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Mach reflection of gaseous detonations.
~
Akbar, Raza.
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Mach reflection of gaseous detonations.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
Mach reflection of gaseous detonations./
作者:
Akbar, Raza.
面頁冊數:
113 p.
附註:
Adviser: Joseph E. Shepherd.
Contained By:
Dissertation Abstracts International59-02B.
標題:
Engineering, Aerospace. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9823651
ISBN:
0591757265
Mach reflection of gaseous detonations.
Akbar, Raza.
Mach reflection of gaseous detonations.
- 113 p.
Adviser: Joseph E. Shepherd.
Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 1997.
The phenomenon of Mach reflection in gaseous detonations was investigated experimentally and numerically using laser shadowgraphy and calculations based on extensions of theories of shock wave reflection. Three different reactive mixtures were used in the experiments: mix 1 was stoichiometric hydrogen and oxygen at 295 K and 20 kPa, mix 2 was a stoichiometric hydrogen and oxygen with 77.5% argon dilution, at 295 K and 20 kPa. Mix 3 consisted of stoichiometric acetylene and oxygen with 80% argon dilution, at 50 kPa and 295 K. Detonations in each mixture were imaged interacting with wedges, with the wedge angle, $\theta$, ranging from 15 degrees to 50 degrees. Triple point trajectory angles, $\chi$, were inferred from the shadowgraphs. $\chi$ was also obtained from soot foil records for wedge angles of 20, 25 and 30 degrees. Relationships between $\chi$ and $\theta$ were calculated, using 3-shock theory and Whitham's shock dynamics theory, both with and without energy release. Contours of the leading waves were obtained from the shadowgraphs to investigate the self-similarity assumption. It was found that the Mach reflections mostly exhibited self-similar behavior, with the exception of $\theta$ of 30$\sp\circ$ for mix 1, where the Mach reflection seems to be changing shape, within the field of observation. The calculated $\chi-\theta$ relations did not agree with those from the experiments, except in the case of mix 2, where, the relation calculated assuming frozen chemistry was in good agreement with the experiments. These results are discussed with regard to, the presence of an intrinsic length scale in gaseous detonations and the behavior of the transverse waves.
ISBN: 0591757265Subjects--Topical Terms:
1018395
Engineering, Aerospace.
Mach reflection of gaseous detonations.
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The phenomenon of Mach reflection in gaseous detonations was investigated experimentally and numerically using laser shadowgraphy and calculations based on extensions of theories of shock wave reflection. Three different reactive mixtures were used in the experiments: mix 1 was stoichiometric hydrogen and oxygen at 295 K and 20 kPa, mix 2 was a stoichiometric hydrogen and oxygen with 77.5% argon dilution, at 295 K and 20 kPa. Mix 3 consisted of stoichiometric acetylene and oxygen with 80% argon dilution, at 50 kPa and 295 K. Detonations in each mixture were imaged interacting with wedges, with the wedge angle, $\theta$, ranging from 15 degrees to 50 degrees. Triple point trajectory angles, $\chi$, were inferred from the shadowgraphs. $\chi$ was also obtained from soot foil records for wedge angles of 20, 25 and 30 degrees. Relationships between $\chi$ and $\theta$ were calculated, using 3-shock theory and Whitham's shock dynamics theory, both with and without energy release. Contours of the leading waves were obtained from the shadowgraphs to investigate the self-similarity assumption. It was found that the Mach reflections mostly exhibited self-similar behavior, with the exception of $\theta$ of 30$\sp\circ$ for mix 1, where the Mach reflection seems to be changing shape, within the field of observation. The calculated $\chi-\theta$ relations did not agree with those from the experiments, except in the case of mix 2, where, the relation calculated assuming frozen chemistry was in good agreement with the experiments. These results are discussed with regard to, the presence of an intrinsic length scale in gaseous detonations and the behavior of the transverse waves.
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