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Effect of exhaust gas recirculation on diesel combustion

Hribernik A., Samec N.

Journal of KONES

2004

Vol. 11, No. 1-2

223-231

Exhaust gas recirculation (EGR) is effective for the reduction of NOx emission from internal combustion engines. Although there has been extensive experimental research on emission formation by the application of EGR, little has been devoted to the diesel combustion process. An attempt was made to study experimentally the combustion process at different EGR rates and engine loads. A heavy duty turbocharged diesel engine was used for the tests and a Iow pressure EGR concept was applied. Different EGR rates were obtained simply by the position of EGR control valve. Exhaust gases were analysed for emissions of NOx, CO, H C and soot. In-cylinder pressure t race s were measured and analysed. A one-zone combustion model was used to compute the rate of heat release from the experimental results. Several combustion parameters such as ignition delay, duration of pre-mixed and diffusion flame, combustion duration, etc., were determined and carefully studied, and basic correlation is presented and discussed in this paper.

Stretching the limits of an old engine dynamometer with a new data acquisition system

Bombek G., Hribernik A.

Journal of KONES

2003

Vol. 10, No. 3-4

15-22

Even though numerical simulations offer a lot of Information and can reduce the costs and the time for development, engine testing is still necessary. The main difference from 10 or 20 years ago is that more data is required and that the tests are more sophisticated. New trends and the legislation call for an automated testing. Many laboratories have dynamometers, which are still in working order, but do not offer the performances needed for testing. A way how to improve the testing capability by the use of modern data acquisition system with an existing dynamometer is presented in this article. The system enables testing of the external characteristics of an engine, testing over prescribed testing modes, testing of the acceleration of the engine and acquisition of large amount of data including engine torque, speed, temperatures and pressures.