1994 Fiscal Year Final Research Report Summary
ANALYSIS OF AXISYMMETRICAL SHOCK FOCUSING PHENOMENONS BY FLOW VIZUALIZATION,MEASURMENTS OF PRESSURE AND DENSITY AND NUMERICAL CALCULATIONS
| Project/Area Number |
05650184
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | NARA NATIONAL COLLEGE OF TECHNOLOGY |
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Principal Investigator |
KISHIGE Haruaki NARA NATIONAL COLLEGE OF TECHNOLOGY CONTROL ENGINEERING ASSISTANT PROFESSOR, 電子制御工学科, 助教授 (70043487)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Focusing of shock wave / Gasdynamic focus / Molecular vibrational energy relaxation / Pressure amplification |
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| Research Abstract |
Computational and experimental studies of focusing of shock wave reflected from an axisymmetrical parabolic wall were conducted. The shadowgraph fo a focusing shock wave were optically visualized in the shock tube experiments and compared with the computer shadowgraphs which was developed based on the principle of optical shadowgraph. The comparison gives a fairly good agreement. The gasdynamic focus determined by optical shadowgraphs almost agree with the calculated ones.
It is seen from the comparison of the computations and experiments, that the measurement of pressure history at the bottom of the reflector supports the numerical simulation. Furthermore, numerical studies of focusing process with vibrationally excitated case have been performed. The results show that the vibrational relaxation plays an important role for the shok focusing phenomena and the gasdynamic focus defined as the maximum pressure position dose not appear in the case of incident shock Mach numbers lager than 5.
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