USE OF SKEWED BLADES FOR SHIP PROPELLERS AND TRUCK FANS

The advantages of highly skewed (swept back) blades for ship propellers are being recognized in the marine industry. Benefits are realized in ship vibration due to the reduction of propeller excitation forces at the blade passage frequency; and in cavitation performance effecting vibrations, noise, and erosion. Benefits can also be realized in the noise performance of fans by the applications of skewed blade technology. Substantial reductions are achievable in the fluctuating aerodynamic forces and/or their radiation efficiency which yield both discrete frequency and continuous spectrum fan noise components. Examples are given of the design of a pair of engine cooling system fans for a heavy truck, one of which incorporated skewed blades. Acoustic measurements showed that the skewed blade fan had achieved an important noise reduction for the difficult to control continuous spectrum components. At the same time, an unexpected deficiency in cooling performance was revealed which required a 10% increase in fan speed to overcome.

  • Supplemental Notes:
    • Noise and Fluids Engineering, presented at the Winter Annual Meeting of ASME, Atlanta, Georgia, November 27-December 2, 1977.
  • Corporate Authors:

    American Society of Mechanical Engineers

    Two Park Avenue
    New York, NY  United States  10016-5990
  • Authors:
    • Brown, N A
  • Publication Date: 1977

Media Info

  • Pagination: p. 201-207

Subject/Index Terms

Filing Info

  • Accession Number: 00180027
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Sep 27 1978 12:00AM