Experimental Study of Detonation Wave Propagation Characteristics of Anthracite Pulverized Coal with Different Physical Properties under Ethylene/oxygen Atmosphere

doi:10.12382/bgxb.2023.0022

Abstract

Abstract:

The continuous rotating detonation engine with coal powder as fuel has the advantages of high thermal efficiency of detonation cycle, high volumetric calorific value of powder fuel and adjustable flow rate, etc. However, the operating characteristics of the engine are influenced by the physical properties of coal powder. In order to study the effects of different physical properties of pulverized coal powder on the propagation characteristics of detonation wave, the gas-solid two-phase detonation experiments was conducted with three types of porous 5μm, porous 40μm and flake 5μm anthracite pulverized coals, at different equivalent ratios (0.7, 1.0, 1.3, 1.5). A test setup of constant volume combustion bomb was designed with a high energy ignition system at an initial pressure of 100kPa. In the test cases of detonation with porous 5μm anthracite fuel, the detonation wave speed and pressure continue to increase with the increase in the equivalent ratio, and the maximum detonation wave propagation speed and pressure are achieved when equivalent ratio is 1.5. In the test cases of detonation with porous 40μm pulverized coal fuel, with the increase in the equivalent ratio in the range of 0.7-1.3, the detonation wave speed continues to increase, and when the equivalent ratio is increased to 1.5, the detonation wave speed begins to decrease, but the detonation pressure increases. The detonation wave speed with 5μm porous pulverized coal fuel is better than that with 40μm pulverized coal at the same equivalent ratio ; the detonation characteristics with flake 5μm pulverized coal fuel are the worst and suppress detonation at high equivalent ratio.

Key words: powder continuous rotating detonation engine, detonation, coal particle, direct initiation, propagation characteristics, gas-solid two-phase detonation

CLC Number:

O381

ZHANG Feng, LUO Yongchen, XIAO Bowen, NI Xiaodong, ZHENG Quan, WENG Chunsheng, XU Han. Experimental Study of Detonation Wave Propagation Characteristics of Anthracite Pulverized Coal with Different Physical Properties under Ethylene/oxygen Atmosphere[J]. Acta Armamentarii, 2024, 45(5): 1663-1672.

Figures/Tables 11

Fig.1 Schematic diagram of the device

Fig.2 Schematic diagram of nozzle

Fig.3 ZND model of pulverized coal detonation

Fig.4 SEM photograph of pulverized coal

Fig.5 Particle size distribution of pulverized coal

Table 1 Composition information of two kinds of pulverized coal

参数	片状	多孔状
燃点/℃	556	574
密度/(g·cm^-3)	0.956	0.774
热容率/(J·g^-1·K^-1)	0.856	0.824
N/%	0.000	0.300
C/%	97.00	94.64
H/%	0.319	0.912
S/%	0.221	0.549
总水分/%	5.95	2.53
灰分/%	0.43	0.21
挥发分/%	2.12	1.73

Table 2 Experimental conditions

序号	燃料	氧化剂	当量比
序号	燃料	氧化剂	煤粉当量比	乙烯当量比	总当量比
1	乙烯+煤粉	O₂	0	0.5	0.5
2			0.2	0.5	0.7
3			0.5	0.5	1
4			0.8	0.5	1.3
5			1	0.5	1.5

Fig.6 Shock wave velocity and chemical reaction zone trends under the action of upper critical detonation energy[24]

Fig.7 Signal-time curves of pressure sensor and ion probe at P1

Fig.8 Variation of detonation wave velocity with equivalent ratio for different types of pulverized coal

Fig.9 Variation of the pressure of different types of pulverized coal detonation wave with the equivalent ratio

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