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A Study of the Impulse Wave Discharged from the Exits of Two Parallel tube.

Journal of Thermal Science 2003年第4期12卷 332-336,356页

作者： Yong-Hun Kweon Heuy-Dong Kim Toshiaki Setoguchi Toshiyuki Aoki School of Mechanical Engineering Andong National University Andong 760-749 KoreaSchool of Mechanical Engineering Andong National University Andong 760-749 KoreaDepartment of Mechanical Engineering Saga University Honjo Saga 840-8502 JapanDepartment of Energy Science and Engineering Kyushu University Kasuga Fukuoka 816-8580 Japan

The twin impulse wave leads to very complicated flow fields, such as Mach stem, spherical waves, and vortex ring. The twin impulse wave discharged from the exits of the two tube. placed in parallel is investigated to understand the detailed flow physics associated with the twin impulse wave, compared with those in a single impulse wave. In the current study, the merging phenomena and propagation characteristics of the impulse waves are investigated using a shock tube.experiment and by numerical computations. The Harten-Yee''s total variation diminishing (TVD) scheme is used to solve the unsteady two-dimensional compressible Euler equations. The Mach number Ms of incident shock wave is changed below 1.5 and the distance between two-parallel tube., L/d, is changed from 1.2 to 4.0. In the shock tube.experiment, the twin impulse waves are visualized by a Schlieren optical system for the purpose of validation of computational work. The results obtained show that on the symmetric axis between two-parallel tube., the peak pressure produced by the twin impulse waves and its location strongly depend upon the distance between two-parallel tube., L/d and the incident shock Mach number, Ms. The predicted Schlieren images represent the measured twin-impulse wave with a good accuracy.

关键词： compressible flow unsteady flow impulse wave shock wave shock tube.

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