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Investigation on Thrust and Moment Coefficients of a Centrifugal Turbomachine

Department of Mechanical Engineering, University of Duisburg-Essen, 47057 Duisburg, Germany
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This paper is an extended version of our paper published in Proceedings of the 17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC 2017), Paper No. 77.
Int. J. Turbomach. Propuls. Power 2018, 3(2), 9; https://doi.org/10.3390/ijtpp3020009
Received: 9 February 2018 / Revised: 2 April 2018 / Accepted: 4 April 2018 / Published: 11 April 2018
In radial pumps and turbines, the centrifugal through-flow in both the front and the back chambers is quite common. It strongly impacts the core swirl ratio, pressure distribution, axial thrust and frictional torque. In order to investigate these relationships experimentally, a test rig was designed at the University of Duisburg-Essen and described in this paper. Based on both the experimental and numerical results, correlations are determined to predict the impacts of the centrifugal through-flow on the core swirl ratio, the thrust coefficient and the moment coefficient. Two correlations respectively are determined to associate the core swirl ratio with the local through-flow coefficient for both Batchelor type flow and Stewartson type flow. The correlations describing the thrust coefficient and the moment coefficient in a rotor-stator cavity with centripetal through-flow (Hu et al., 2017) are modified for the case of centrifugal through-flow. The Daily and Nece diagram distinguishing between different flow regimes in rotor-stator cavities is extended with a through-flow coordinate into 3D. The achieved results provide a comprehensive data base which is intended to support the calculation of axial thrust and moment coefficients during the design process of radial pumps and turbines in a more accurate manner. View Full-Text
Keywords: rotor-stator cavity; centrifugal through-flow; core swirl ratio; pressure; thrust coefficient; moment coefficient rotor-stator cavity; centrifugal through-flow; core swirl ratio; pressure; thrust coefficient; moment coefficient
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Hu, B.; Brillert, D.; Dohmen, H.J.; Benra, F.-K. Investigation on Thrust and Moment Coefficients of a Centrifugal Turbomachine. Int. J. Turbomach. Propuls. Power 2018, 3, 9.

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