Time-evolution characteristics of flash radiation of gasified aluminum in aluminum-aluminum hypervelocity impact

DONG Wenpu; DU Xuefei; SHI Anhua; MA Zhaoxia

doi:10.11729/syltlx20230077

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DONG W P, DU X F, SHI A H, et al. Time-evolution characteristics of flash radiation of gasified aluminum in aluminum-aluminum hypervelocity impact[J]. Journal of Experiments in Fluid Mechanics, doi: 10.11729/syltlx20230077.

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Time-evolution characteristics of flash radiation of gasified aluminum in aluminum-aluminum hypervelocity impact

Hypervelocity Aerodynamics Institute of China Aerodynamics Research and Development Center, Mianyang　621000, China

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Received Date: May 24, 2023
Revised Date: July 26, 2023
Accepted Date: August 13, 2023
Available Online: November 12, 2023

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Abstract

Flash radiation is one of the typical phenomena produced in hypervelocity impacts. The study of the radiation mechanisms and evolution law of the impact flash is important for building the similarity relationship between the different scales and probing the dynamics of the hypervelocity impact. In the low pressure atmosphere, the flash radiation mechanisms in aluminum-aluminum hypervelocity impacts are multiplex. One of the radiation processes standing for tens microsecond duration may result from the ablation of tiny fragments. Analysis of impact experiments shows that the characteristics of the processes are close to with the description of the Taylor point explosion model, but further study of the radiation distribution is still lacking. In this paper, the evolution characteristics of the impact flash produced in hypervelocity impact are discussed by considering the effect of the radiation transfer in the impact products. It is found that there exists a peak structure in the time evolution of the radiation intensity, which presents a proportional law showing that the position of the radiation peak depends on the energy and density of the wave shock. The proportional law can be used to establish the relation between the chamber pressure and the radiation peak time of the shock wave. In addition, this work puts forward an approximate solution of the radiation evolution, which is derived from the radiation transfer theory and shows agreement with the results detected by experiments. The consistent results indicate the tens-microsecond-standing peak appeared in the impact flash is generated by the expansion of the shock wave, and the radiation intensity depends mainly on the expansion area and the dynamical evolution of the states of the gas distributed in the shock wave. It provides a theoretical reference for the research of the evolution law and the phenomena of the hypervelocity impact flash.
- hypervelocity impact,
- impact flash,
- radiation transfer,
- radiation intensity,
- time-evolution,
- gasified aluminum

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Time-evolution characteristics of flash radiation of gasified aluminum in aluminum-aluminum hypervelocity impact

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