1 0 0 0 OA 高応答遮熱壁面が急速圧縮膨張場の壁面熱伝達に及ぼす影響
- 著者
- 原田 雄司 田中 達也 中尾 裕典 服平 次男 青木 理 山下 洋幸
- 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 (ISSN:21879761)
- 巻号頁・発行日
- vol.84, no.858, pp.17-00458-17-00458, 2018 (Released:2018-02-25)
- 参考文献数
- 30
Heat insulation by a wall material which has low heat capacity and heat conductivity is one of the effective ways to reduce heat transfer. By the heat insulated coating, wall temperature is fluctuated following the behavior of in-cylinder gas temperature, which decreases the gap between gas and wall temperature. In order to suppress wall heat transfer in wide engine operation range, Model Based Development is required. In this study, wall heat transfer mechanism under wall temperature fluctuated condition by heat insulation was investigated by simultaneous measurement of wall heat flux and flow behavior in wall boundary layer in RCEM. As a result, it was clarified that turbulent energy was influenced by wall temperature behavior, which impact on heat transfer coefficient. In addition, non-dimensional velocity distribution in wall boundary layer was not changed drastically by wall temperature behavior. In terms of modeling under heat insulated condition, wall heat flux was able to be predicted well by wall heat transfer model taking into account of density change in wall boundary layer.
- 著者
- 花田 英夫 岩田 隆浩 菊池 冬彦 劉 慶会 松本 晃治 浅利 一善 石川 利昭 石原 吉明 野田 寛大 鶴田 誠逸 Petrova Natalia Goossens Sander 原田 雄司 佐々木 晶 並木 則行 河野 裕介 岩館 健三郎 亀谷 收 寺家 孝明 柴田 克典 田村 良明 矢作 行弘 増井 亘 田中 孝治 前島 弘則 洪 暁瑜 平 勁松 艾力 玉〓甫 Ellingsen Simon Schlüter Wolfgang
- 出版者
- The Geodetic Society of Japan
- 雑誌
- 測地学会誌 (ISSN:00380830)
- 巻号頁・発行日
- vol.55, no.2, pp.203-221, 2009-07-25
- 被引用文献数
- 5
The Japanese lunar explorer SELENE (KAGUYA), which has been launched on Sep. 14th, 2007, utilizes VLBI observations in lunar gravimetry investigations. This can particularly improve the accuracy of the low degree gravitational harmonics. Combination of ground based VLBI observations and Doppler measurements of the spacecrafts enable three dimensional orbit determinations and it can improve the knowledge of the gravity field near the limb. Differential VLBI Radio sources called VRAD experiment involves two on-board sub-satellites, Rstar (Okina) and Vstar (Ouna). These will be observed using differential VLBI to measure the trajectories of the satellites with the Japanese network named VERA (VLBI Exploration of Radio Astrometry) and an international VLBI network.<BR>Two new techniques, a multi-frequency VLBI method and the same-beam VLBI method, are used to precisely measure the angular distance between the two sub-satellite radio sources Okina and Ouna. The observations are at three frequencies in S-band, 2212, 2218 and 2287 MHz, and one in X-band, 8456 MHz. We have succeeded in making VLBI observations of Okina/Ouna with VERA and the international network, and have also succeeded in correlating of signals from Okina/Ouna, and obtained phase delays with an accuracy of several pico-seconds in S-band.