Emission and Noise Optimization of CRDe Engine with Pilot Injection Strategies

2019 ◽  
Author(s):  
Pranav Kumar Sinha ◽  
Anbarasu Muthusamy ◽  
Vagesh Shangar Ramani
Keyword(s):  
Pilot Injection ◽  
Noise Optimization ◽  
Injection Strategies

Early Pilot Injection Strategies for Reactivity Control in Diesel-ethanol Dual Fuel Combustion

2018 ◽  
Author(s):  
Shui Yu ◽  
Shouvik Dev ◽  
Zhenyi Yang ◽  
Simon Leblanc ◽  
Xiao Yu ◽  
...  
Keyword(s):  
Fuel Combustion ◽  
Dual Fuel ◽  
Pilot Injection ◽  
Dual Fuel Combustion ◽  
Injection Strategies

Numerical Investigation of Effect Pilot Injection on Combustion Noise and Exhaust Emission of Diesel Engine

2012 ◽  
Vol 472-475 ◽  
pp. 1528-1531
Author(s):  
Tie Min Xuan ◽  
Zhi Xia He ◽  
Zhao Chen Jiang ◽  
Yi Yan
Keyword(s):  
Diesel Engine ◽  
Numerical Investigation ◽  
Fuel Injection ◽  
Numerical Models ◽  
Combustion Noise ◽  
Exhaust Emission ◽  
Pilot Injection ◽  
Engine Combustion ◽  
Emission Models ◽  
Injection Strategies

Numerical Investigation of Effect Pilot Injection on Combustion Noise and Exhaust Emission of Diesel Engine The traditional mechanical fuel supply system has already been no way to satisfy the requirement of more stringent fuel consumption and emission legislation. For the past few years, it has been a hot topic to improve performance of diesel engine combustion and emission through optimizing the fuel injection strategy. All kinds of spray, combustion and emission models were studied and then the numerical models for the single-injection combustion of 1015 diesel engine were setup and validated through comparing with results from experimental data. With the above verified models, different injection strategies were further investigated to get the effect mechanism of pilot injection (PI) timing and quantity on combustion noise and exhaust emission.

Fuel efficiency analysis and peak pressure rise rate improvement for neat n-butanol injection strategies

2016 ◽  
Vol 231 (1) ◽  
pp. 50-65 ◽  
Author(s):  
Marko Jeftić ◽  
Zhenyi Yang ◽  
Graham T Reader ◽  
Ming Zheng
Keyword(s):  
Carbon Monoxide ◽  
Peak Pressure ◽  
Pressure Rise ◽  
Single Shot ◽  
Pilot Injection ◽  
Post Injection ◽  
Pressure Rise Rate ◽  
Rise Rate ◽  
Main Injection ◽  
Injection Strategies

Engine tests were conducted to investigate the efficiency and the peak pressure rise rate performance of different fuel injection strategies for the direct injection of neat n-butanol in a compression ignition engine. Three different strategies were tested: a single-shot injection; a pilot injection; a post-injection. A single-shot injection timing sweep revealed that early injections had the highest indicated efficiency while late injections reduced the peak pressure rise rate at the cost of a slightly reduced thermal efficiency. Delayed single-shot injections also had increased emissions of nitrogen oxides, total hydrocarbon and carbon monoxide. Addition of a pilot injection had a negative effect on the peak pressure rise rate. Because of the low cetane number of butanol and the relatively lean and well-premixed air–fuel mixture, the pilot injection failed to autoignite and instead ignited simultaneously with the main injection. This resulted in slightly increased peak pressure rise rates and significantly increased unburned butanol hydrocarbon emissions. Conversely, the use of an early post-injection produced a noticeable engine power output and allowed the main injection to be shortened and the peak pressure rise rate to be substantially reduced. However, relatively early post-injections slightly reduced the indicated efficiency and increased the nitrogen oxide emissions and the carbon monoxide emissions compared with the single-shot injection strategy. These results recommended the use of a single-shot injection for low loads and medium loads owing to a superior thermal efficiency and suggested that the application of a post-injection may be more suited to high-load conditions because of the substantially reduced peak pressure rise rates.

scholarly journals Effect of Premixed Fuel Preparation for Partially Premixed Combustion With a Low Octane Gasoline on a Light-Duty Multicylinder Compression Ignition Engine

