scholarly journals Modelling and analysis of some parameters of thermal cycle of IC engine with EGR

2011 ◽  
Vol 147 (4) ◽  
pp. 43-49
Author(s):  
Wojciech TUTAK
Keyword(s):  
Thermal Cycle ◽  
Combustion Engine ◽  
Exhaust Gas Recirculation ◽  
Spark Ignition ◽  
Exhaust Gas ◽  
No Emission ◽  
Ic Engine ◽  
Gas Recirculation ◽  
The Impact ◽  
Engine Cycle

The results of modelling of thermal cycle of spark ignition internal combustion engine with exhaust gas recirculation are presented. Results of the impact of EGR on the emission of NO in the exhaust and heat release rate are presented. The optimization of thermal cycle was carried out in terms of ignition advance angle in order to obtain the possible highest value of efficiency and the least NO emission. Optimizing the engine cycle, a compromise between the thermodynamic parameters of cycle and emissions can be reached.

scholarly journals An analysis of EGR impact on combustion process in the SI test engine

2012 ◽  
Vol 148 (1) ◽  
pp. 11-16
Author(s):  
Wojciech TUTAK
Keyword(s):  
Ignition Delay ◽  
Thermal Cycle ◽  
Combustion Engine ◽  
Combustion Process ◽  
Exhaust Gas ◽  
No Emission ◽  
Combustion Duration ◽  
Test Engine ◽  
Gas Recirculation ◽  
The Impact

The results of modelling of thermal cycle of spark ignition internal combustion engine with exhaust gas recirculation are presented. Results of the impact of EGR on the ignition delay and the combustion duration are presented. The optimization of thermal cycle was carried out in terms of ignition advance angle in order to obtain the possible highest value of efficiency and the least NO emission. The results indicated a significant impact of EGR on the ignition delay and combustion duration.

scholarly journals Experimental study on knock sources in spark ignition engine with exhaust gas recirculation

2018 ◽  
Vol 165 ◽  
pp. 35-44 ◽  
Author(s):  
Mladen Božić ◽  
Ante Vučetić ◽  
Momir Sjerić ◽  
Darko Kozarac ◽  
Zoran Lulić
Keyword(s):  
Experimental Study ◽  
Exhaust Gas Recirculation ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Exhaust Gas ◽  
Gas Recirculation

Control-Oriented Physics-Based NOX Emission Model for a Diesel Engine With Exhaust Gas Recirculation

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Saravanan Duraiarasan ◽  
Rasoul Salehi ◽  
Anna Stefanopoulou ◽  
Siddharth Mahesh ◽  
Marc Allain
Keyword(s):  
Diesel Engine ◽  
Test Procedure ◽  
Flame Temperature ◽  
Exhaust Gas Recirculation ◽  
Nox Emission ◽  
Injection Timing ◽  
Exhaust Gas ◽  
Engine Control ◽  
Gas Recirculation ◽  
The Impact

Abstract Stringent NOX emission norm for heavy duty vehicles motivates the use of predictive models to reduce emissions of diesel engines by coordinating engine parameters and aftertreatment. In this paper, a physics-based control-oriented NOX model is presented to estimate the feedgas NOX for a diesel engine. This cycle-averaged NOX model is able to capture the impact of all major diesel engine control variables including the fuel injection timing, injection pressure, and injection rate, as well as the effect of cylinder charge dilution and intake pressure on the emissions. The impact of the cylinder charge dilution controlled by the engine exhaust gas recirculation (EGR) in the highly diluted diesel engine of this work is modeled using an adiabatic flame temperature predictor. The model structure is developed such that it can be embedded in an engine control unit without any need for an in-cylinder pressure sensor. In addition, details of this physics-based NOX model are presented along with a step-by-step model parameter identification procedure and experimental validation at both steady-state and transient conditions. Over a complete federal test procedure (FTP) cycle, on a cumulative basis the model prediction was more than 93% accurate.

Quantification of knock benefits from reformate and cooled exhaust gas recirculation using a Livengood–Wu approach with detailed chemical kinetics

2016 ◽  
Vol 18 (7) ◽  
pp. 717-731 ◽  
Author(s):  
David K Marsh ◽  
Alexander K Voice
Keyword(s):  
Carbon Monoxide ◽  
Compression Ratio ◽  
Exhaust Gas Recirculation ◽  
Spark Ignition ◽  
Mitigation Strategies ◽  
Exhaust Gas ◽  
Spark Ignition Engines ◽  
Volume Percent ◽  
Hydroxy Radicals ◽  
Gas Recirculation

In this work, a simple methodology was implemented to predict the onset of knock in spark-ignition engines and quantify the benefits of two practical knock mitigation strategies: cooled exhaust gas recirculation and syngas blending. Based on the results of this study, both cooled exhaust gas recirculation and the presence of syngas constituents in the end-gas substantially improved the knock-limited compression ratio of the engine. At constant load, 25% exhaust gas recirculation increased the knock-limited compression ratio from 9.0 to 10.8:1 (0.07 compression ratio per 1% exhaust gas recirculation) due to lower end-gas temperature and reactant (fuel and oxygen) concentrations. At exhaust gas recirculation rates above 43%, higher intake temperature outweighed the benefits of lower end-gas reactant concentration. At constant intake temperature, cooled exhaust gas recirculation was significantly more effective at all exhaust gas recirculation rates (0.10 compression ratio per 1% exhaust gas recirculation), and no diminishing returns or optimum was observed. Both hydrogen and carbon monoxide were also predicted to improve knock by reducing end-gas reactivity, likely through the conversion of high-reactivity hydroxy-radicals to less reactive peroxy-radicals. Hydrogen increased the knock-limited compression ratio by 1.1 per volume percent added at constant energy content. Carbon monoxide was less effective, increasing the knock-limited compression ratio by 0.38 per volume percent added. Combining 25% cooled exhaust gas recirculation with reformate produced from rich combustion at an equivalence ratio of 1.3 resulted in a predicted increase in the knock-limited compression ratio of 3.5, which agreed well with the published experimental engine data. The results show the extent to which syngas blending and cooled exhaust gas recirculation each contribute separately to knock mitigation and demonstrate that both can be effective knock mitigation strategies. Together, these solutions have the potential to increase the compression ratio and efficiency of spark-ignition engines.

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