A single stage cryogenic liquid turbine is designed for a large-scale internal compression air-separation unit to replace the Joule-Thompson valve and recover energy from the liquefied air during throttling process. It includes a 3-dimensional impeller, variable geometry nozzle, and asymmetrical volute. Strength evaluation of such a liquid turbine is both essential and complicated, which involves a proper evaluation of stress acting on the components and mechanical property of the chosen materials at low temperature. For metals under low temperatures, brittle fracture of the metal may occur prior to fatigue damage. A comprehensive consideration of low-temperature mechanical properties of materials and mechanical loads (due to hydrodynamic force and centrifugal force) acting on the components is of particular importance. Aluminum alloy 2031 is used for the turbine impeller and its mechanical properties under low temperatures are analyzed. To evaluate the stress acting on the components, numerical investigation using 3-D incompressible Navier-Stokes Equation together with k-epsilon turbulence model and mixing plane approach at rotator-stator interface are carried out at design and off-design flow with different nozzle-vane settings. The obtained pressure force is transformed into hydrodynamic load acting on the solid surface by means of fluid-solid interaction technology, and then used in the FEM (Finite Element Method) structure analysis together with the centrifugal force. Stress distribution of the component is obtained and deformation of the component analyzed. Evaluation of impeller strength is conducted for the cryogenic liquid turbine by combining the foregoing two aspects, and a use of alloy 2031 for the turbine expander is validated.
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ASME Turbo Expo 2010: Power for Land, Sea, and Air
June 14–18, 2010
Glasgow, UK
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4401-4
PROCEEDINGS PAPER
Investigation of Impeller Strength for a Cryogenic Liquid Turbine
Jinju Sun,
Jinju Sun
Xi’an Jiaotong University, Xi’an, China
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Rongye Zheng,
Rongye Zheng
Xi’an Jiaotong University, Xi’an, China
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Peng Song,
Peng Song
Xi’an Jiaotong University, Xi’an, China
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Ke Wang
Ke Wang
Xi’an Jiaotong University, Xi’an, China
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Yan Ren
Xi’an Jiaotong University, Xi’an, China
Jinju Sun
Xi’an Jiaotong University, Xi’an, China
Rongye Zheng
Xi’an Jiaotong University, Xi’an, China
Peng Song
Xi’an Jiaotong University, Xi’an, China
Ke Wang
Xi’an Jiaotong University, Xi’an, China
Paper No:
GT2010-23125, pp. 1333-1343; 11 pages
Published Online:
December 22, 2010
Citation
Ren, Y, Sun, J, Zheng, R, Song, P, & Wang, K. "Investigation of Impeller Strength for a Cryogenic Liquid Turbine." Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 6: Structures and Dynamics, Parts A and B. Glasgow, UK. June 14–18, 2010. pp. 1333-1343. ASME. https://doi.org/10.1115/GT2010-23125
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