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  1. B200 工学部/工学研究科
  2. B200b 紀要
  3. Memoirs of the Faculty of Engineering, Nagoya University
  4. 39(1)

A strong shock wave supported by the absorption of laser

https://doi.org/10.18999/memfenu.39.1.163
https://doi.org/10.18999/memfenu.39.1.163
aa8b1264-e6b1-41a8-b9fd-8b22c305a710
名前 / ファイル ライセンス アクション
39-1-06.pdf 39-1-06.pdf (1.1 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2020-10-29
タイトル
タイトル A strong shock wave supported by the absorption of laser
言語 en
著者 Fujiwara, Toshi

× Fujiwara, Toshi

WEKO 102039

en Fujiwara, Toshi

Search repository
Nishiwaki, Takashi

× Nishiwaki, Takashi

WEKO 102040

en Nishiwaki, Takashi

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
抄録
内容記述 Basically laser propulsion can be achieved either by LSC (Laser Supported Combustion Wave) or by LSD (Laser Supported Detonation Wave) as a mechanism for a propellant gas to absorb laser radiation. Although LSC has been studied by Keefer, Kemp and others [2, 3, 5,] since laser propulsion was proposed in the beginning of 1970's, virtually no analyses on LSD have been attempted since Raizer [1] gave a full description of laser nuclear fusion where he presented several attempts to analyze and found out possible mechanisms on laser absorption by strongly heated gas. In the present analysis the structure of a LSD is shown by solving one-dimensional gasdynamic equations taking account of inverse bremsstrahlung absorption of laser energy incident on the front shock wave. The structure of the detonation consists of (i) a shock wave heating the low-temperature non-absorbing propellant gas up to a very high temperature enabling it to absorb laser radiation, (ii) followed by a thick absorption region where the subsonic flow is accelerated by exothermicity to the sonic velocity. Virtually all the laser energy is utilized to raize the temperature of this region until an equilibrium state is established between the radiation at incident laser wavelength and the bremsstrahlung radiation emission from the heated gas. The Chapman-Jouguet condition is imposed to determine the propagation velocity of the detonation as an eigen value for a given laser intensity; radiation equilibrium is achieved at the sonic state. In practice, the calculation is performed in a manner that an eigen-value laser intensity is searched for a given detonation velocity to satisfy the C-J condition. Out of four conservation equations, the energy and radiative transfer relations contain radiation terms in differential forms which are integrated using the RK method. The results show that the thickness of a detonation wave is several mm through several microns and the propagation velocity D[S] satisfies a relation given by Raizer (Ref. 1) ; D[S]= [2(γ[2]-1)I[0]/[ρ][0]][1/3], which gives the propagation velocity of the order of 50 km/sec for the laser intensity I[0][≅]10[8] w/cm[2]. A multi-dimensional laser detonation using the spherical coordinate is partly analyzed as well.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 Faculty of Engineering, Nagoya University
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
ID登録
ID登録 10.18999/memfenu.39.1.163
ID登録タイプ JaLC
ISSN(print)
収録物識別子タイプ PISSN
収録物識別子 0027-7657
書誌情報 en : Memoirs of the Faculty of Engineering, Nagoya University

巻 39, 号 1, p. 163-179, 発行日 1987-10-31
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