Effects of Intake Temperature and Excessive Air Coefficient on Combustion Characteristics and Emissions of HCCI Combustion

Zhang, Chunhua; Pan, Jiangru; Juan-juan, Tong; Li, Jing

doi:10.1016/j.proenv.2011.12.169

Cited by 28 publications

(5 citation statements)

References 6 publications

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“…Thus, combustion gets advanced with the increase in intake air temperature [76]. It was reported that every 10°C rise in intake temperature increases the reaction rate by 2-4 times when other parameters remain constant [77]. Rich mixture ignition is favourable at low air temperature and lean mixture ignition is favourable at high air temperature.…”

Section: Intake Air Temperaturementioning

confidence: 99%

Current trends on combustion control methods using fuel reactivities

Sankaralingam¹,

Venugopal²

2016

Int. J. Automot. Mech. Eng.

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Compression ignition (CI) engines are used in heavy duty engine applications due to their high torque capability and thermal efficiency. However, high NOx and smoke emissions are the challenges in using CI engines. Homogeneous charge compression ignition (HCCI) is one of the best methods to reduce NOx and smoke emissions. However, controlling the combustion for an entire range of operation in HCCI mode is a challenging task. Different methods like fast thermal management (FTM), exhaust gas recirculation (EGR), turbo charging and reactivity controlled compression ignition (RCCI) are reviewed and discussed in this article. RCCI is similar to HCCI, which uses reactivities of two different fuels to control combustion. The combustion objectives of HCCI such as less NOx and soot emission can also be obtained through this method. Combustion control based on reactivities of various fuels (RCCI) is discussed significantly. Fuels that have different reactivities can help to control the combustion phasing and thereby reducing the emission. Two different fuels can be injected together into the manifold or one fuel can be injected in the port and other in the combustion chamber directly for reactivity based combustion control. The technological development in different combustion control methods is reviewed and discussed in this article which is a useful knowledge base for further research investigations. When compared to other combustion control methods, RCCI is found to be advantageous in all perspectives such as cost, flexibility in control, simplicity and wide range of operation.

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Section: Intake Air Temperaturementioning

confidence: 99%

Current trends on combustion control methods using fuel reactivities

Sankaralingam¹,

Venugopal²

2016

Int. J. Automot. Mech. Eng.

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“…This Φ O deterioration increases peak soot emissions, which are 17.7% higher for the short versus long layout, as shown in Figure 9. As for NO x emissions, the long mixing circuit slightly reduces the intake temperature by passing through an additional intercooler, resulting in a slight decrease of approximately 2% in peak NO x emissions [40]. The short mixing circuit's uneven exhaust gas distribution produces substantial Φ 𝑂 variations.…”

Section: The Effect Of High-pressure Egr Systems On Transient Processmentioning

confidence: 99%

Study on the Effects of Exhaust Gas Recirculation and Fuel Injection Strategy on Transient Process Performance of Diesel Engines

2023

Sustainability

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To meet increasingly stringent emission regulations, this study investigates the transient process of a heavy-duty diesel engine equipped with a two-stage turbocharger. The study focuses on analyzing the impact of the EGR system and fuel injection strategy during a transient process of a load increase (20% to 100% in 1 s) at a constant speed (1300 rpm). The research results showed that delaying the opening time of the high-pressure EGR valve from 0.1 s to 0.5 s reduces peak carbon soot emissions by 51.3%, with only a 3.13% increase in NOx emissions. By extending the high-pressure exhaust gas recirculation mixing length, the issue of an excessively high fuel–oxygen equivalence ratio caused by uneven exhaust gas mixing in individual cylinders can be avoided, resulting in a maximum reduction of 47.0% in peak soot emissions. Building on exhaust gas recirculation optimization, further modifications to the main and post-injection strategies led to a 28.1% reduction in soot emissions, a 4.73% decrease in peak NOx emissions, and a minor increase of 1.87% in the indicated fuel specific consumption compared to the single-injection strategy. The significant reduction in soot emissions will provide benefits for public health and environmental sustainability.

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“…The temperature at the end of combustion increases with the increase of inlet air temperature. Higher combustion temperature improves the oxidation reactions [16,34]. It causes to reduce unburned hydrocarbon molecules.…”

Section: Exhaust Emissionsmentioning

confidence: 99%

“…It was also found that HC emissions increased at full load with the increase of engine speed. Chun-hua et al [16] tested methanol, ethanol and gasoline in a HCCI engine via warming up the inlet air temperature. It was concluded that maximum cylinder pressure increased as inlet air temperature increased.…”

Section: Introductionmentioning

confidence: 99%