Computational fluid dynamics analysis of the complex flows in a cryogenic turboexpander is essential for any improvement in its performance. This includes a detailed analysis of the unsteady turbulent flows imparted mainly by the rotor stator interactions. The flow unsteadiness due to rotor stator interaction is caused by the relative motion between the stationary and rotating component, interaction of the turbine wheel blades with the wakes and vortices generated by the upstream blades and at trailing edges. In order to minimize the loss generation due to this unsteadiness, the vaneless space length at the nozzle-turbine wheel interface and the length of the straightening portion at the turbine wheel-diffuser interface should be optimised considering the mechanical constraints. In this paper three dimensional unsteady viscous flow analysis of a helium cryogenic turboexpander was carried out using Ansys CFX to investigate the origin and flow mechanisms that cause these unsteady phenomena. The analysis has been done for three different lengths of straightening duct at the turbine wheel diffuser interface. The performance parameters from the computational results were compared and analysed to understand the flow characteristics in each case.
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ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
June 13–17, 2016
Seoul, South Korea
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4974-3
PROCEEDINGS PAPER
Helium Turboexpander for Cryogenic Refrigeration and Liquefaction Cycles: Transient Analysis of Rotor–Stator Interaction Available to Purchase
Ashish Alex Sam,
Ashish Alex Sam
Indian Institute of Technology Kharagpur, West Bengal, India
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Parthasarathi Ghosh
Parthasarathi Ghosh
Indian Institute of Technology Kharagpur, West Bengal, India
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Ashish Alex Sam
Indian Institute of Technology Kharagpur, West Bengal, India
Parthasarathi Ghosh
Indian Institute of Technology Kharagpur, West Bengal, India
Paper No:
GT2016-56793, V003T06A009; 10 pages
Published Online:
September 20, 2016
Citation
Alex Sam, A, & Ghosh, P. "Helium Turboexpander for Cryogenic Refrigeration and Liquefaction Cycles: Transient Analysis of Rotor–Stator Interaction." Proceedings of the ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. Volume 3: Coal, Biomass and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration; Organic Rankine Cycle Power Systems. Seoul, South Korea. June 13–17, 2016. V003T06A009. ASME. https://doi.org/10.1115/GT2016-56793
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