The Influence of Active Ventilation on Propeller Wake

doi:10.12382/bgxb.2024.0905

Abstract

Abstract:

In order to investigate the influence of bubbly flow on propeller wake,the wake dynamics characteristics of propellers in bubbly flow are numerically studied based on the SST k-ω DES turbulence model and volume fraction equation,and the sliding grid technique.The KP505 propeller flow numerical model is verified.A propeller wake evolution model is proposed based on the evolution mechanism of propeller wake in multiphase inflow.The results show that the proposed model can accurately simulate the evolution process of propeller wake and reveal the triggering mechanism of propeller wake instability.The radial ventilation position affects the strength and dissipation of the tip vortex and hub vortex of propeller.The ventilation at the axis causes the hub vortex to expand and connects the tip vortex to form a vortex ring in the far field.The ventilation position moves towards the wing tip,and the vortex system at the wing tip accelerates and rapidly dissipates.The results have certain reference value for the design and manufacturing of propellers.

Key words: air injection bubble, gas-liquid two-phase, propeller wake, instability mechanism, numerical analysis

WANG Zhibo, GU Jinjing, QIAN Haocheng. The Influence of Active Ventilation on Propeller Wake[J]. Acta Armamentarii, 2025, 46(9): 240905-.

Figures/Tables 19

Fig.1 Coupling setting of propeller and bubble

Table 1 Air injection setting

r/R	进速系数	通气质量流量/ (kg·s^-1)	通气流速/ (m·s^-1)
0	0.4	0	0
		0.0003	0.95
		0.001	3.18
		0.003	9.55
		0.005	15.92
		0.012	38.20

Table 2 Ventilation position setting

通气质量流量/ (kg·s^-1)	进速系数	r/R	通气口中心坐标/m
0.003	0.4	0	(0,0,0)
		0.2	(0,0.025,0)
		0.4	(0,0.05,0)
		0.6	(0,0.075,0)
		0.8	(0,0.1,0)
		1.2	(0,0.15,0)

Fig.2 Design of computational domain and mesh encryption

Table 3 Different grid schemes and grid independence verification

网格方案	叶片网格尺寸/H	边界层厚度/H	旋转体网格尺寸/H	交界面网格尺寸/H	网格数/10⁶	K_T	ΔK_T/%	10K_Q	ΔK_Q/%
1	0.0400	0.2000	0.0400	0.0800	1.79	0.2492	4.53	0.422	7.68
2	0.0141	0.0707	0.0141	0.0283	5.08	0.2407	0.96	0.409	4.36
3	0.0050	0.0250	0.0050	1.00%H	14.37	0.2398	0.59	0.401	2.32

Fig.3 The open water curve of KP505

Table 4 Volution of wake under the influence of water vapor mixing at different air injection flow rates

q/ (kg·s^-1)	J
q/ (kg·s^-1)	0.2	0.4	0.6	0.8
0
0.0003
0.0010
0.0030
0.0050
0.0120

Fig.4 The evolutionary relationship between air injection flow rates and wake condensation effect(J=0.4)

Fig.5 The attenuation relationship of vortex in the hub of the rear axis of propeller

Fig.6 Evolution of propeller bubble infiltration

Fig.7 Gas distribution behind the propeller(J=0.4)

Fig.8 Volume fraction of gas behind the propeller axis at different air injection flow rates

Fig.9 The stability of bubble agglomeration influenced by propeller hub vortex

Fig.10 Evolution of air injection pathways

Fig.11 Volume fraction of gas on the axis of the pipe

Fig.12 Inflow attribute of x/D=-0.2 surface

Fig.13 Evolution of wake under the influence of water vapor mixing at different air injection positions

Fig.14 The evolution relationship of tail vortex condensation effect at different air injection positions

Fig.15 Vortex at the rear axis of the propeller at different air injection positions

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