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Technical Briefs

Isothermal Boundary Condition at Casing Applied to the Rotor 37 Transonic Axial Flow Compressor

[+] Author and Article Information
Dario Bruna

NASA Glenn Research Center
Cleveland, OH 44135
e-mail: dariobruna@fastwebnet.it

Mark G. Turner

University of Cincinnati,
Cincinnati, OH 4522
e-mail: mark.turner@uc.edu

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received September 14, 2011; final manuscript received June 25, 2012; published online March 25, 2013. Editor: David Wisler.

The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States Government purposes.

J. Turbomach 135(3), 034501 (Mar 25, 2013) (4 pages) Paper No: TURBO-11-1205; doi: 10.1115/1.4007569 History: Received September 14, 2011; Revised June 25, 2012

Computational fluid dynamics (CFD) simulations are presented with an isothermal boundary condition at the casing for running NASA Rotor 37. The casing temperature is set to the inlet total temperature. Relative to the adiabatic simulations, the comparison to experimental efficiency is much improved for the 100% speed line. The efficiency difference between the isothermal and adiabatic solutions is about 1%, and matches the low-flow test condition. The profiles of total temperature with the isothermal boundary condition match the data near the casing. The adiabatic simulation has a total temperature overshoot that has been consistently part of any data comparison of CFD with this data set, and is typical of most compressor calculations. The efficiency profile has a similar improvement in matching the data because of its relationship to temperature. The real rig is not isothermal at the casing and may require more complex simulations such as a conjugate heat transfer approach to truly match the physics. However, the isothermal boundary condition is more accurate and more realistic than the adiabatic boundary condition.

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References

Figures

Grahic Jump Location
Fig. 6

Efficiency profiles comparison—high flow

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Fig. 5

Total TR profiles comparison—high flow

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Fig. 4

Total PR profiles comparison—high flow

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Fig. 3

Compressor rotor map—efficiency

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Fig. 2

Compressor rotor map—total pressure ratio (PR)

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Fig. 1

NASA Rotor 37 test facility and flowpath

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