Cellular Aluminum Particle-Air Detonation Based on Realistic Heat Capacity Model

ABSTRACT

Modeling aluminum (Al) particle-air detonation is extremely difficult because the combustion is shock-induced, and there are multi-phase heat release and transfer in supersonic flows. Existing models typically use simplified combustion to reproduce the detonation velocity, which introduces many unresolved problems. The hybrid combustion model, coupling both the diffused- and kinetics-controlled combustion, is proposed recently, and then improved to include the effects of realistic heat capacities dependent on the particle temperature. In the present study, 2D cellular Al particle-air detonations are simulated with the realistic heat capacity model and its effects on the detonation featured parameters, such as the detonation velocity and cell width, are analyzed. Numerical results show that cell width increases as particle diameter increases, similarly to the trend observed with the original model, but the cell width is underestimated without using the realistic heat capacities. Further analysis is performed by averaging the 2D cellular detonations to quasi-1D, demonstrating that the length scale of quasi-1D detonation is larger than that of truly 1D model, similar to gaseous detonations.

KEYWORDS:

• Al particle
• cellular detonation
• heat capacity
• hybrid model

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [Grant No. 11822202 and 91641130], the Fundamental Research Funds for the Central Universities of China [Grant No. 31020170QD087] and the Basic Research Plan of Natural Science in Shaanxi Province—General Project (Youth) [2019JQ-132].