Effect of Stratified Rich and High Turbulence Combustion on the Reduction of NOx and Particulate Emissions from a Dl Diesel Engine
This study tried to find a concept of low emission combustion in a direct-injection diesel engine. Experiment was carried out to investigate the effects of high-pressure injection and high squish combustion chamber on combustion process and emissions. The high squish combustion chamber has a small throat diameter. The chamber intends to realize the simultaneous reduction of NOX and particulate emissions. The chamber produces high turbulence and effectively forms stratified rich mixture region under the squish lip. NOX reduction as well as high turbulence combustion is caused in the region. Results show that this chamber produces low particulate emissions under the condition of relatively lower injection pressure compared with the conventional toroidal chamber. When injection timing is retarded, peak heat release rate tends to decrease and diffusion combustion is promoted for the high squish chamber, although peak heat release rate increases with retarding injection timing for the toroidal chamber. Accordingly, it is possible for the high squish chamber to retard injection timing later than the toroidal chamber, leading to produce lower NOX with less deterioration of particulate emissions. Moreover, the high squish chamber further reduces NOX with little deterioration of particulate emissions and fuel consumption by introducing CO2 and N2 to intake air.
KeywordsCombustion Total Heat Hydrocarbon Diesel Smoke
Unable to display preview. Download preview PDF.
- Bianchi, G.M., et al. (2000) Numerical Study of the Combustion Chamber Shape for Common Rail H.S.D.I. Diesel Engines: SAE paper 2000–01–1179.Google Scholar
- Kidoguchi, Y., Miwa, K. and Mohammadi, A. (2001) Reduction Mechanism of NOx in Rich and High Turbulence Diesel Combustion: COMODIA2001: pp.108–114.Google Scholar
- Kidoguchi, Y., Yang, C. and Miwa, K. (1999) Effect of high Squish Combustion Chamber on Simultaneous Reduction of NOx and Particulate from a Direct–Injection Diesel Engine: SAE paper 1999–01–1502.Google Scholar
- Mattarelli, E., et al. (2001) Experimental and Numerical Investigation on the EGR System of a New Automotive Diesel Engine: SAE paper 2001–01–0224.Google Scholar
- Middlemiss, I.D. (1978) Characteristics of the Perkins `Squish Lip’ Direct Injection Combustion System: SAE paper 780113.Google Scholar
- Miwa, K., Ueda, T. and Ishiyama, T. (1991) Effect of Swirl on Particulate Emissions from Direct-Injection Diesel Engines: Trans. of JSME, Vol. 57, No. 538, pp. 2159–2166.Google Scholar
- Nakakita, K., et al. (1994) Optimization of Pilot Injection Pattern and Its Effect on Diesel Combustion with High-Pressure Injection: JSME Int. J., Series B, Vol.37, No.4, pp. 966973.Google Scholar
- Pierpont, D.A. and Reitz, R.D. (1995) Effects of Injection Pressure and Nozzle Geometry on D.I. Diesel Emissions and Performance: SAE paper 950604.Google Scholar
- Sakata, I., et al. (1990) Development of TOYOTA Reflex Burn (TRB) System in DI Diesel: SAE paper 900658.Google Scholar
- Shundoh, S., et al. (1991) The Effect of Injection Parameters and Swirl on Diesel Combustion with High Pressure Fuel Injection: SAE paper 910489.Google Scholar
- Shundoh, S., et al. (1992) NOx Reduction from Diesel Combustion Using Pilot Injection with High Pressure Fuel Injection: SAE paper 920461.Google Scholar