著者
山名 正夫
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空学会誌 (ISSN:00214663)
巻号頁・発行日
vol.14, no.149, pp.170-176, 1966

The phenomenon of "Hitodama", a fairly popular term from ancient in Japan and probably corresponding to will-o'-the-wisp, is studied from the viewpoint of combustion of gases. The viewpoint has come out of the examination on nearly 100 actual examples mostly observed by the acquaintances of the author. An experimental simulation is tried in a wind-tunnel, in which the setup is so devised that the mixing of methane and surrounding air is caused merely by interdiffusion. A long, horizontal column of methaneair mixture thus formed is ignited to establish a propagating flame. The observed flames take three representative types; long one with a ringshaped head, one with a conically-grooved head, and spherical one with a short tail, according to the concentration profile in the column. The analytical investigation gives calculated shapes of methane flames which are in a fairly good agreement with observed ones.
著者
池田 健
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空学会誌 (ISSN:00214663)
巻号頁・発行日
vol.4, no.32, pp.231-237, 1956-09-28 (Released:2009-05-25)
参考文献数
8
著者
鷲津 久一郎
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空学会誌 (ISSN:00214663)
巻号頁・発行日
vol.5, no.43, pp.215-218, 1957 (Released:2009-07-09)
参考文献数
5

Equations of motion for a rigid aircraft propelled by solid propellant of cigarette burning type are derived, having effects of varying mass and varying position of centre of gravity into account. In the present method, an aircraft coordinate is fixed at a rigid part of the aircraft. Therefore, the magnitudes of aerodynamic forces and moments with respect to the axes of the aircraft coordinate depend on motions of the aircraft only and do not depend on the instantaneous position of the centre of gravity of the aircraft.