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| Determination of Propeller Cavitation Initial Inception and Numerical Analysis of the Inception Bucket |
| YANG Qiong-Fang-a, WANG Yong-Sheng-a, ZHANG Zhi-Hong-b |
| (a. College of Naval Architecture and Marine Power; b. College of Science, Naval University of Engineering, Wuhan 430033, China) |
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Abstract To apply the cavitation multiphase simulation for propeller cavitation inception and inception bucket prediction, the improved Sauer cavitation model and modified shear stress transport turbulence model were used to predict the NSRDC 4381 propellers back and face sheet cavitation inception, tip vortex cavitation inception and inception bucket bottom line characteristics. A rule to determine the cavitation inception was presented printed as ‘when σ>σi, the pressure coefficient of the tip blade section is unchangeable and its application region on the bucket was limited also. Based on it, the inception bucket was partitioned more nicely from traditional three regions to five at last so to depict the blade cavitation stage under different conditions more precisely. The results show that, under design and nondesign conditions, the predicted inception cavitation indexes of the back and faces blade section all agree well with the experiment. The simulated tip vortex cavitation inception represents the phenomenon of local tip vortex and leading edge tip vortex combination, and verifies the reasonableness of using the sheet cavitation inception curves of 07 R section on the back and 04 R section on the face to stand for the back and faces visual tip vortex inception respectively. The determination rule is valid for both back and face sheet cavitation region up the bottom line on the bucket. The region under the bottom line on the bucket can be partitioned as back sheet cavitation lying 03 R to tip on the blade surface and back and face sheet cavitation existing simultaneously in addition, so to sever the engineering better for using the five regions to depict the propeller cavitation and calculate the cavitation ship speed.
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Received: 04 April 2011
Published: 30 March 2012
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