Combustion Temperature In Cylinder Research Articles

Experimental study on ultra-low raw emissions in diesel/methanol dual fuel engine based on dual-loop EGR

In this paper, an experimental investigation on achieving ultra-low raw emissions in a diesel/methanol dual fuel engine based on dual-loop EGR was carried out. The effect of dual-loop EGR (High pressure EGR and low pressure EGR) on the combustion, performance and emissions of methanol engine has been studied comprehensively. The results show that ultra-low NOx (<0.4g/kWh) and PM (<10 mg/kWh) emissions can be achieved simultaneously in diesel methanol dual fuel engine with the help of EGR. The combustion phase is delayed with the increase of EGR rate in both EGR modes. However, the methanol equivalence ratio and in cylinder combustion temperature in high pressure EGR mode are significantly higher than those in low pressure EGR mode. Therefore, the CO and THC emissions are obviously lower in high pressure EGR mode than that in low pressure EGR mode. The combustion efficiency and brake thermal efficiency of the engine are 1.9% and 9.6% higher in high pressure EGR mode than those in low pressure EGR mode, respectively.

Enhancement of combustion characteristics and emissions reductions of a diesel engine using biodiesel and carbon nanotube

The rise in fuel demand and lack of petroleum products helped to find diesel oil replacement. Therefore, in this study, we evaluated the corn biodiesel and its combustion characteristics improvements by the carbon-nanotube additive. The biodiesel (methyl-ester) was produced by transesterification process, as it was mixed with crude diesel (B20) to enhance the engine performance and emissions reductions of a diesel engine. The effect of blending three different carbon nanotube (CNTs) concentrations of 25, 50 and 100 ppm with biodiesel was also studied. The experimental results showed that the B20CNT100 improved the thermal efficiency by up to 15% compared to B20, B20CNT25 and B20CNT50 fuels. Furthermore, the CO, HC and smoke emissions were significantly decreased to 10, 16 and 22% respectively at the B20CNT100 blend. The maximum peak cylinder pressure, heat release, ignition delay and cylinder combustion temperature were decreased to 1.5%, 4%, 31% and 2.5% at full load, respectively. Consequently, in light of the findings of this study, the blended biodiesel with CNTs improved the diesel engine performance, combustion characteristics and reduction in emissions and the B20CNT100 produced the best performance and environmental impact.

Simulation Research of the Effect of Compression Ratios on Combustion and Emission for Methanol/Diesel Dual Fuel Engine

This paper has studied the influence of the different ratio on combustion process and emissions of air premixed methanol/diesel dual fuel engine. The research was based on 4B26 diesel engine, and the 3-D numerical simulation on combustion process and emissions of the diesel engine with intake premixed methanol was carried out using AVL FIRE software. The study showed that,with the compression ratio reducing,the ignition delay period prolonged, and the ignition timing delayed, the maximum firing pressure, the peak of pressure rise rate and the maximum combustion temperature in cylinder decreased, the crank angle postponed, the NOX emission decreased and the Soot emission increased obviously.

A Comparative Analysis of Different Cycle Diesel Engine Based on Three-Dimensional Simulation

The thermodynamic cycle analysis of diesel engines using the engine cycle simulation programs is feasible. The comparison of dual and LIVC miller cycles engine fueled with ED10 diesel/ethanol blends on temperature and emissions are investigated by simulation. From the comparison, +0.85 EIVC miller cycle is a selection for an optimizing point of miller cycle ratio, i.e, the intake valve timing of the engine is good for NO emission, SOOT emission and the engine power output. The difference of EIVC and LIVC miller cycle was studied. The results show the tendency of performance with EIVC miller cycle is similar to that of LIVC miller cycle. But the peak cylinder combustion temperature of EIVC miller cycle become lower relative to LIVC miller cycle, which lead to slightly lower NO emission and slightly higher SOOT emission for EIVC miller cycle.

Research on the Stratified Charge Control of the Nitrogen-Enriched Intake Air

Nitrogen-enriched intake air (NEA) can reduce the formation of NOx by inhibiting the combustion temperature in cylinder. This paper discusses the research progress on engines using NEA. The result indicates that nitrogen-enriched air can reduce engine NOx emissions remarkably. Besides, this paper analyzes the basic characteristics of the stratified charge control of the nitrogen-enriched intake air. In order to optimize the nitrogen stratification charge, a new nitrogen direct injection engine of stratified charge has been designed.

Review of Stratified Charge Research in Oxygen-Enriched and Nitrogen-Enriched Combustion

This paper discusses combustion and emissions of internal combustion engine when oxygen-enriched combustion air and nitrogen-enriched combustion air are used. Nitrogen-enriched combustion can reduce the formation of NOx by inhibiting the combustion temperature in cylinder. Engine combustion is mainly subject to components of oxygen and nitrogen in the intake, the former combustion and the latter flame retardant. So we can control the two components during combustion process to re-engineering their component in the intake to the implementation control the combustion and emissions.