文献一覧: 一般社団法人日本機械学会 (出版者)

The flow induced noise from an expansion cavity-type muffler increases abruptly for some sizes of mufflers and flow velocities. This phenomenon is strongly related to the resonance of the tail pipe and the cavity of the muffler ; therefore, it is called the predominance of resonance゛When the cavity length is increased, the measured resonance frequency shows periodic jumps. The cause of the predominance of resonance is assumed to be the generation of vortex rings with a particular frequency in the cavity. The generation of vortex rings is verified by analyzing fluctuating velocities in the cavity when the predominance of resonance occurs. The phenomenon is induced not only by the tail pipe resonance, but also by the cavity resonance. It is suggested that there exists the feedback phenomenon from the sound to the flow and it is strongly related to the sound pressure level in the cavity.

2020-08-26 13:29:59
1 + 1 Wikipedia

https://ci.nii.ac.jp/naid/110002403160

1 0 0 0 燃料液滴の干渉燃焼に及ぼす重力の影響

著者: 三上真人加藤秀輝佐藤順一河野通方
出版者: 一般社団法人日本機械学会
雑誌: 日本機械学会論文集. B編 (ISSN:03875016)
巻号頁・発行日: vol.61, no.582, pp.731-737, 1995-02-25
参考文献数: 16
被引用文献数: 1

The effect of gravity on fuel droplets burning interactively has been studied experimentally. Experiments on two droplets aligned horizontally were conducted both in normal gravity and in microgravity. Results show that in normal gravity, oxygen starvation between the flames is not as severe as in microgravity. Natural convection, which supplies oxygen to the flame, is stronger at a smaller initial separation distance when two flames exist separately. The instantaneous burning rate for the same normalized droplet diameter has a maximum in normal gravity when the initial separation distance is changed and decreases monotonically in microgravity with decreasing initial separation distance, except for the initial period of burning. Thus, the effect of gravity, which decreases the burning lifetime, is greatest at a certain initial separation distance.

2020-08-26 13:29:59
1 + 1 Wikipedia

https://ci.nii.ac.jp/naid/110002394238

1 0 0 0 3510 1万kWe超小型高速炉(4S炉)の受動安全特性(S49-1 安全,材料,原子炉用機器,S49 原子炉システムおよびその要素技術)

著者: 松宮壽人坂下嘉章坪井靖松本弘植田伸幸
出版者: 一般社団法人日本機械学会
雑誌: 年次大会講演論文集 : JSME annual meeting
巻号頁・発行日: vol.2005, no.3, pp.179-180, 2005-09-18

A conceptual design of sodium cooled fast reactor as small-decentralized power supply has been performed. The reactor named 4S (Super Safe, Small and Simple) has a reflector controlled U-Zr metallic fuel core. Characteristics of the 4S reactor are non-refueling (core life time: 30 years), the negative coolant void reactivity during 30 years, integrated and simple reactor structure, and natural circulation decay heat removal systems. Accidents without scram events (AWS) as unprotected sudden loss of flow event and ATWS events have been analyzed for the passive safety features of 4S using a transient simulation code (ARGO-3 code). It is predicts that the passive safety can evade sever damages of the core and primary coolant boundary under the ATWS and AWS events.