Application of rainbow schlieren tomography for shock-containing rectangular jets

Fukunaga, Ryota; Ezoe, Masatoshi; Nakao, Shinichiro; Miyazato, Yoshiaki

doi:10.1007/s12650-022-00827-w

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…The experiments were conducted in a blowdown compressed-air facility in the High-Speed Gasdynamics Laboratory at the University of Kitakyushu. Since the facility has been described in detail elsewhere [8] [9] [10], only a brief description is given in the present paper. Ambient air is pressurized by the compressor up to 1 MPa and stored in a high-pressure reservoir comprising two storage tanks with a total capacity of 2 m 3 after filtering and drying.…”

Section: Experimental Methodsmentioning

confidence: 99%

Study of Rectangular Underexpanded Microjets

Yoshimi¹,

Nakao²,

Miyazato³

2023

OJFD

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The underexpanded microjet emerging from a rectangular convergent nozzle with a high aspect ratio at the nozzle exit is investigated numerically using the Reynolds-averaged Navier-Stokes (RANS) simulation with the Menter's shear stress transport (SST) k-ω turbulence model. The simulation is performed at the nozzle pressure ratio of 5.0 to produce a strong shock and it is validated by a comparison with a rainbow schlieren picture of the microjet. The three-dimensional structure of the shock-containing rectangular microjet is demonstrated using the isopycnic surface and bright-field schlieren representations.

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Section: Experimental Methodsmentioning

confidence: 99%

Study of Rectangular Underexpanded Microjets

Yoshimi¹,

Nakao²,

Miyazato³

2023

OJFD

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“…For example, Guo Y. L. et al [20] failed to fully reflect the distribution law in the process of shock wave propagation and the limitations of the existing empirical formula for calculating the peak pressure of shock wave. They adopted networked testing technology to acquire signals of shock wave pressure changes over time, based on computer tomography imaging technology [21,22], utilized the generalized inverse inversion algorithm to obtain inverse calculation results, and combined weighted techniques for fine adjustment and optimization, in order to accurately invert the propagation speed of the explosive shock wave. According to the relationship between peak overpressure and velocity, the distribution of shock wave pressure field can be calculated.…”

Section: Application Of Travel Time Tomography In Reconstruction Of S...mentioning

confidence: 99%

Review of shock wave pressure reconstruction methods in explosion field

Wang,

Kong,

Shang

2023

J. vibroeng.

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Explosion shock wave pressure is one of the main damage parameters produced in the process of ammunition explosion, and it is also an important technical index to evaluate the damage power of ammunition. However, in the actual testing process, only a limited amount of shockwave pressure data at specific measuring points can be obtained, which cannot accurately reflect the distribution laws of the shockwave pressure propagation after the ammunition explosion. Therefore, it is particularly important to conduct reconstruction of the shockwave pressure field distribution laws based on limited measuring point data. This paper reviews the research work and related achievements obtained by researchers at home and abroad on the reconstruction of shockwave pressure distribution laws in explosion fields. The paper also elucidates the relevant application of computer tomography imaging techniques, shockwave propagation attenuation model reconstruction, and various interpolation algorithms in the reconstruction process of the shockwave pressure field. Given the current research situation both domestically and internationally, we have pinpointed the major issues that still exist in the current stage of research and proposed the key areas of focus that need attention in future research.

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