Effects of Intake Flow Rate on Powder Fluidization and Conveying in a Piston-Type Powder Feeding Device

doi:10.12382/bgxb.2022.0582

Abstract

Abstract:

A built-in intake channel powder feeding device is designed for the piston-driven powder fuel supply system, and the action of the multi-physical coupling of the gas-powder-moving wall is established. Numerical simulations are carried out to investigate the variation of intake flow rate on powder fluidization and conveying characteristics using the Eulerian-Eulerian two-fluid model. The results show that gas-solid interface fluctuations mainly occur in the upper part of the intake channel. With an increasing intake flow rate, both the gas phase distribution range and the area covered by the powder layer (Powder volume fraction ε_p=0.1) increase. The peak granular temperature at different intake flow rates is mainly located near the two-phase throat. The gas-solid two-phase velocity at the head position of the conical convergence section and the two-phase throat increases with increasing intake flow rate, while the area-averaged powder volume fraction decreases. When the mass flow rate ratio is 0.10%, a sudden spurt phenomenon occurs in the outlet powder flow during the late conveying stage, while the pressure in the powder storage tank drops abruptly. When the mass flow rate ratio is 0.33%, the outlet powder flow rate and pressure fluctuations in the powder storage tank are relatively stable. For mass flow rate ratios ranging from 0.56% to 1.25%, both outlet powder flow rate and pressure in the powder storage tank exhibit similar fluctuation patterns, albeit with larger amplitudes. The findings of the study provide a theoretical reference for the development of an efficient powder conveying device.

Key words: powder engine, fluidization and conveying, numerical simulation, gas-solid two-phase flow, built-in intake structure, piston-type feeding device

CLC Number:

V435

REN Guanlong, SUN Haijun, XU Yihua. Effects of Intake Flow Rate on Powder Fluidization and Conveying in a Piston-Type Powder Feeding Device[J]. Acta Armamentarii, 2023, 44(10): 2906-2919.

Figures/Tables 18

Fig.1 Configuration of a powder storage tank

Table 1 Simulation cases

工况	活塞速度/ (mm·s^-1)	$m · p t$ / (kg·s^-1)	m_i/ (kg·s^-1)	MFRR/%
1	70	0.296	0.0003	0.10
2	70	0.296	0.0010	0.33
3	70	0.296	0.0017	0.56
4	70	0.296	0.0024	0.79
5	70	0.296	0.0031	1.02
6	70	0.296	0.0038	1.25

Table 1 Simulation cases

工况	活塞速度/ (mm·s^-1)	$m · p t$ / (kg·s^-1)	m_i/ (kg·s^-1)	MFRR/%
1	70	0.296	0.0003	0.10
2	70	0.296	0.0010	0.33
3	70	0.296	0.0017	0.56
4	70	0.296	0.0024	0.79
5	70	0.296	0.0031	1.02
6	70	0.296	0.0038	1.25

Table 2 Simulation parameters

参数	数值
d_s/mm	0.02
ε	0.55
ε_max	0.63
g/(m·s^-2)	9.81
μ_g/(10^-5Pa·s)	1.72
ρ_s/(kg·m^-3)	2719
虚拟质量系数	0.5
e	0.9
粉末储箱内压强环境/Pa	101325

Fig.2 Structured hexahedral meshing of the powder storage tank

Fig.3 Grid independency test

Fig.4 Verification of the numerical calculation model

Table 3 Instantaneous flow pattern at the central section (z=0m) changes with the intake flow rate

Fig.5 Area and spatial distribution of powder layers

Fig.6 Velocity distribution for solid and gas phases at different axial positions

Fig.7 Powder volume fraction variation and powder contour distribution

Fig.8 Granular temperature distribution at different times

Fig.9 Variation of outlet powder flow rate with time

Fig.10 Comparison of standard deviations of outlet powder flow rates

Fig.11 Comparison of average powder flow rates at the outlet with the theoretical values

Fig.12 Solid-gas ratio distribution under different cases

Fig.13 Comparison of relative errors of solid-gas ratio under different cases

Fig.14 Variation of pressure in the tank with time under different cases

Fig.15 Variation of outlet gas flow rate with time

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