Direct heat loss to combustion chamber walls in a direct-injection diesel engine: Evaluation of direct heat loss to piston and cylinder head

被引：11

作者：

Suzuki, Y. ^{[1
]}

Shimano, K. ^{[2
]}

Enomoto, Y. ^{[2
,5
]}

Emi, M. ^{[3
]}

Yamada, Y. ^{[4
]}

机构：

[1] Research and Development Office, Mitsubishi Fuso Truck and Bus Corporation, Tochigi

[2] Department of Mechanical Systems Engineering, Musashi Institute of Technology, Tokyo

[3] Nissan Motor Corporation, Kanagawa

[4] NGK Spark Plugs Corporation, Aichi

[5] Mechanical Systems Engineering Department, Musashi Institute of Technology, Setagaya-ku, Tokyo 158-8557

来源：

International Journal of Engine Research | 2005年 / 6卷 / 02期

关键词：

Diesel engine; Instantaneous heat flux; Instantaneous surface temperature; Thermal efficiency; Thin-film thermocouple;

D O I：

10.1243/146808705X7428

中图分类号：

学科分类号：

摘要：

The purpose of this study is to clarify the state of the heat loss in a direct-injection diesel engine. Originally developed thin-film thermocouples (TFTs) are embedded into the combustion chamber walls for accurate measurement of instantaneous surface temperature from which instantaneous heat flux is evaluated through the heat conduction equation. Measured points are arrayed on the cavity bottom, the cavity side wall, the piston top, and the cylinder head. The TFTs are designed and fabricated so that disturbance of the temperature field is minimized when they are embedded into the combustion chamber walls. As a result, it is observed that the behaviour of instantaneous temperature and heat flux depends on the radius of the measured point. Measured points located radially inwards seem to be influenced by the combustion flame considerably more than those located outwards because the flame is presumed to stay in and around the cavity which occupies a region around the central axis of the piston. On the other hand, the heat loss ratio, namely the ratio of lost heat to the heat supplied by the fuel, is larger than in a gasoline engine. © IMechE 2005.

引用

页码：119 / 135

页数：16

共 17 条

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