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A Study of Heat Rejection and Combustion Characteristics of a Low-temperature and Pre-mixed Combustion Concept Based on Measurement of Instantaneous Heat Flux in a Direct-Injection Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 16, 2000 by SAE International in United States
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There have been strong demands recently for reductions in the fuel consumption and exhaust emissions of diesel engines from the standpoints of conserving energy and curbing global warming. A great deal of research is being done on new emission control technologies using direct-injection (DI) diesel engines that provide high thermal efficiency. This work includes dramatic improvements in the combustion process. The authors have developed a new combustion concept called Modulated Kinetics (MK), which reduces smoke and NOx levels simultaneously by reconciling low-temperature combustion with pre-mixed combustion [1, 2]. At present, research is under way on the second generation of MK combustion with the aim of improving emission performance further and achieving higher thermal efficiency . Reducing heat rejection in the combustion chamber is effective in improving the thermal efficiency of DI diesel engines as well as that of MK combustion. In this study, experimental investigations were conducted to examine transient heat transfer in a single-cylinder DI diesel engine. Transient surface temperature data obtained from the piston cavity and piston head were used as the basis for determining the transient heat flux rates. The results showed the heat rejection level of MK combustion and the effects of a combustion control parameter incorporated in this combustion concept. The results also made clear the effects of the fuel injection parameters of a common rail injection system, including their respective influence during MK combustion. Based on these results, this paper discusses the effects of combustion control parameters on transient heat transfer in the combustion chamber as well as on combustion characteristics, including their influences during MK combustion. It also describes the reasons why fuel consumption does not deteriorate during MK combustion under a retarded injection timing and presents a general approach to improving the thermal efficiency of DI diesel engines further.
CitationOgawa, H., Kimura, S., Koike, M., and Enomoto, Y., "A Study of Heat Rejection and Combustion Characteristics of a Low-temperature and Pre-mixed Combustion Concept Based on Measurement of Instantaneous Heat Flux in a Direct-Injection Diesel Engine," SAE Technical Paper 2000-01-2792, 2000, https://doi.org/10.4271/2000-01-2792.
Combustion and Emissions Formation in SI and Diesel Engines
Number: SP-1562; Published: 2000-10-16
Number: SP-1562; Published: 2000-10-16
- Matsui Y. Kimura S. Koike M. “A New Combustion Concept for Small DI Diesel Engines: Introduction of the Basic Technology (I)” JSAE Technical Paper 9730416
- Kimura S. Matsui Y. Koike M. “A New Combustion Concept for Small DI Diesel Engines: Effects on Engine Performance (II)” JSAE Technical Paper 973505
- Kimura S. Aoki O. Ogawa H. Muranaka S. “New Combustion Concept for Ultra-Clean and High-Efficiency Small DI Diesel Engines” SAE Technical Paper 1999-01-3681
- Takeda Y. Nakagome K. Niimura K. “Emission Characteristics of Premixed Lean Diesel Combustion with Extremely Early Staged Fuel Injection” SAE Technical Paper 961163
- Yanagihara H. Sato Y. Mizuta J. “A Study of DI Diesel Combustion under Uniform-Higher Disparaged Mixture Formation” The 13th International Combustion Engine Symposium Lecture 365 369 1976
- Kawashima J. Ogawa H. Tsuru Y. “Research on a Variable Swirl Intake Port for 4-Valve High-Speed DI Diesel Engines” SAE Technical Paper 982680
- Enomoto Y. Ishii A. Kimura S. Iida N. “Thin Film Thermocouple for Instantaneous Surface Temperature of a Metallic and Ceramic Combustion Chamber Wall” IMechE Paper C496/011/95 1995
- Kimura S. Matsui Y. Koike M. Enomoto Y. “Study of Heat Rejection Mechanism of a Direct-Injection Diesel Engine -1st Report: Characteristics of Local Heat Flux-” JSME Technical Paper 96-1871, 63-613B 1997
- Kimura S. Matsui Y. Itoh T. “Effects of Combustion Chamber Insulation on the Heat Rejection and Thermal Efficiency of Diesel Engines” SAE Technical Paper 920543
- Kimura S. Matsui Y. Ogawa H. Enomoto Y. “Effects of Combustion Chamber Specifications and Swirl Ratio on Performance of Light-Duty DI Diesel Engines” FISITA96 1994
- Ogawa H. Kimura S. Matsui Y. “Three-Dimensional Computation of the Effects of the Swirl Ratio in Direct-Injection Diesel Engines on NOx and Soot Emissions” SAE Technical Paper 961125