Technical Report Hydroxylammonium nitrate系一液推進剤のレーザー点火に関する研究
Laser ignition of hydroxylammonium nitrate based monopropellant

勝身, 俊之  ,  Katsumi, Toshiyuki

現在,宇宙機の姿勢制御に用いられる1液スラスタでは,推進剤としてヒドラジンが使用されているが,高い毒性を有することから,近年,低毒性推進剤が注目を集めている。日本国内では,入手性が高いことから,主にHydroxylammonium nitrate(HAN)系低毒性1液推進剤の実用化に向けた研究開発が進められている。また,従来のヒドラジン一液スラスタでは,触媒によって化学反応を誘起し,生成したガスを噴射し推力を得ているが,HAN系低毒性1液推進剤の断熱火炎温度が高いことによる触媒の劣化が課題となっている。そこで,高温酸化雰囲気において劣化や損耗のほとんどないレーザー点火に着目した。本研究では,HAN系低毒性1液推進剤のレーザー点火の実現可能性を評価することを目的とし,HAN系低毒性1液推進剤液滴のレーザー点火実験を行った。
In most researches on a green monopropellant thruster, a catalyst is employed in order to initiate the chemical reaction in the monopropellant thruster as is the case with a conventional hydrazine thruster. In the case of Hydroxylammonium nitrate (HAN) based monopropellant, SHP163, the catalyst is easy to be degraded and/or broken because its flame temperature is too high for the catalyst. In order to extend the lifetime of the thruster, we evaluated experimentally a laser ignition method for HAN based monopropellant. As one of feasibility studies, ignition tests of a propellant droplet were carried out in a closed chamber. We measured inside pressure of the chamber and obtained shadowgraph movie by using high speed video camera at several different laser energies. As the result, it was found that HAN-based monopropellant gasified at more than approximately 20mJ of laser energy. And, the behavior of a droplet was observed successfully by high speed shadowgraph when a laser was irradiated.
形態: 図版あり
Physical characteristics: Original contains illustrations

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