Experimental Study on Unregulated Emission Characteristics of Turbocharged DI Diesel Engine with Common Rail Fuel Injection System

The paper presents characterisations of nanoparticle number in exhaust gases from biodiesel blends (B30, 30% of RME by volume with ultra low sulphur diesel fuel, ULSD) combustion in a V6 diesel engine equipped with a common rail fuel injection system. The engine was operated on three steady-state test points extracted from the New European Driving Cycle without engine hardware or the engine management system (EMS) modification. A fast differential mobility spectrometer was used to determine particle number size distribution based on electrical mobility equivalent diameter. The distribution was dependent on the engine operating condition and the rate of exhaust gas recirculation (EGR). The particle size in the nucleation mode from B30 combustion with and without EGR is smaller than that of ULSD while giving higher number concentration for all engine operating conditions tested. However, in the accumulation mode with and without EGR, the smaller sizes and the lower total numbers from B30 combustion were observed. For both fuels, EGR shows insignificant changes to the primary particle size but noticeable increase in particle size and number in the accumulation mode. In overall, compared to the ULSD case, the B30 combustion reduced particle size and lowered total particle number in exhaust gas emitted from the engine with EGR.

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Effect of Injection System Parameters on Performance and Emission Characteristics of a Small Single Cylinder Diesel Engine

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.18.2.2021.17.0673 ◽

2021 ◽

Vol 18 (2) ◽

Author(s):

D.K. Dond ◽

N.P. Gulhane

Keyword(s):

Diesel Engine ◽

Fuel Injection ◽

Direct Injection ◽

Common Rail ◽

Injection System ◽

Injection Timing ◽

Emission Characteristics ◽

Performance And Emission ◽

System Parameters ◽

Main Injection

Limited fossil fuel reservoir capacity and pollution caused by them is the big problem in front of researchers. In the present paper, an attempt was made to find a solution to the same. The conventional fuel injection system was retrofitted with a simple version of the common rail direct injection system for the small diesel engine. Further, the effect of injection system parameters was observed on the performance and emission characteristics of the retrofitted common rail direct injection diesel engine. The parameters such as injection pressure, the start of pilot injection timing, the start of main injection timing and quantity of percentage fuel injection during the pilot and main injection period were considered for experimental investigation. It was observed that all the evaluated parameters were found vital for improving the engine’s performance and emission characteristics. The retrofitted common rail direct injection system shows an average 7% rise in brake thermal efficiency with economic, specific fuel consumption. At the same time, much more reduction in hydrocarbon, carbon monoxide and smoke opacity with a penalty of a slight increase in nitrogen oxides.

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EFFECT OF PILOT INJECTION OF DIMETHYL ETHER DIRECT-INJECTION ENGINE ON PERFORMANCE AND EMISSION CHARACTERISTICS USING COMMON RAIL FUEL INJECTION SYSTEM

JP Journal of Heat and Mass Transfer ◽

10.17654/hm016020283 ◽

2019 ◽

Vol 16 (2) ◽

pp. 283-295

Author(s):

Seomoon Yang ◽

Changhee Lee

Keyword(s):

Dimethyl Ether ◽

Fuel Injection ◽

Direct Injection ◽

Common Rail ◽

Injection System ◽

Emission Characteristics ◽

Fuel Injection System ◽

Pilot Injection ◽

Direct Injection Engine ◽

Performance And Emission

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Combustion and Emission Characteristics of Direct-Injection Compression Ignition Engines by Means of Two-Stage Split and Early Fuel Injection

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.1473157 ◽

2002 ◽

Vol 124 (3) ◽

pp. 660-667 ◽

Cited By ~ 11

Author(s):

K. Yamane ◽

Y. Shimamoto

Keyword(s):

Diesel Engine ◽

Fuel Injection ◽

Direct Injection ◽

Injection System ◽

Emission Characteristics ◽

Diesel Combustion ◽

Compression Ignition ◽

Two Stage ◽

Di Diesel Engine ◽

Early Injection

The objective of this study was to experimentally clarify the effect of two-stage split and early injection on the combustion and emission characteristics of a direct-injection (DI) diesel engine. Engine tests were carried out using a single-cylinder high-speed DI diesel engine and an injection system, combining an ordinary jerk pump and an electronically controlled high-pressure injection system, KD-3. In these experiments to compare the combustion and exhaust emission characteristics with two-stage split and early injection, a single-stage and early injection was tested. The FT-IR exhaust-gas analyzer simultaneously measured the exhaust emissions of 26 components. The results showed that HCHO, CH3CHO, and CH3COOH were emitted during the very early stage of both single injection and two-stage injection. These concentrations were higher than those from diesel combustion with ordinary fuel injection timings. These exhaust emissions are characteristic components of combustion by premixed compression ignition with extremely early injection. In particular, the HCHO concentration in exhaust was reduced with an increase in the maximum rate of heat release after cool flame due to pre-reaction of pre-mixture. At extremely early injection, the NOx concentration was extremely low; however, the indicated specific fuel consumption (ISFC) was higher than that of ordinary diesel combustion. In the case of two-stage injection, the degree of constant volume is increased, so that ISFC is improved. These results also demonstrated the possibility of reducing HCHO, NOx, and smoke emissions by means of two-stage split and early injection.

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