Cavitation Mechanism and Performance Analysis of Toroidal Propeller

doi:10.12382/bgxb.2024.0623

Abstract

Abstract:

The toroidal propeller is a kind of novel propeller,of which the cavitation characteristics are not yet clear.A three-dimensional numerical model is established to analyze the cavity distribution and cavitation mechanism of toroidal propeller.The toroidal propeller are simulated based on the multiple reference frames method and the Schnerr-Sauer cavitation model,and the cavitation characteristics of toroidal propeller under different rotational speeds and advance coefficients are analyzed.The calculated results of the volume fraction of gas phase under different rotational speeds and advance coefficients show that the cavitation laws of the front and rear edges of toroidal propeller are very different,and the suction surface of the transition section is the most prone to cavitation.The cavitation of the front edge pressure surface always occurs earlier than that of the rear edge pressure surface,while the cavitations of the front and rear edge suction surfaces occur almost simultaneously.The research results can support the further improvement on the noise and hydrodynamic performances of toroidal propeller.

Key words: toroidal propeller, cavity distribution, cavitation characteristics, Schnerr-Sauer model

CLC Number:

U664.33

XIANG Yue, WANG Wenjie. Cavitation Mechanism and Performance Analysis of Toroidal Propeller[J]. Acta Armamentarii, 2025, 46(8): 240623-.

Figures/Tables 16

Fig.1 Computational model

Fig.2 The name of each part of toroidal propeller

Table 1 The main parameters of computational model

参数	环形螺旋桨	PPTC桨
直径D/mm	381	381
毂径比	0.34	0.3
轴距L/mm	60
桨叶数/对	3	5

Fig.3 Computational domain division

Table 2 Grid-independent analysis of toroidal propeller

编号	网格数量	最小尺寸/mm	加密区尺寸/mm	效率
1	8427400	1.2	8	0.424
2	9908978	1.2	5	0.431
3	13853315	0.8	5	0.471
4	18349290	0.8	3	0.473
5	22250716	0.5	3	0.473

Fig.4 Density plot of volumetric mesh

Table 3 Simulated results of open water efficiency of PPTC propeller

J	ETA试验值	ETA计算值	误差/%
0.6	0.4300	0.4295	-0.12
0.8	0.5512	0.5397	-2.09
1.0	0.6520	0.6753	3.57
1.2	0.7258	0.7619	4.97
1.4	0.7487	0.7318	-2.26

Table 4 Flow field parameter settings for cavitation properties calculation

n/(r·min^-1)	v_a/(m·s^-1)
n/(r·min^-1)	J=0.3	J=0.6
1000	1.9050	3.8100
1500	2.8575	5.7150
2000	3.8100	7.6200
2500	4.7625	9.5250
3000	5.7150	11.4300
3500	6.6675	13.3350
4000	7.6200	15.2400
4500	8.5725	17.1450

Fig.5 Cavity distribution of PPTC propeller for J=0.3

Fig.6 Cavity distribution of toroidal propeller for J=0.3

Fig.7 Cavity distribution of PPTC propeller for J=0.6

Fig.8 Cavity distribution of toroidal propeller for J=0.6

Fig.9 Cavitation of the pressure surface of toroidal propeller for J=0.3

Fig.10 Cavitation of the pressure surface of toroidal propeller for J=0.6

Fig.11 Cavitation of the suction surface of toroidal propeller for J=0.3

Fig.12 Cavitation of the suction surface of toroidal propeller for J=0.6

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