Comparison of Experimental Data with Analytical Predictions (Including Wall Effect) for Three Supercavitating Hydrofoils.
Abstract
Three supercavitating hydrofoil section shapes were designed at the David W. Taylor Naval Ship R and D Center, using fully nonlinear theory. The foils was built and tested at the California Institute of Technology (C.I.T.), in order to obtain experimental verification of the design-method. This report compares the DTNSRDC predicted foil performance (including wall-effects) with the experimental data of C.I.T. Agreement is good for the lift and moment results, but only at cavitation numbers near or somewhat above the choked tunnel conditions (which nearly coincide with the design conditions). The drag coefficients are in not as good agreement. Cavity length was difficult to discern during the experiments, thus, only qualitative statements are made in the report on this aspect. The discrepancy in the drag results could be a consequence of the theory, indicating the necessity for further refinement. However, the difficulty in obtaining accurate two-dimensional drag measurements may have significantly contributed to the disagreement in the drag results. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1977
- Accession Number
- ADA047005
Entities
People
- Barry L. Fisher
- David W Taylor
- Elwyn S. Baker