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Experimental Investigation of Combustion Stability and Particle Emission from CNG/Diesel RCCI Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
This paper presents the experimental investigation of combustion stability and nano-particle emissions from the CNG/diesel RCCI engine. A modified automotive diesel engine is used to operate in RCCI combustion mode. An open ECU is used to control the low and high reactivity fuel injection events. Engine tests are conducted for different engine speed and load conditions. The tests are performed for various port fuel injected CNG masses and diesel injection timing including single and double diesel injection strategy. Several consecutive engine cycles are recorded using in-cylinder combustion pressure measurement. Statistical as well as Wavelet transform techniques are used to investigate the combustion stability in CNG/diesel RCCI engine. Differential mobility spectrometer is used for the measurement of particle number concentration and particle-size number distribution. The results indicate that double injection strategy has relatively higher concentration of nucleation mode particles and increases with advancing the diesel injection timings. Double diesel injection results in to reduced cyclic combustion variations in comparison to double diesel injection strategy. Additionally, CO and THC emissions are increasing with advanced diesel injection timing and are relatively lower for double injection strategy.