http://swrc.ontoware.org/ontology#TechnicalReport
Characteristics method applied to a line source explosion
en
one dimensional flow
gas explosion
gas dissociation
shock wave propagation
line source explosion
velocity distribution
pressure distribution
similarity solution
dimensional analysis
unsteady flow
東野 文雄
坂口 堯
林 光一
小川 哲
Higashino Fumio
Sakaguchi Gyo
Hayashi A. Koichi
Ogawa Satoru
宇宙航空研究開発機構
Japan Aerospace Exploration Agency (JAXA)
JAXA Research and Development Memorandum
JAXA-RM-07-017E
2008-03-31
Cylindrical blast waves generated in a real air is investigated by means of the method of characteristics under the assumption of a line source explosion. The effect of dissociation on shock wave propagation in air is evaluated by utilizing an effective isentropic index. The effect of dissociation is remarkable in the velocity profiles behind shock front for initial shock strengths between M(sub 0) = 4 and 8. Various mesh sizes on numerical computation are tested to determine the trajectory of the shock front in the time-space domain. In the case of perfect gases without dissociation, the 51 points on a constant time line are enough to integrate the characteristic equations. For dissociating gases, the 201 points are necessary to continue stable computations. Pressure profiles at a long time elapse after explosion reveal that the pressure in the vicinity of the explosion center gradually decreases below the initial pressure of the atmosphere different from similarity solutions.
1349-1121
AA11983593
資料番号: AA0063999000
レポート番号: JAXA-RM-07-017E