A Preliminary Design Theory for Polyphase Impellers in Unbounded Flow.
Abstract
The main role of preliminary design for supercavitating propellers is to supply the basic data for the final design, such as: the hydrodynamic pitch angle, the radial load distributions, the approximate cavity length and the distribution of cavity-source strengths which will help determine the three-dimensional cavity-source distribution. For this purpose, the effective use of supercavitating cascade theory with lifting-line theory is discussed together with influences of neighboring cavities on cavity drag, the hydrodynamic pitch angle, inflow retardation and the optimum pitch distribution of the propeller. The computer program developed here is applied to several existing propeller models. The results show that propeller efficiency is predicted well but pitch distribution is a little larger than for the model. The results are analyzed and compared with the results of a lifting-surface design method which has been developed recently for use with the present preliminary design method. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1982
- Accession Number
- ADA110131
Entities
People
- B. Yim