Assessment of The Impact of Multiple Injection Strategies on Combustion Noise, Smoke and Performance Characteristics of a CRDI Heavy Diesel Engine
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Abstract
This experimental research paper presents the impact of 5 different multiple injection strategies as 2-double comprising pilot-Main (pM), Main-after (Ma), 2-triple comprising pilot-Main-after (pMa), early-pilot-Main (epM) and quadruple comprising early-pilot-Main-after (epMa) in comparison with single injection on combustion noise (CN), Brake Specific Fuel Consumption (BSFC), Torque, Brake Thermal Efficiency (BTE) and Smoke emissions. The experimental evaluation was carried out on a 6-cylinder inline CRDI (Common rail Direct Injection) diesel engine in low temperature combustion (LTC) regime with high EGR of 45%, and fixed main injection Crank Angle (CA) using conventional diesel (BS-IV) fuel at full load and 8 speeds (low to high). The comprehensive study revealed that quadruple (epMa) injection strategy is superior in providing optimum results in comparison to other 4 multiple injection strategies in line to single injection. This strategy displayed better BSFC at medium to high speeds zone inline to reduce of combustion noise (radiated) level especially at low speeds around 2 dBA. The epMa exhibited the 2nd best smoke/soot concentration whereas pMa injection scheduling is best in lower smoke/soot generation. The epMa was found to be an optimum in torque performance though epM showed best torque performance in low to medium speed zone. The epMa showed the best BTE than all other. This work indicates the potentiality and further scope to achieve better performance and emissions simultaneously with quadruple injection strategy by parametric optimization of injection parameters.
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