- 著者
- Hiroshi SASAKI Naohisa TESHIROGI
- 出版者
- The Japan Society of Mechanical Engineers
- 雑誌
- JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties (ISSN:09148817)
- 巻号頁・発行日
- vol.33, no.3, pp.599-605, 1990-08-15 (Released:2008-02-18)
- 参考文献数
- 9
This paper gives the experimental results obtained with a two-stroke cycle single-cylinder research engine using an electrically heated combustion chamber to simulate the combustion chamber of a low-heat-rejection(LHR) DI diesel engine with the M-combustion system. In this report, the experiment was performed to investigate the influences of combustion chamber surface temperature and swirl ratio on the combustion of a LHR DI diesel engine with the M-conbustion system. It is found that the combustion of fuel deposited on the surface is greatly affected by the combustion chamber surface temperature, and the diesel combustion is controlled by the swirl and the surface temperature of the combustion chamber.
- 著者
- FUJII Terushige OHTA Jun-ichi AKAGAWA Koji NAKAMURA Toshi ASANO Hitoshi
- 出版者
- 日本機械学会
- 雑誌
- The Japan Society of Mechanical Engineers, Series II (ISSN:09148817)
- 巻号頁・発行日
- vol.35, no.2, pp.319-324, 1992-02
From the viewpoint of energy conservation and the development of new energy resources,it is important to utilize geothermal resources and waste heat from factories. Among energy conversion device,there is a radial outflow reaction turbine,i.e.,Hero's turbine. Performance characteristics of Hero's turbine are analytically and experimentally clarified for flashing expansion of initially subcooled hot water. It is found that: (a)there is an optimum number of revolutions at which maximum tubine efficiency can be obtained; (b)Hero's turbine internal efficiency can be expressed as an algebraic equation and (c)nozzle loss accounts for almost 90% of the total turbine loss.
- 著者
- MYONG Hyon Kook KASAGI Nobuhide
- 出版者
- 一般社団法人日本機械学会
- 雑誌
- JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties (ISSN:09148817)
- 巻号頁・発行日
- vol.33, no.1, pp.63-72, 1990-02-15
- 被引用文献数
- 8
An improved near-wall k-ε turbulence model is proposed considering the two characteristic length scales for the dissipation rate, one very near the wall and the other remote from the wall, which are then related to the length scale for turbulent momentum transfer. Consequently, the function f_μ included in the eddy diffusivity model represents two distinct physical effects of low turbulent Reynolds number and wall proximity. The present k-ε model is evaluated for its application to fully developed turbulent pipe and channel flows and found to resolve two serious weaknesses common to previous k-ε models; i.e., it correctly predicts the wall-limiting behavior of the major turbulence quantities such as Reynolds stress, turbulent kinetic energy and its dissipation rate near the wall, and the distributions of eddy diffusivity of momentum and turbulent kinetic energy even in the region far from the wall.