MODEL FREON COMPRESSOR ACOUSTICAL STUDIES.
Abstract
Development was continued on the scale model Freon compressor facility for investigation of compressor/fan acoustics by improvements to the test loop, addition of exhaust noise measurements, improved instrumentation, automation of data reduction, and generalization of mode/full-scale scaling laws over five gases and a wide range of operating conditions. It is concluded that the facility affords a new tool for acoustic research and development work, and for preliminary engineering evaluation prior to committing a design to large scale. Full-scale, high Mach number fan aerodynamic performance can be adequately simulated and reasonable correlation obtained between scale-model and full-scale acoustic performance. Controlled laboratory-type test conditions can be provided at a fraction of the cost and time required for full-scale fan development. Both minor and major variations in blade/vane spacing were evaluated as were variations in vane number; both investigations led to new results. Fans of two different aerodynamic designs were investigated and new results obtained regarding the dependency of fan noise on rotational speed. Duct probe and far-field acoustic power determinations were compared conditionally. Incipient fan stall determination via acoustic measurements was explored. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1968
- Accession Number
- AD0666320
Entities
People
- J. M. Mcgrew
- R. J. Wells
Organizations
- General Electric