2015 ◽  
Vol 137 (11) ◽  
Author(s):  
Adam B. Dempsey ◽  
Scott Curran ◽  
Robert Wagner ◽  
William Cannella
Keyword(s):  
High Pressure ◽  
Thermal Efficiency ◽  
Fuel Injection ◽  
Premixed Combustion ◽  
Injection System ◽  
Injection Timing ◽  
Pilot Injection ◽  
Compression Ignition ◽  
Partially Premixed Combustion ◽  
Injection Strategies

Gasoline compression ignition (GCI) concepts with the majority of the fuel being introduced early in the cycle are known as partially premixed combustion (PPC). Previous research on single- and multicylinder engines has shown that PPC has the potential for high thermal efficiency with low NOx and soot emissions. A variety of fuel injection strategies have been proposed in the literature. These injection strategies aim to create a partially stratified charge to simultaneously reduce NOx and soot emissions while maintaining some level of control over the combustion process through the fuel delivery system. The impact of the direct injection (DI) strategy to create a premixed charge of fuel and air has not previously been explored, and its impact on engine efficiency and emissions is not well understood. This paper explores the effect of sweeping the direct injected pilot timing from −91 deg to −324 deg ATDC, which is just after the exhaust valve closes (EVCs) for the engine used in this study. During the sweep, the pilot injection consistently contained 65% of the total fuel (based on command duration ratio), and the main injection timing was adjusted slightly to maintain combustion phasing near top dead center. A modern four cylinder, 1.9 l diesel engine with a variable geometry turbocharger (VGT), high pressure common rail injection system, wide included angle injectors, and variable swirl actuations was used in this study. The pistons were modified to an open bowl configuration suitable for highly premixed combustion modes. The stock diesel injection system was unmodified, and the gasoline fuel was doped with a lubricity additive to protect the high pressure fuel pump and the injectors. The study was conducted at a fixed speed/load condition of 2000 rpm and 4.0 bar brake mean effective pressure (BMEP). The pilot injection timing sweep was conducted at different intake manifold pressures, swirl levels, and fuel injection pressures. The gasoline used in this study has relatively high fuel reactivity with a research octane number of 68. The results of this experimental campaign indicate that the highest brake thermal efficiency (BTE) and lowest emissions are achieved simultaneously with the earliest pilot injection timings (i.e., during the intake stroke).

Pilot Injection Strategies for Medium-speed Dual-fuel Engines

2018 ◽  
Vol 8 (1) ◽  
pp. 48-55 ◽  
Author(s):  
Björn Henke ◽  
Sascha Andree ◽  
Bert Buchholz ◽  
Martin Theile
Keyword(s):  
Dual Fuel ◽  
Pilot Injection ◽  
Medium Speed ◽  
Dual Fuel Engines ◽  
Injection Strategies

scholarly journals Study of the soot quantification for two-stage injection of hydrogenated catalytic biodiesel in a constant-volume combustion chamber

2017 ◽  
Author(s):  
Cao Jiawei ◽  
He Zhixia ◽  
Li Bei ◽  
Zhong Wenjun ◽  
Wang Mei
Keyword(s):  
High Speed ◽  
Dwell Time ◽  
Pilot Injection ◽  
Two Stage ◽  
Injection Duration ◽  
Soot Mass ◽  
Constant Volume Combustion Chamber ◽  
Main Injection ◽  
Ambient Gas ◽  
Injection Strategies

The effect of two-stage injection strategies on the soot formation of 0# fossil diesel were investigated experimentally using a constant volume combustion chamber. The ambient conditions was kept constant as injection pressure 150 MPa, ambient gas temperature 900 K, ambient gas pressure 45 bar. A high-speed diffused back-illumination extinction imaging technique was employed to make quantitative measurement on temporal soot evolution and reacting spray liquid length and a direct high-speed camera was used to measure the ignition delay. Two-stage injection strategies were varied with different pilot and main injection time, including a sweep of dwell time in pilot-main injection and pilot injection duration. The results show that the ignition delay decreases with the increasing dwell time. It may result from the entrained surrounding gas enhance the spray combustion process. In the reacting condition, the liquid-phase penetration is slightly longer with the shorter dwell time. However, the pilot injection duration shows slighter impact. The longer dwell time contributes to more total soot mass while the different pilot injection duration barely affect the total soot mass of the main injection.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4739

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