A theoretical method for the calculation of flow field behind blast reflected waves

JIA Leiming; WANG Shufei; TIAN Zhou

doi:10.11883/bzycj-2018-0167

Volume 39 Issue 6

Jun. 2019

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Article Navigation > Explosion And Shock Waves > 2019 > 39(6): 064201

JIA Leiming, WANG Shufei, TIAN Zhou. A theoretical method for the calculation of flow field behind blast reflected waves[J]. Explosion And Shock Waves, 2019, 39(6): 064201. doi: 10.11883/bzycj-2018-0167

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JIA Leiming, WANG Shufei, TIAN Zhou. A theoretical method for the calculation of flow field behind blast reflected waves[J]. Explosion And Shock Waves, 2019, 39(6): 064201. doi: 10.11883/bzycj-2018-0167

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A theoretical method for the calculation of flow field behind blast reflected waves

doi: 10.11883/bzycj-2018-0167

JIA Leiming^{1, 2
,},
WANG Shufei^{1, 2},
TIAN Zhou²

1.
Department of Engineering Physics, Tsinghua University, Beijing 100084, China
2.
Northwest Institute of Nuclear Technology, Xi’an 710024, Shaanxi, China

Received Date: 2018-05-06
Rev Recd Date: 2018-07-19

Available Online: 2019-07-25

Publish Date: 2019-06-01

Abstract

Abstract

Upon impinging on a rigid surface, the blast wave would go through regular and irregular reflection successively. A theoretical model is developed for the determination of the flow field behind the reflected wave, which is based on the method of image and identifies the field around blast wave reflection with that resulting from the interaction of real and imaginary bursts. Firstly, approximations of both reflected wave and Mach stems to circular arcs, centered on the imaginary burst point and ground zero respectively, are made. Then, given the blast free field, the method based on geometrical similarity is applied to calculate the temporal evolution of shock wave structures and differentiate different flow zones. Lastly, a newly developed addition model LAMBR (LAMB revisied) is employed to obtain the field parameters behind the reflected wave. The field parameter contours and peak values are in good agreement with the numerical results and the data from UFC 3-340-02, so the theoretical model is valid. And, the time needed for the theoretical calculation is much shorter than that for numerical simulation.
- blast wave,
- irregular reflection,
- method of image,
- theoretical calculation

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References(22)

References

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