Modeling of Spray Distribution and Validation of Uniform Coating Technology for Light-initiated Explosives

doi:10.12382/bgxb.2024.1059

Abstract

Abstract:

To improve the precision of impact loads when applying loads via light-initiated explosives,the spray deposition distribution patterns of light-initiated explosives are studied using a specially designed spray coating system.The relationships among spray deposition efficiency,width,areal density distribution,and spraying distance at different spraying distances (10cm,15cm,and 20cm) are obtained.An equation describing the spray deposition distribution pattern of light-initiated explosives is obtained through fitting.The uniform spray coating on flat surfaces and the synchronous detonation verification are is experimentally studied based on the spray distribution model and spray superposition principle.The research results indicate that the spray distribution follows a pattern of being higher in the middle and lower on both sides.As the spraying distance increases,the effective spray width gradually widens,while the deposition efficiency decreases.The uniform spray coating on flat surfaces can be achieved by rationally planning the spray coating path.The maximum deviation between the measured areal density and the design value of the light-initiated explosive coating is 3%.The maximum asynchronous initiation time of light-initiated explosives is 8.52μs.This research lays a foundation for the future application of precise loading techniques for light-initiated explosives.

Key words: light-initiated explosive, high precision spraying, spray deposition distribution, spraying distance

CLC Number:

O384

DONG Pengju, XU Chang, WU Ke, SUI Yaguang, CHEN Bo, YAO Weibo, ZHANG Dezhi, XU Haibin. Modeling of Spray Distribution and Validation of Uniform Coating Technology for Light-initiated Explosives[J]. Acta Armamentarii, 2025, 46(9): 241059-.

Figures/Tables 19

Fig.1 Schematic diagram of spray coating system

Fig.2 Sampling experimental device for areal density of spray deposited coatings

Fig.3 Schematic diagram of spray deposition process

Table 1 Spraying parameters

参数	数值
涂料密度/(kg·m^-3)	810
扇面压力/kPa	100
雾化压力/kPa	70
喷涂速度/(m·s^-1)	0.1
喷涂距离/cm	10,15,20
喷涂遍数	60

Fig.4 Sampling plates with light-initiated explosive coatings

Fig.5 The relationship between the areal density and thickness of light-initiated explosives

Table 2 The thickness and bulk density of light-initiated explosives coatings with different areal densities

面密度/(mg·cm^-2)	厚度/μm	体密度/(mg·cm^-3)
9.03	131	0.69
12.6	168	0.75
12.7	180	0.71
13.69	185	0.74
15.83	208	0.76
19.01	269	0.71
22.49	317	0.71

Table 3 Mass flow rate of light-initiated explosives ejected from the spray gun nozzle

取样时刻	取样时间/s	质量/mg	质量流量/(mg·s^-1)
喷涂前	30	1602.4	53.41
喷涂30次	30	1573.9	52.46
喷涂后	30	1573.6	52.45

Table 4 Deposition mass and efficiency of light-initiated explosives on rectangular sampling plates

喷涂距离/cm	喷雾沉积宽度/cm	沉积质量/mg	沉积效率
10	20	587.57	0.907
15	26	470.7	0.726
20	29	343.3	0.530

Fig.6 Fitted curves of spray deposition width and deposition efficiency versus spraying distances

Fig.7 experimental sampling values and fitted curve at a spraying distances of 10cm,15cm and 20cm

Table 5 Deposition mass and efficiency of light-initiated explosives on rectangular sampling plates

喷涂距离/cm	拟合质量/mg	沉积质量/mg	η
10	574.34	587.57	0.977
15	460.08	470.7	0.977
20	335.64	343.3	0.977

Fig.8 Relationship between spraying path interval and coating thickness variance

Fig.9 Spraying paths and layout diagram for flat panel spray coating test specimens

Fig.10 Calculated value of the cross-sectional area density distribution after superposition

Fig.11 Uniform sprayining test panel

Fig.12 Areal density distribution of sampling sections with explosive coatings

Fig.13 Schematic diagram of initiating light-initiated explosives with high-intensity pulsed flash

Fig.14 Explosive coatings after initiation and detonation time at measuring points

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