巻号一覧
64 巻, 627 号
選択された号の論文の55件中51～55を表示しています
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平田 東彦, 堀 美知郎1998 年 64 巻 627 号 p. 3894-3901
発行日: 1998/11/25
公開日: 2008/03/28
ジャーナル フリーA molten carbonate fuel cell (MCFC) stack using internal manifold and co-flow configuration has been recognized as a key structure for commercial plants. In a conventional stack, it is more difficult to obtain a uniform gas flow in the stacking direction than in a stack using an external manifold configuration. The uniformity of gas flow rate in each stacked cell affects the cell performance, and careful design of the gas flow rate distribution in the stacking direction is required. In this study, the stacking direction gas flow characteristics in a plate heat exchanger type MCFC stack were examined by numerical analysis. A stack consisting of 100 cells was assumed, and the fuel gas flow was calculated under various manifold section sizes, gas utilizations, and pressure conditions. The junction pressure losses and electrochemical reactions, which mainly affect the stacking direction gas flow, were considered. Considering the effect on the cell performance, a design guideline for the flow uniformity in the stacking direction was discussed.抄録全体を表示PDF形式でダウンロード (901K) -
君島 真仁, 河合 素直, 植草 常雄, 大島 一夫1998 年 64 巻 627 号 p. 3902-3908
発行日: 1998/11/25
公開日: 2008/03/28
ジャーナル フリーWaste heat recovery of the fuel cell stack cooling system is very important from the viewpoint of effective use of energy. Simultaneously, temperature control of the fuel cell stack is necessary to maintain high electrical efficiency and to prevent the cell stack from oxidation. In phosphoric acid fuel cell system, coolant temperature is controlled to keep constant the temperature of cell stack. The purpose of this paper is to propose the simple dynamic model for designing the temperature control system and heat recovery system of fuel cell stack cooling system. In addtion to this, experimental research and simulation analysis reveal the dynamic characteristics of fuel cell stack cooling system with control equipments. Throughout the researches, concentrated parameter dynamic model is proposed and the validity of the model is confirmed by experimental results. When the transient response to disturbances such as make-up water pump start up is calculated, it is clarified that the coolant temperature of fuel cell stack can be controlled.抄録全体を表示PDF形式でダウンロード (773K) -
陳 之立, 金野 満, 梶谷 修一1998 年 64 巻 627 号 p. 3909-3914
発行日: 1998/11/25
公開日: 2008/03/28
ジャーナル フリーEngine performance and exhaust gas characteristics of a direct injection CI engine were investigated with neat dimethyl-ether (DME), an alternative fuel being considered for attaining low emissions. The study was conducted by comparing with conventional gas oil. Results from the present work include : (1) It was necessary to add a small amount of lubricating additives to DME for achieving satisfactory engine operation, to minimize some excessive wear in the injection nozzle. (2) Engine performance for both fuels were comparable. (3) Although negligible amounts of soot ane very low THC emissions were measured, NOx emission was about the same as in gas-oil operation. (4) The reduction of NOx emission by retarding the injection timing was highly significant with DME. (5) The NOx emission from the retrofited engine could be further reduced by dissolving CO2 in DME.抄録全体を表示PDF形式でダウンロード (778K) -
河村 清美, 鈴置 哲典, 斎藤 昭則, 友田 晃利, 神田 睦美1998 年 64 巻 627 号 p. 3915-3920
発行日: 1998/11/25
公開日: 2008/03/28
ジャーナル フリーAn instrument to measure time-resolved fuel-air ratios in the vicinity of a spark plug was developed. Absorption and scattering at the wavelengths of visible and infrared rays were utilized to determine the fuel-air ratios in the mixture including liquid and vaporized fuel. The measurement error of the instrument was estimated within 10% from comparison between the overall and the measured fuel-air ratios at the vicinity of the spark plug with inlet port injection which froms homogeneous mixture. The instrument was applied to direct injection gasoline engines and the mixture formation process was discussed.抄録全体を表示PDF形式でダウンロード (695K) -
吉川 康雄, 國見 均, 貴志 泰久, 香月 伸一, 石澤 静雄1998 年 64 巻 627 号 p. 3921-3928
発行日: 1998/11/25
公開日: 2008/03/28
ジャーナル フリーA simulation model for predicting air quality along urban main roads is being studied. The previous reports dealt with the development of atmospheric diffusion model and a photochemical reaction model as well as traffic flow model. The present report describes the incorporation of the atmospheric diffusion model and the traffic flow model, which enables simulation of the effect of traffic parameters on air quality along the main roads. Emission mass from each vehicle is calculated by the traffic flow model using instanteneous velocity and accelaration of the vechiles. Then, the emission data is converted into increase of concentration, and passed into the atmospheric diffusion model for its source term. A case study was conducted using the incorporated model, in which some traffic parameters were studied to show their infulence on traffic flow and air qulity around the road.抄録全体を表示PDF形式でダウンロード (733K)