Control Mechanism of Vortex Generator to the Flow Noise of Wing-plate Junction

doi:10.12382/bgxb.2022.0389

Abstract

Abstract:

To solve the problem of flow noise control in wing-plate junction, seven kinds of vortex generators with different heights and spacings were designed, and the noise reduction effect was studied by combining numerical simulation and experiment. Since it is very difficult to directly carry out the vortex generator noise reduction test and verification in water, numerical simulation and experimental verification in the air were firstly selected to analyze and confirm the feasibility of the vortex generator scheme. Taking SUBOFF model as the research object, the numerical method of large eddy simulation was used to solve the acoustic analogy equation with the result of unsteady flow as the sound source term, and the flow noise result was obtained. Through the comparison of different vortex generator schemes, the control effect of two main parameters, the height and spacing of vortex generators, on the main source of the wing-plate junction flow noise, namely, horseshoe vortex, was analyzed. Then the vortex generator scheme with the best noise reduction effect for SUBOFF model was identified. This was verified by the anechoic wind tunnel model test. It is proved that the proposed vortex generator scheme is feasible to reduce the flow noise in wing-plate junction, which lays a foundation for further investigation in the water.

Key words: flow noise control, vortex generator, anechoic wind tunnel test, large eddy simulation

CLC Number:

TB535

LI Dingyuan, FANG Bin, LI Yiming, LIU Wenxi. Control Mechanism of Vortex Generator to the Flow Noise of Wing-plate Junction[J]. Acta Armamentarii, 2023, 44(8): 2404-2413.

Figures/Tables 21

Fig.1 Calculation flow chart

Fig.2 Computational domain

Fig.3 Local mesh refinement diagram of vortex generator

Fig.4 A cutaway view of the sound transmission zone

Fig.5 Mesh division of sound propagation zone

Fig.6 Diagram of vortex generator parameters

Table 1 Vortex generator parameters of control group 1

编号	h	L_VG
h-0.050H	0.050H	0.25H
h-0.075H	0.075H	0.25H
h-0.100H	0.100H	0.25H
h-0.125H	0.125H	0.25H

Table 2 Vortex generator parameters of control group 2

编号	h	L_VG
L_VG-0.225H	0.075H	0.225H
L_VG-0.250H	0.075H	0.250H
L_VG-0.275H	0.075H	0.275H
L_VG-0.300H	0.075H	0.300H

Fig.7 Velocity field cloud map

Fig.8 Pressure field cloud map

Table 3 Coordinates of sound field measuring points

测点	x/mm	y/mm	测点	x/mm	y/mm
1	-500	2000	5	-500	3000
2	0	2000	6	0	3000
3	500	2000	7	500	3000
4	1000	2000	8	1000	3000

Fig.9 Simulation results of the total sound level of each measuring point versus the x-coordinate in the scheme group 1

Fig.10 Velocity field cloud map

Fig.11 Pressure field cloud map

Fig.12 Simulation results of the total sound level of each measuring point versus the x-coordinate in the scheme group 2

Fig.13 Model installation drawing

Fig.14 Layout of survey points

Fig.15 On-site layout of sound pressure measuring points

Fig.16 Installed vortex generator

Fig.17 Test results of the total sound level of each measuring point versus the x-coordinate in the scheme group 1

Fig.18 Test results of the total sound level of each measuring point versus the x-coordinate in the scheme group 2

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