著者

浜口 和洋 高橋 真太郎 宮部 英也

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.48, no.435, pp.p2207-2216, 1982-11

被引用文献数

3

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スターリング機関再生器のマトリックス材としてメッシュ数の大きい金額を多数枚積層したものが使用されているが, その流動損失に関する研究は少ない. 本研究では, 10から300メッシュまでの広い範囲の金網を積層したマトリックスの定常流および非定常流における流動損失を調べた. おのおのの場合において, 金網の幾何学的形状を知ることにより, 任意の金網の摩擦係数をレイノルズ数の関数として与える実験式が得られた.

著者

岩本 順二郎

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.52, no.482, pp.p3422-3427, 1986-10

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The results of experiments on the thermal effect for tubes of different tapers are presented, and the effects of the tapering of the tube on the internal flow are shown. The results are summarized as follows: (1) With a tapered tube a higher temperature is obtained with smaller intervals of nozzle-tube spacings compared with the cylindrical tube. (2) With a tapered tube a higher frequency of flow oscillations and a shorter penetration length of contact surfaces which are considered to cause a higher temperature in the tube, together with stronger shock, are obtained (3) The velocity history at the open end is different for tubes with different tapers. When the taper is small, the amplitude of the velocity change becomes very small. (4) The pressure amplitude at the closed end becomes large for tubes with large tapers.

著者

林 農 加藤 優 田川 公太朗 原 豊

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.74, no.740, pp.841-849, 2008-04-25 (Released:2011-08-16)

参考文献数

11

被引用文献数

1

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In recent years, the wind turbines have been installed actively and the suitable sites of wind farm have been decreased on land. On the other hand, a lot of wind energy resources are latent and it is expected that wind power will be installed in the future on the sea. This study aims to establish a measurement method of wind characteristics using a small ship for decision of suitable site for offshore wind power. We constructed the wind measurement system, which is composed of an ultrasonic anemometer, a differential GPS (DGPS) and an inertial measurement unit. The system was installed to a small ship and wind characteristics at 10 m height above the sea surface were measured by an ultrasonic anemometer on the Sea of Japan close to Tottori prefecture. Raw data of the wind velocity obtained in the proposed method includes the error caused by the pitching, rolling and yawing of the ship. In this study, the raw data of wind velocity was corrected by the data of the DGPS and the inertial measurement unit. Conclusively, the raw wind velocity contaminated by the oscillation and cruising of the ship was corrected and the wind velocity maps were obtained.

著者

金山 公夫 馬場 弘 山本 政樹

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.54, no.499, pp.p728-733, 1988-03

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The renewable energy laboratory of Kitami Institute of Technology is a facility for the research of space heating, cooling and hot water supply using solar energy and underground water heat by means of a solar system and a heat pump system. Measurements for two types of combination of series-and parallel-solar heat pump systems has been carried out during the last five years. In this study, based on the measured data of the solar heat pump systems, a simulation program is produced to estimate the thermal performance of the systems, and the results calcuated by a personal computer are compared with the experimental results. The correlation between two dimensionless factors of X_H(=COP_<HP>Q_<EMAX>/Q_<TL>) and Y_H(=F_W/F_<WMAX>) can be obtained in order to calculate easily the performance of a stand along heat pump system.

著者

益田 重明 児山 秀晴 有賀 一郎

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.49, no.437, pp.p81-90, 1983-01

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固定軸のまわりに一定角速度で回転する乱流せん断流を,レイノルズ平均法を用いて予測する際に必要な乱流モデルについて検討した.モデル定数が回転に依存しないことを主眼として,レイノルズ応力方程式の高レイノルズ数モデルを導き,回転流路内の二次元乱流境界層における実結果と比較した.その結果,回転場での経験則を全く用いずに,平均場および乱流場に対する回転の効果を正しく予測することができることが示された.

著者

川上 幸作

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.53, no.488, pp.p1131-1135, 1987-04

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In the previous paper, the pressure Loss coefficient of branching rapidly increased when the flow ratio in a cross pipe was in a certain zone. In this experiment, the author observed the flow condition in a cross pipe by using a hydrogen bubble method. As a result of this experiment, it is made clear that the condition of the pressure loss is closely related to the formative mechanism of a vortex and setting a straightening vane in a grade crossing section of a cross pipe restrains the rapid increase of the pressure loss. This paper reports about these phenomena.