Abstract
The isentropic exponent is known to have a large impact on turbine aerodynamics yet there is little research into how this impacts the development of turbine wakes. This study aims to explore how the aerodynamics of a supersonic turbine cascade are affected by the isentropic exponent. This is achieved through both experimental and computational methods with working fluids of air, CO\(_2\) and R134a which gives a range of isentropic exponents from 1.07 to 1.4. The experiments are performed using a newly modified transient wind tunnel with the capability to obtain total pressure measurements in the wake of the cascade. This paper describes the development of the experimental apparatus as well as reporting the first-of-their-kind wake measurements from a turbine cascade operating with R134a. The resultant experimental wake measurements serve as a validation data set for various computational fluid dynamic approaches.
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Acknowledgments
This work was supported by the EPSRC (EP/L027437/1) and computational resources were provided by EPSRC Tier-2 capital grant EP/P020259/1. The authors would like to thank the reviewers for their insightful comments and valuable feedback.
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Baumgärtner, D., Otter, J.J., Wheeler, A.P.S. (2021). The Effect of Isentropic Exponent on Supersonic Turbine Wakes. In: Pini, M., De Servi, C., Spinelli, A., di Mare, F., Guardone, A. (eds) Proceedings of the 3rd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power. NICFD 2020. ERCOFTAC Series, vol 28. Springer, Cham. https://doi.org/10.1007/978-3-030-69306-0_16
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DOI: https://doi.org/10.1007/978-3-030-69306-0_16
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