ESTIMATION OF UNSTEADY CAVITATION ON PROPELLER BLADES AS A BASE FOR PREDICTING PROPELLER INDUCED PRESSURE FLUCTUATIONS

In order to calculate the pressure fluctuations induced by a cavitating propeller, the cavity geometry on the propeller blades must be known as a function of time. Purely theoretical calculation thereof needs application of unsteady lifting surface theory including effect of unsteady cavitation which is, however, far beyond the analytical formulation. In this study, attempts were made to estimate the unsteady cavitation using available theoretical methods (an unsteady theory on non-cavitating propeller and an approximate method of lift equivalence for determination of cavity length). As a result, the unsteady cavitation on the blades was found to be estimated by life equivalence method with some empirical factors obtained by the observation of cavity extent and the measurement of cavity thickness. The pressure fluctuation calculated by thus obtained cavity geometry turned out to be about four times as large as the measured values. Multiplying factor 1/4 with calculated pressure due to unsteady cavity, the correlation between the calculated and the measured total pressure fluctuations was found to be fairly good.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/05148499
• Corporate Authors:

  Society of Naval Architects of Japan

  15-16, Toranomon, 1-chome, Minato-ku
  Tokyo,   Japan 
• Authors:
  • Hoshino, T
• Publication Date: 1980-12

Media Info

• Features: References;
• Pagination: p. 33-44
• Serial:
  • Journal of the Society of Naval Architects of Japan
  • Volume: 148
  • ISSN: 0514-8499

Subject/Index Terms

• TRT Terms: Atmospheric pressure; Cavitation (Mechanics); Cavitation erosion; Force; Pressure; Propeller blades; Propellers
• Uncontrolled Terms: Pressure distribution
• Old TRIS Terms: Cavitating propellers; Cavity dynamics; Model testing; Pressure fluctuations; Propeller induced forces
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00330516
• Record Type: Publication
• Files: TRIS
• Created Date: May 21 1981 12:00AM