Numerical Simulation of the Expansion Characteristics of Plasma Jet in Gradually Expanding Liquid-filled Chamber

doi:10.12382/bgxb.2024.0034

Abstract

Abstract:

The presence of positive feedback mechanism affecting the stability of combustion process as the plasma jet expands in a liquid media limits its further practical application.In order to explore the expansion characteristics of plasma jet in an integrated liquid working medium,a two-dimensional axisymmetric unsteady mathematical physical model of the interaction between plasma jet and liquid working medium is established and verified.A four-stage gradually expanding liquid-filled chamber structure is designed,and the expansion characteristics of plasma jet in liquid propellant LP1846 are numerically analyzed.The spatial and temporal distributions of the characteristic parameters,such as pressure,velocity and temperature,in the plasma jet field were obtained.The results show that the four-stage gradually expanding liquid- filled chamber structure can be used to enhance the radial expansion ability of plasma jet in the chamber and the radial influence range in the high pressure and temperature region of plasma jet head,so as to control the axial expansion speed and pulsation of plasma jet.The liquid propellant LP1846 with high viscosity and density is used to simulate the working medium,The gradually expanding liquid-filled chamber structure can slow down the axial expansion speed of plasma jet,effectively inhibits the Kelvin-Helmholtz instability and Taylor instability,and helps to enhance the expansion stability of plasma jet.The near-field pressure and temperature fluctuate due to the alternating generation of expansion and compression waves near the nozzle.

Key words: plasma jet, gradual boundary expansion, liquid working medium, Kelvin-Helmholtz instability, Taylor cavity

CLC Number:

TJ399

JIA Shuxiang, YU Yonggang. Numerical Simulation of the Expansion Characteristics of Plasma Jet in Gradually Expanding Liquid-filled Chamber[J]. Acta Armamentarii, 2025, 46(4): 240034-.

Figures/Tables 17

Fig.1 Experimental observation system[18]

Fig.2 Pulse-forming network

Fig.3 Schematic diagram of computational domain

Fig.4 Comparison of calculated and measured displacements of Taylor cavity head in axial coordinates

Table 1 Numerical comparison of calculated and measured displacements of Taylor cavity head in axial coordinates

时间/ms	实测值/mm	计算值/mm	误差/%
1	25.10	25.22	0.44
2	46.90	47.02	0.26
3	59.24	58.77	0.79
4	68.71	69.06	0.51
5	74.34	74.93	0.79

Fig 5 Schematic diagram of computational domain

Table 2 Structural parameters of four-stage gradually expanding liquid-filled chamber

参数	级数
参数	1	2	3	4
直径/mm	15	25	35	45
高度/mm	20	20	20	40

Fig.6 Mesh independence verification

Table 3 Physical property parameters of liquid working medium[22]

液体工质	C_p/ (J·kg^-1·K^-1)	ρ/ (g·cm^-3)	η/ (Pa·s)	λ/ (W·m^-1·K^-1)
LP1846	4180	1.43	6.31×10^-3	0.20
水	4182	1.00	1.79×10^-5	0.24

Table 4 Extended sequence diagram of plasma jet in different liquid working media

液体工质	t/ms
液体工质	1	2	3	4	5
LP 1846
水

Fig.7 Axial expansion displacements of plasma jet in different liquid working media

Table 5 Pressure variation of plasma jet as it expands in different liquid working media

液体工质	t/ms
液体工质	1	2	3	4	5
LP 1846
水

Fig.8 Pressurevariation diagram of plasma jet in different liquid working media

Table 6 Axial velocity cloud image of plasma jet expansion in different liquid working media

液体工质	t/ms
液体工质	1	2	3	4	5
LP 1846
水

Table 7 Radial velocity cloud image of plasma jet expansion in different liquid working media

液体工质	t/ms
液体工质	1	2	3	4	5
LP 1846
水

Table 8 Temperature cloud image of plasma jet as it expands in different liquid working media

液体工质	t/ms
液体工质	1	2	3	4	5
LP 1846
水

Fig.9 T-s diagram of plasma jet in different liquid working media(t=2ms)

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