Deflagration-to-Detonation Characteristics and Detonation Wave Structure of the Flake Aluminum Powder–Air Mixture

IF 0.9 4区工程技术 Q4 ENERGY & FUELS

Combustion, Explosion, and Shock Waves Pub Date : 2023-11-21 DOI:10.1134/s0010508223050143

Q. Jing, D. Wang, C.-L. Shi, Q.-M. Liu, Y. Shen, Z.-S. Wang, C.-Q. Liu, Z. Yang, Z.-L. He, X. Chen, S.-Z. Li, J.-X. Huang

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Abstract

The explosion process of the flake aluminum powder–air two-phase flow is experimentally studied in a large-scale long straight horizontal tube with a length of 32.4 m and an inner diameter of 0.199 m. The deflagration-to-detonation transition (DDT) of the aluminum powder–air mixture is analyzed after being ignited by a 40-J electric spark, and the DDT of the mixture at different mass concentrations is compared. The results show that self-sustained detonation can be achieved in the range of 286–532 g/m³ of the flake aluminum powder concentration, and the DDT process of the aluminum powder–air mixture at the concentration of aluminum particles 409 g/m³ (optimal concentration) is analyzed in detail. The detonation velocity and detonation pressure at the optimal concentration are 1690 m/s and 58 bar, respectively. During the self-sustained detonation stage, the detonation overpressure of the multiphase fuel–air mixture exhibits a typical constant oscillation characteristic, while the detonation velocity remains stable. In addition, a double-headed mode helical detonation phenomenon is observed in the detonation wave front of the aluminum powder–air mixture. The structure of the detonation wave, the flow field parameters, and the interaction between the shock wave and the three-wave point trajectory are analyzed. The detonation cell size at the optimal concentration is approximately 486 mm.

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片状铝粉-空气混合物的爆燃爆轰特性及爆轰波结构

摘要在长32.4 m、内径0.199 m的大型长直水平管中，对片状铝粉-空气两相流的爆炸过程进行了实验研究。分析了40 j电火花点燃后铝粉-空气混合物的爆燃-爆轰过渡(DDT)，并比较了不同质量浓度下的DDT。结果表明，片状铝粉浓度在286 ~ 532 g/m3范围内可实现自续爆轰，并详细分析了铝颗粒浓度为409 g/m3(最佳浓度)时铝粉-空气混合物的滴滴涕过程。最佳浓度下爆速为1690 m/s，爆压为58 bar。在自持爆轰阶段，多相燃料-空气混合气的爆轰超压表现出典型的恒定振荡特征，而爆轰速度保持稳定。此外，在铝粉-空气混合物爆轰波前观察到双头型螺旋爆轰现象。分析了爆震波的结构、流场参数以及激波与三波点轨迹的相互作用。在最佳浓度下，爆震池尺寸约为486mm。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Combustion, Explosion, and Shock Waves 工程技术-材料科学：综合

CiteScore

1.60

自引率

16.70%

发文量

审稿时长

5.7 months

期刊介绍： Combustion, Explosion, and Shock Waves a peer reviewed journal published in collaboration with the Siberian Branch of the Russian Academy of Sciences. The journal presents top-level studies in the physics and chemistry of combustion and detonation processes, structural and chemical transformation of matter in shock and detonation waves, and related phenomena. Each issue contains valuable information on initiation of detonation in condensed and gaseous phases, environmental consequences of combustion and explosion, engine and power unit combustion, production of new materials by shock and detonation waves, explosion welding, explosive compaction of powders, dynamic responses of materials and constructions, and hypervelocity impact.