Influence of incident angle on precursor wave characteristics at specific thermal-layer temperature

LI Qi; CHENG Shuai; LIU Wenxiang; JIN Long; TONG Nianxue; ZHANG Dezhi

doi:10.11883/bzycj-2023-0114

Volume 44 Issue 7

Jul. 2024

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LI Qi, CHENG Shuai, LIU Wenxiang, JIN Long, TONG Nianxue, ZHANG Dezhi. Influence of incident angle on precursor wave characteristics at specific thermal-layer temperature[J]. Explosion And Shock Waves, 2024, 44(7): 073202. doi: 10.11883/bzycj-2023-0114

Citation:

LI Qi, CHENG Shuai, LIU Wenxiang, JIN Long, TONG Nianxue, ZHANG Dezhi. Influence of incident angle on precursor wave characteristics at specific thermal-layer temperature[J]. Explosion And Shock Waves, 2024, 44(7): 073202. doi: 10.11883/bzycj-2023-0114

Citation:

LI Qi, CHENG Shuai, LIU Wenxiang, JIN Long, TONG Nianxue, ZHANG Dezhi. Influence of incident angle on precursor wave characteristics at specific thermal-layer temperature[J]. Explosion And Shock Waves, 2024, 44(7): 073202. doi: 10.11883/bzycj-2023-0114

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Influence of incident angle on precursor wave characteristics at specific thermal-layer temperature

doi: 10.11883/bzycj-2023-0114

National Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xiʼan 710024, Shaanxi, China

Received Date: 2023-04-03
Rev Recd Date: 2024-05-13

Available Online: 2024-05-14

Publish Date: 2024-07-15

Abstract

Abstract

An intense explosion in the air releases heat radiation to form a thermal layer on the earth’s surface, and the shock wave propagates faster when it enters the thermal layer, forming a precursor wave. The incidence angle is an important factor affecting the characteristics of the precursor wave, but at present, most of the related work depends on theoretical derivation, and the experimental research is few. The influence of the incident angle on the precursor wave formation at 300 ℃ is studied using an explosion wave simulation shock tube platform. A thick iron plate is heated to 300 ℃ and fixed in the shock tube test section, the surface of which produces a thermal layer of 1 cm thick. The interaction between the shock wave generated by the shock tube and the thermal layer is captured by a high-speed camera. The influence of different incident angles on the precursor wave is studied. A numerical simulation model is established based on the experimental configuration. First, a complete axial symmetric shock tube model is established, and a data monitoring point is set at the position corresponding to the pressure measurement point in the model. Then, a plane model is built. The data of total pressure, static pressure, and total temperature calculated in the first step are the input, and the cloud diagram and pressure curve at the measuring point of the model are the output. The results show that the critical angle range of the precursor wave is consistent with the theoretical results. The greater the angle of incidence, the greater the distance of the precursor wave over the Mach stem, and the earlier the arrival time. The precursor wave will lead to a decrease in the peak overpressure, and as the incident angle increases, the decrease degree of overpressure peak increases first and then decreases. Overall, the peak dynamic pressure increases with the incident angle. When the incident angle reaches a certain threshold, the peak dynamic pressure begins to fluctuate in a certain range, the reason is that the peak arrival time of airflow density and particle velocity are different. The increase degree of dynamic pressure impulse increases with the increase of incident angle.
- precursor shock of thermal layer,
- incident angle,
- critical angle,
- pressure characteristic

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References(16)

References

[1]	GLASSTONE S, DOLAN P J. The effects of nuclear weapons: TID-28061 [R]. 3rd ed. Washington: Department of Defense, 1977.
[2]	ARTEM’EV V I, BERGEL’SON V I, MEDVEDYUK S A, et al. Amplification of intense blast pressure in a medium with this rarefied channels [J]. Fluid Dynamics, 1996, 31(1): 121–126. DOI: 10.1007/BF02230756.
[3]	ETHRIDGE N H, KEEFER J H, CREPEAU J E, et al. Real surface (non-ideal) effects on nuclear explosion airblast from PRISCILLA-type events, part 1: comparison and evaluation of ideal and non-ideal airblast from priscilla computations; and part 2: sharc hydrocode calculations of the priscilla event (phase 1). Final report, 12 March 1992-30 May 1995: AD-A-302079/9/XAB [R]. Aberdeen: Applied Research Associates, Inc. , 1995.
[4]	FRY M A, KAMATH P, BOOK D L. Priscilla calculations and comparison with data: AD-A155 666 [R]. Washington: Naval Research Laborarory, 1985.
[5]	SWIFT L M, SACHS D C, KRIEBEL A R. Air-blast phenomena in the high-pressure region: WT-1403 [R]. Menlo Park, California: Stanford Research Institute, 1960.
[6]	BRYANT E J , ALLEN F. Dynamic pressure impulse for near ideal and non-ideal blast waves: DNA-82-C-0287 [R]. Alexandria, VA: Defense Nuclear Agency, 1983.
[7]	NEEDHAM C E. Blast waves [M]. Berlin, Heidelberg: Springer, 2010.
[8]	ZASLAVSKII B I, MOROZKIN S Y, PROKOF’EV A A, et al. Flow of a planar shock wave around a thermal layer at a rigid wall [J]. Journal of Applied Mechanics and Technical Physics, 1990, 31(3): 354–361. DOI: 10.1007/BF00864563.
[9]	乔登江. 核爆炸物理概论 [M]. 北京: 国防工业出版社, 2003.
[10]	贾雷明, 田宙. 平面冲击波与热层作用数值研究 [J]. 现代应用物理, 2015, 6(4): 305–311. DOI: 10.3969/j.issn.2095-6223.2015.04.013. JIA L M, TIAN Z. Numerical simulation of the interactions between planar shocks and thermal layer [J]. Modern Applied Physics, 2015, 6(4): 305–311. DOI: 10.3969/j.issn.2095-6223.2015.04.013.
[11]	GRIFFITH W C. Interaction of a shock wave with a thermal boundary layer [J]. Journal of the Aeronautical Sciences, 1956, 23(1): 16–22. DOI: 10.2514/8.3495.
[12]	GION E J. Plane shock interacting with thermal layer [J]. Physics of Fluids, 1977, 20(4): 700–702. DOI: 10.1063/1.861928.
[13]	BEN-DOR G. Shock wave reflection phenomena [M]. 2nd ed. Berlin: Springer, 2007. DOI: 10.1007/978-3-540-71382-1.
[14]	王福军. 计算流体动力学分析: CFD软件原理与应用[M]. 北京: 清华大学出版社, 2004.
[15]	NEEDHAM C E, EKLER R G, KENNEDY L W. Extended desert calculation results with comparisons to PRISCILLA experimental data and a near-ideal calculation: ARL-CR-235 [R]. Albuquerque: S-Cubed, 1995.
[16]	EKLER R G, NEEDHAM C E, KENNEDY L W. Extended grassland calculation results with comparisons to PRISCILLA experimental data and a near-ideal calculation: AD-A-298081/1/XAB [R]. Albuquerque: S-Cubed, 1995.