THE VALIDATION OF MODEL TEST METHOD FOR PROPELLER CAVITATION NOISE PREDICTION

Abstract

The propeller cavitation noise of commercial ships has been predicted from experimental results obtained at the large cavitation tunnel in KRISO (Korea Research Institute of Ships & Ocean engineering). The model tests were performed in accordance with the KRISO standard procedure. The procedure is composed of reproduction of noise source (propeller cavitation), noise measurement, post processing and scaling. The validation of the scaling method is very important to estimate the full-scale source levels accurately from the model scale results. A series of measurements were carried out under the test conditions according to the different flow speeds. The scaled results have the good agreement over the entire frequency range. The full-scale noise measurements have been carried out for the same full-scale ships to validate the standard scaling method. This paper shows that the predicted results from the model test agree quite closely with the results from full-scale measurement.