Value of Different Pneumatic Probes", International Journal of Turbomachinery Propulsion and Power, Vol.2, No.13, 14 Pages. doi:10.3390/ijtpp2030013, 2017.