Numerical characterization of the background noise generated by the ARL/Penn state Garfield Thomas water tunnel impeller

Michael L. Jonson, Micah R. Shepherd, Eric C. Myer, Stephen A. Hambric, Rachael J. DeRoche

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The Pennsylvania State University Applied Research Laboratory has a 1.22 meter (48 inches) diameter closed loop water tunnel. The flow is driven by an axial pump with three blade rows and powered by a 1.5 MW motor. The four blades of the impeller have the highest relative velocities of any lifting surface in the facility, and generate input acoustic power which acts as a background noise floor in tunnel measurements of turbomachinery and vehicle body performance. In this paper, we investigate the sound power radiated by the impeller and its propagation through the water tunnel. Trailing edge hydrodynamic forcing functions are computed for the impeller based on local relative velocities and turbulence properties. For lower frequencies, these forces are then applied to an experimentally validated structural finite element model (FEM) of the impeller. The input power to the water tunnel is determined using an acoustic boundary element model (BEM) of the impeller. A statistical energy (SEA) model of the water tunnel allows for an estimate of the rms pressure within the water tunnel test section to provide guidance on lowering background noise.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages43-50
Number of pages8
ISBN (Print)9780791843888
DOIs
StatePublished - Jan 1 2010
Event2009 ASME International Mechanical Engineering Congress and Exposition, IMECE2009 - Lake Buena Vista, FL, United States
Duration: Nov 13 2009Nov 19 2009

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings
Volume15

Other

Other2009 ASME International Mechanical Engineering Congress and Exposition, IMECE2009
CountryUnited States
CityLake Buena Vista, FL
Period11/13/0911/19/09

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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    Jonson, M. L., Shepherd, M. R., Myer, E. C., Hambric, S. A., & DeRoche, R. J. (2010). Numerical characterization of the background noise generated by the ARL/Penn state Garfield Thomas water tunnel impeller. In Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009 (pp. 43-50). (ASME International Mechanical Engineering Congress and Exposition, Proceedings; Vol. 15). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2009-10468