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Mach reflection of gaseous detonations.

Akbar, Raza.

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Mach reflection of gaseous detonations.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Mach reflection of gaseous detonations./
Author:	Akbar, Raza.
Description:	113 p.
Notes:	Adviser: Joseph E. Shepherd.
Contained By:	Dissertation Abstracts International59-02B.
Subject:	Engineering, Aerospace. -
Online resource:	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.
LDR:02570nam 2200289 a 45 001 932625
005 20110505
008 110505s1997 eng d
020 $a 0591757265
035 $a (UnM)AAI9823651
035 $a AAI9823651
040 $a UnM $c UnM
100 1 $a Akbar, Raza. $3 1256365
245 1 0 $a Mach reflection of gaseous detonations.
300 $a 113 p.
500 $a Adviser: Joseph E. Shepherd.
500 $a Source: Dissertation Abstracts International, Volume: 59-02, Section: B, page: 0739.
502 $a Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 1997.
520 $a 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.
590 $a School code: 0185.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Fluid and Plasma. $3 1018402
690 $a 0538
690 $a 0548
690 $a 0759
710 2 0 $a Rensselaer Polytechnic Institute. $3 1019062
773 0 $t Dissertation Abstracts International $g 59-02B.
790 $a 0185
790 1 0 $a Shepherd, Joseph E., $e advisor
791 $a Ph.D.
792 $a 1997
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9823651