Effect of Particle Injection Velocity on Aluminum Powder/air Two-phase Rotating Detonation Waves

doi:10.12382/bgxb.2022.0895

Abstract

Abstract:

The effect of particle injection velocity on the two-phase flow field of a rotating detonation engine fueled by aluminum powder and air is studied. The two-dimensional rotating detonation combustion for the aluminum particles with the injection temperature of 300K and the high temperature air with the total inflow temperature of 900K is simulated by using the discrete phase model, one-step surface reaction including kinetic/diffusion-limited rate surface combustion model and multiple-step gas phase decomposition reaction model and considering the devolatilization of incompletely unburned particles. Results show that the particle injection velocity near the inlet is lower than that of air, which results in an incomplete overlap between the air triangle and the particle triangle. As the particle injection velocity increases from 1m/s to 100m/s, the detonation velocity and temperature first decreases and then increases. There is a significant temperature difference between particles and air injected into the combustion chamber, which leads to unstable detonation wave propagation. The detonation wave has the best stability when the particle injection velocity is 70m/s.

Key words: rotating detonation wave, particle injection velocity, gas-solid two-phase flow, aluminum powder, propagation characteristic

CLC Number:

V321.22

LI Shiquan, ZHU Wenchao, SUN Fangping, WANG Yuhui, WANG Jianping. Effect of Particle Injection Velocity on Aluminum Powder/air Two-phase Rotating Detonation Waves[J]. Acta Armamentarii, 2024, 45(4): 1148-1157.

Figures/Tables 15

Fig.1 A two-dimensional model of RDE

Table 1 Calculation parameters of particle surface reaction[26]

计算参数	数值
ρ_p0/(kg·m^-3)	2719
H_reac/(J·kg^-1)	3.1×10⁷
c_p,_p/(J·kg^-1·K^-1)	871
S_b	0.89
C_i/(kg·m^-2·s^-1·Pa^-1)	5.0×10^-12
C_j/(kg·m^-2·s^-1)	200
E_k/(J·kmol^-1)	9.55×10⁷

Table 2 Calculation parameters of multi-step reverse decomposition reactions[27-28]

编号	分解反应	A_r	β	E_r/(J·kmol^-1)
R2	Al₂O₃⇔Al₂O₂+O⁺	3.0×10¹⁵	0	4.0875×10⁸
R3	Al₂O₂⇔2AlO	1.0×10¹⁵	0	4.9352×10⁸
R4	Al₂O₂⇔Al₂O+O⁺	1.0×10¹⁵	0	4.3638×10⁸
R5	Al₂O⇔AlO+Al	1.0×10¹⁵	0	5.5766×10⁸
R6	O⁺+O⁺+M⇔O₂+M	6.17×10¹⁵	-0.5	0

Fig.2 Temperature contours with different grid sizes for vp=10m/s

Table 3 Parameters of RDWs with different cell sizes for vp=10m/s

网格尺寸/mm	v_D/(m·s^-1)
网格尺寸/mm	计算值	实验值^[29]	相对误差/%
0.40	1590	1480	7.43
0.30	1600		8.10
0.25	1610		8.78
0.20	1520		2.70

Fig.3 Contours of flow field for vp=1m/s

Fig.4 Profiles of the axial velocity of air and particles along x axis at y=0.1mm for vp=1m/s

Fig.5 Contours of DPM concentration for vp =1m/s

Fig.6 DPM concentration distribution along y axis at x=4.2cm for vp=1m/s

Fig.7 Contours of local equivalence ratios at different particle injection velocities

Table 4 Parameters of RDW at different particle injection velocities

v_p/(m·s^-1)	$φ ¯ L$	v_D/(m·s^-1)	平均压力/MPa	平均温度/K
1	1.426	1530	2.54	4076
10	1.405	1520	2.58	4063
40	1.394	1490	2.61	4042
70	1.369	1460	2.54	4036
100	1.328	1480	2.51	4048

Table 4 Parameters of RDW at different particle injection velocities

v_p/(m·s^-1)	$φ ¯ L$	v_D/(m·s^-1)	平均压力/MPa	平均温度/K
1	1.426	1530	2.54	4076
10	1.405	1520	2.58	4063
40	1.394	1490	2.61	4042
70	1.369	1460	2.54	4036
100	1.328	1480	2.51	4048

Fig.8 Pressure traces at monitor point(10cm, 0.4cm) for vp=100m/s

Fig.9 Temperature contours of air and particles in the filling areas for vp=100m/s

Fig.10 Local enlarged views of temperature and pressure at different moments for vp=100m/s

Fig.11 Variations of Sp and Sf at different particle injection velocities

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