Effects of Injection Pressure, Timing and EGR on Combustion and Emissions Characteristics of Diesel PCCI Engine

Kiplimo, Robert; Tomita, Eiji; Kawahara, Nobuyuki; Zhou, Shiyu; Yokobe, Sumito

doi:10.4271/2011-01-1769

Cited by 16 publications

(6 citation statements)

References 19 publications

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“…The authors found that EGR increases the ignition delay and decreases the heat release during ignition, and then effectively suppresses engine knock. Kiplimo et al [7] studied the effects of EGR on combustion and emission characteristics of a diesel premixed charge compression ignition (PCCI) engine. They found that EGR leads to extended ignition delay which is essential in mixture formation before ignition, improved indicated mean effective pressure (IMEP) and hence improved thermal efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effects of Buffer Gas Composition on Autoignition of Dimethyl Ether

et al. 2015

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Abstract:Experimental and numerical studies are conducted on the thermal, chemical and dilution effects of buffer gas composition on autoignition of dimethyl ether (DME). The buffer gases considered are nitrogen (N2), a mixture of N2 and argon (Ar) at a mole ratio of 50%/50% and a mixture of Ar and carbon dioxide (CO2) at a mole ratio of 61.2%/38.8%. Experiments are performed using a rapid compression machine (RCM) at compressed pressure of 10 bar, equivalence ratio (φ) of 1, and compressed temperature from 670 K to 795 K. The N2 dilution ratio considered ranges from 36.31% to 55.04%. The experimental results show that buffer gas composition has little impact on the first-stage ignition delay. However, significant differences in the total ignition delay as a function of buffer gas composition are observed in the negative temperature coefficient (NTC) region. Compared to N2, N2/Ar (50%/50%) mixture decreases the total ignition delay by 31%. The chemical effects of buffer gas composition on the first-stage and total ignition delays are negligible. With increasing N2 dilution ratio, the first-stage ignition delay slightly increases, while a significant increase in the total ignition delay is observed. Moreover, the NTC behavior of total ignition delay is noted to become more pronounced at high N2 dilution ratio. The heat release during the first-stage ignition decreases as N2 dilution ratio increases. Results of OPEN ACCESSEnergies 2015, 8 10199 numerical simulations with the Zhao DME mechanism over a wider range of temperature show good agreement with that of experiments. Further numerical simulations are conducted using pure N2, Ar and CO2 as buffer gases. Results indicate that the thermal effects are the dominant factor in low temperature and NTC regions. The chemical effects become pronounced in the NTC region, and the chemical effect of CO2 exceeds the thermal effect at the compressed temperature higher than 880 K.

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Section: Introductionmentioning

confidence: 99%

Effects of Buffer Gas Composition on Autoignition of Dimethyl Ether

et al. 2015

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“…The dual effect of EGR and QSoPI on smoke is showcased in Figure 8(b). The figure shows a rise in smoke emission with increased EGR% and QSoPI [44]. The impact of IP on smoke emissions is presented in Figure 8(c).…”

Section: Smoke Emissionsmentioning

confidence: 91%

Combustion noise characterization and optimization of PCCI combustion using response surface methodology

Datta Bharadwaz Yellapragada,

Kumari

2023

JMES

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The current work aims at characterizing the premixed charge compression ignition (PCCI) combustion with regression-based approach using response surface methodology. PCCI operating parameters such as load, pilot injection timing, main injection timing, pilot injection quantity, exhaust gas recirculation and injection pressure are considered as input variables. Engine performance indicators such as brake thermal efficiency, brake specific fuel consumption, carbon monoxide (CO), hydrocarbon (HC), oxide of nitrogen (NOx), smoke emissions, combustion phasing and combustion noise metric ringing intensity are considered as output responses. Experimental results validate the optimal solution from response surface methodology approach, and good agreement is found between mathematical models and experimental results. Comparative examination of optimized PCCI combustion versus conventional combustion showed a 66% and 44% decrement in NOx and smoke emissions. Except for CO and HC emissions, the percentage penalty of other responses with PCCI combustion is less than 10%. In addition to ringing intensity another combustion noise metric combustion noise level is computed from Fast Fourier Transform (FFT) analysis of cylinder pressure trace. A combustion noise level of 73.26 dB is obtained at optimized conditions.

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“…Conventional premixed combustion is realized by using a high Exhaust Gas Recirculation (EGR) rate combined with early fuel injection to provide sufficient time to produce a lean and homogenous mixture (4) . However, the early fuel injection results in increased HC and CO emissions from fuel adherence on the piston head and cylinder wall (5) . Another disadvantage of PCCI combustion is limited operating range due to misfire and engine knock (6) .…”

Section: Introductionmentioning

confidence: 99%

Investigation on Effect of Offset Orifice Nozzle under Multi Pulse UltrahighPressure Injection and PPC Combustion Conditions

Ewphun

Otake

Nagasawa

et al. 2020

IJAE

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The effect of nozzle orifice design on combustion characteristics under multi pulse ultra high pressure injection and PPC conditions. The objective of offset orifice nozzle is to shorten spray penetration and improve mixture formation in order to increase thermal efficiency. The offset orifice nozzle was designed by shift orifice aliment from into the sac center to edge of sac follow swirl direction. The experiments were carried out on a single cylinder engine at 0.55MPa gross IMEP at 1,750 RPM and 0.7MPa gross IMEP at 2,000 RPM. The injection pulses were 3 pulses equally mass under injection pressure up to 350MPa.

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Effects of Injection Pressure, Timing and EGR on Combustion and Emissions Characteristics of Diesel PCCI Engine

Cited by 16 publications

References 19 publications

Effects of Buffer Gas Composition on Autoignition of Dimethyl Ether

Effects of Buffer Gas Composition on Autoignition of Dimethyl Ether

Combustion noise characterization and optimization of PCCI combustion using response surface methodology

Investigation on Effect of Offset Orifice Nozzle under Multi Pulse UltrahighPressure Injection and PPC Combustion Conditions

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