Flame propagation behaviors and influential factors of TiH2 dust explosions at a constant pressure

Cheng, Yi; Meng, Xiangrui; Ma, Honghao; Liu, Shanghao; Wang, Quan; Shu, Chi‐Min; Shen, Zhaowu; Liu, Wenjin; Song, Shi-xiang; Fang, Hua

doi:10.1016/j.ijhydene.2018.06.145

Cited by 35 publications

(3 citation statements)

References 35 publications

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“…The shape and position of the diffusion flame depend on the fuel and oxygen mix, which is affected by the fluid dynamics of the fuel supplying part, buoyancy, and gravity. The movement of the molten sphere, the ejecting velocity of the volatile component of the PET–PEN from the molten part, and the external natural convective flow result in a complicated flame motion, as shown in Figure 13 b. Flame edge tracking has been commonly used in combustion studies to measure the flame spread rates or flame propagation velocities of gaseous fuels, 24 , 25 electrical wire burning, 26 , 27 solid fuels, 28 , 29 and flame retardants. 30 The position of the flame base and the bottom of the molten sphere were measured to calculate the flame spread rate from the negative slope of the graphs in Figure 13 during the quasi-steady periods.…”

Section: Resultsmentioning

confidence: 99%

Influence of the Foaming Process on the Burning Behavior of the PET–PEN Copolymer

2023

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The manufacturing process can modify the micromechanical structure, usefulness, and functionality of foams. Although one-step foaming is a simple process, controlling the morphology of the foams is difficult compared to the two-step processing method. In this study, we investigated the experimental differences in thermal and mechanical properties, particularly combustion behavior, between PET−PEN copolymers prepared by the two methods. With an increase in foaming temperature T f , the PET−PEN copolymers became more fragile, and the breaking stress of the one-step PET− PEN foamed at the highest T f was only 2.4% of that of the raw material. For the pristine PET−PEN, 24% of the mass was burned, leaving 76% as a molten sphere residue. The two-step MEG PET− PEN had only 1% of its mass remaining as a residue, whereas the onestep PET−PENs had between 41 and 55%. The actual mass burning rates were similar for all the samples except the raw material. The coefficient of thermal expansion of the one-step PET−PEN was about two orders of magnitude lower than that of the two-step SEG.

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Section: Resultsmentioning

confidence: 99%

Influence of the Foaming Process on the Burning Behavior of the PET–PEN Copolymer

2023

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“…Research on the propagation characteristics of coal dust explosions in confined space shows that coal dust explosion is a complex and extremely rapid physical and chemical conversion process [8][9][10][11]. After coal dust particles are rapidly oxidized and burned, the flame temperature is very high, which can reach 2300∼2500 K and the pressure can reach 0.7∼0.8 MPa in a short time.…”

Section: Introductionmentioning

confidence: 99%

Prediction Method of Coal Dust Explosion Flame Propagation Characteristics Based on Principal Component Analysis and BP Neural Network

Liu

Cai

Wang

et al. 2022

Mathematical Problems in Engineering

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To study the flame propagation characteristics of coal dust explosion, principal component analysis and BP neural network are used to predict the farthest distance and the maximum speed of flame propagation. Among the eight influencing factors of flame propagation characteristics, three principal components are extracted and named “the factor of volatility,” “the factor of intermediate diameter,” and “the factor of environmental temperature.” By using BP neural network, it is found that the minimum prediction error of the farthest distance of flame propagation is 2.4%, and the minimum prediction error of the maximum speed of flame propagation is 0.4%, which also proves the necessity of principal component analysis by comparing the prediction errors. The research results provide a theoretical method for predicting the flame propagation characteristics of coal dust explosion.

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“…When the liquid propellant explodes accidentally, there are mainly two harmful effects caused by explosion shock wave and thermal damage. The shock wave effect is one of the most important indicators for weighing the destructive force of the explosion on the target [16][17][18][19][20][21]. In the engineering practice, the safety technical measures, such as proper safety distance setting and isolated anti-explosion protection, are relatively vital techniques to ensure the safety of personnel and facilities during the production, storage and test of liquid propellants.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Damage Effects in the Deflagration Process of Typical Liquid Propellants

Sang

et al. 2022

Propellants Explo Pyrotec

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To study the damage effects caused by accidental deflagration of liquid propellants during production, storage, transportation and use, the information of the deflagration processes and the shock wave hazards of three typical liquid propellants under external flame stimulation were obtained by a high-speed camera and a shock wave pressure acquisition system. Additionally, in the same situation, the highest temperature of the surface fireball and the law of fireball of the thermal radiation were also studied by an infrared thermal imager and heat flux test system. High-speed video results showed that the fireball of DT-3 developed most violently of the three liquid propellants; anhydrous hydrazine took the second place and metallized gelled MMH was the weakest. The average TNT equivalents of 18 kg anhydrous hydrazine, 18 kg DT-3, 120 kg anhy-drous hydrazine and 120 kg DT-3 were 0.724, 0.629, 0.000375 and 0.0293 respectively. The peak values of thermal radiation flux were in the order of DT-3 > anhydrous hydrazine > metallized gelled methylhydrazine. The corresponding death radius in the accident was supposed to be 20-30 m. Experimental results indicated that package design pressure of liquid propellant had a significant effect on the intensity of the reaction response to the action of flame stimulation. Within a certain range, the package design pressure of liquid propellant should be appropriately reduced to improve its security in storage and use. The study provided a theoretical guidance for the explosion protection of liquid propellant in case of accidental deflagration.

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Flame propagation behaviors and influential factors of TiH2 dust explosions at a constant pressure

Cited by 35 publications

References 35 publications

Influence of the Foaming Process on the Burning Behavior of the PET–PEN Copolymer

Influence of the Foaming Process on the Burning Behavior of the PET–PEN Copolymer

Prediction Method of Coal Dust Explosion Flame Propagation Characteristics Based on Principal Component Analysis and BP Neural Network

Comparative Study on the Damage Effects in the Deflagration Process of Typical Liquid Propellants

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