A practical framework for predicting jet structure and noise from military aircraft is described, which is developmental and has been examined for some fundamental jet flow problems. The framework currently utilizes Reynolds-averaged Navier Stokes (RANS) methodology for geometrically complex internal propulsive flowpaths and large eddy simulation (LES) methodology for the jet structure downstream of the nozzle exit. Temporal data from the LES solution is stored on a flared-cylindrical surface surrounding the jet, to be used for noise propagation to the farfield. Earlier applications of RANS methodology combined with the use of analogy-based jet noise codes proved inadequate due to the inability of the noise codes to treat complex 3D flows, such as those associated with multiple nozzles and/or with varied jet noise reduction concepts. Restricting the use of LES (or RANS/LES), methodology to free shear flows remedies the severe grid resolution issues that would be encountered with utilization of LES for modeling internal propulsive flows. The issue of “adequately” initiating the LES solution from a RANS solution profile just downstream of the nozzle exit has been the focus of our exploratory studies and is clearly more complex than standard procedures, such as recycling and rescaling techniques used for simple wall bounded flows. Approaches examined are discussed and unified RANS/LES solutions for several flows are described. The application of this framework to more complex flows requires no fundamental modifications as will also be discussed.
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April 2011
Research Papers
LES Predictions of Noise Emissions From a Low-Bypass Ratio Military Gas Turbine Engine
N. Sinha,
N. Sinha
Combustion Research and Flow Technology, Inc., (CRAFT Tech)
, Pipersville, PA 18947
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J. Erwin,
J. Erwin
Combustion Research and Flow Technology, Inc., (CRAFT Tech)
, Pipersville, PA 18947
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C. Kannepalli
C. Kannepalli
Combustion Research and Flow Technology, Inc., (CRAFT Tech)
, Pipersville, PA 18947
Search for other works by this author on:
N. Sinha
Combustion Research and Flow Technology, Inc., (CRAFT Tech)
, Pipersville, PA 18947
J. Erwin
Combustion Research and Flow Technology, Inc., (CRAFT Tech)
, Pipersville, PA 18947
C. Kannepalli
Combustion Research and Flow Technology, Inc., (CRAFT Tech)
, Pipersville, PA 18947J. Eng. Gas Turbines Power. Apr 2011, 133(4): 041202 (10 pages)
Published Online: November 19, 2010
Article history
Received:
June 1, 2010
Revised:
June 10, 2010
Online:
November 19, 2010
Published:
November 19, 2010
Citation
Sinha, N., Erwin, J., and Kannepalli, C. (November 19, 2010). "LES Predictions of Noise Emissions From a Low-Bypass Ratio Military Gas Turbine Engine." ASME. J. Eng. Gas Turbines Power. April 2011; 133(4): 041202. https://doi.org/10.1115/1.4002274
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