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Noise and Efficiency of Axial-Flow Fans
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English
Abstract
A test apparatus was constructed and instrumented for testing tractor engine cooling fans in an environment simulating actual operating conditions. Tests were conducted to investigate the influence of the blade pitch angle, blade camber and fan rotational speed on the air delivery performance, the input power requirements, and the sound power radiated.
Prediction equations for the pressure coefficient and the power coefficient as functions of the flow coefficient and the blade pitch angle were developed for each level of blade camber. Prediction equations for the overall acoustic parameter as functions of the flow coefficient, Reynolds number and the blade pitch angle were also developed.
A comparison of the prediction equations for the pressure coefficient, the power coefficient and the overall acoustic parameter indicated that the efficiency and the range of efficiency decreased as the blade pitch angle increased. High values of the overall acoustic parameter were associated with higher Reynolds numbers and higher blade pitch angles. The comparison procedure should make possible the selection of a tractor radiator cooling fan based on noise production as well as air movement and efficiency.
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Citation
Hummel, J. and Weber, J., "Noise and Efficiency of Axial-Flow Fans," SAE Technical Paper 700702, 1970, https://doi.org/10.4271/700702.Also In
References
- Bommes L. “Effect on Fan Configuration on the Variation of Fan Sound Generation with Operating Condition.” ASHRAE Transactions 73 1967
- Huebner G. H. “Noise in Centrifugal Fans and Rotating Cylinders.” ASHRAE Transactions 69 1963
- Regier A. A. Hubbard H. H. “Status of Research on Propeller Noise and Its Reduction.” Journal of the Acoustical Society of America 25 3 395 404 1953
- Richards E. J. Sharland I. J. “Sources of Noise in Axial-Flow Fans.” Paper No. L-12 Fourth International Congress on Acoustics Copenhagen August 1962
- Chanaud R. C. “Aerodynamic Sound from Centrifugal Fan Rotors.” Journal of Acoustical Society of America 37 969 974 1965
- von Gierke H. E. “Physical Characteristics of Aircraft Noise Sources.” Journal of Acoustical Society of America 25 3 367 378 1963
- Groff G. C. Schreiner J. R. Bullock C. E. “Centrifugal Fan Sound Power Level Prediction.” ASHRAE Transactions 73 1967
- Hardy H. C. “Generalized Theory for Computing Noise from Turbulence in Aerodynamic Systems.” ASHRAE Transactions 69 85 90 1963
- Maling, G. C. Jr. “Dimensionless Analysis of Blower Noise.” ASA Journal 35 10 1556 1564 1963
- Bekker M. G. “Theory of Land Locomotion.” The University of Michigan Press Ann Arbor 1956
- Curry R. W. “Effect of Shroud and Core Spacing on the Performance of an Axial-Flow Fan.” 83 University of Illinois Urbana, Illinois 1970
- “Test Code for Air Moving Devices.” AMCA Standard Park Ridge, Illinois 1967
- Hummel J. W. “Axial-Flow Fan Performance and Sound Power Levels.” 115 University of Illinois Urbana, Illinois 1969
- Ebbing C. Carrier Corporation Carrier Parkway, Syracuse, New York Drawings and bill of materials for microphone traverse 1969
- “Measurement of Sound Power Radiated from Heating, Refrigerating and Air-Conditioning Equipment.” ASHRAE Standard 36-62 February 1962