HC3-3: Prediction of Ignition Timing and Combustion Process in Gasoline HCCI Engines by Means of Zero-dimensional Chemical Kinetics Calculation in Consideration of Combustion Characteristic Time(HC: HCCI Combustion,General Session Papers)

2008 ◽  
Vol 2008.7 (0) ◽  
pp. 321-328
Author(s):  
Hideki Takase ◽  
Yogo Takada ◽  
Tomoyuki Wakisaka
Keyword(s):  
Chemical Kinetics ◽  
Characteristic Time ◽  
Combustion Process ◽  
Combustion Characteristic ◽  
Ignition Timing ◽  
General Session ◽  
Hcci Combustion ◽  
Hcci Engines

Development of a Highly Reduced Mechanism for Iso-Octane HCCI Combustion With Targeted Search Algorithm

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Y. F. Tham ◽  
F. Bisetti ◽  
J.-Y. Chen
Keyword(s):  
Numerical Simulations ◽  
Chemical Kinetics ◽  
Search Algorithm ◽  
Compression Ignition ◽  
New Approach ◽  
Reduced Mechanism ◽  
Hcci Combustion ◽  
Hcci Engines ◽  
Start Of Combustion ◽  
Skeletal Mechanism

This paper describes recent development of iso-octane skeletal and reduced mechanisms for speeding up numerical simulations of homogeneous charge compression ignition (HCCI) engines. A novel targeted search algorithm is developed to systematically screen species for quasisteady state (QSS) assumption in order to reduce the mechanism size while maintaining accuracy. This new approach is especially found useful when the chemical kinetics involve complex ignition pathways. Using the iso-octane mechanism developed by LLNL, a skeletal mechanism with 215 species (Skeletal-215) and a reduced mechanism with 63 non-QSS species (Reduced-63) were constructed. Evaluations of the performances of the Skeletal-215 and the Reduced-63 were extensively conducted for the operation regimes in HCCI engine applications. Both mechanisms are found satisfactory in predicting start of combustion and minor emission species.

Analysis of the HCCI Combustion of a Turbocharged Truck Engine Using a Stochastic Reactor Model

2002 ◽  
Author(s):  
Luca Montorsi ◽  
Fabian Mauss ◽  
Gian Marco Bianchi ◽  
Amit Bhave ◽  
Markus Kraft
Keyword(s):  
Numerical Simulation ◽  
Combustion Process ◽  
Critical Issue ◽  
Chemical Kinetic ◽  
Reactor Model ◽  
Hcci Combustion ◽  
Hcci Engines ◽  
Homogeneous Reactor ◽  
Power Code ◽  
Truck Engine

Homogeneous Charge Compression Ignition (HCCI) engines arouse great interest due to their high thermal efficiency and very low emissions of nitrogen oxides (NOx) and particulates. Critical issue of the HCCI combustion is the control of the engine since the combustion process is mostly dominated by chemical kinetics. Therefore the accurate assessment of the chemical kinetic is fundamental in numerical simulation of this kind of engines. Experimentally it has been demonstrated that even in HCCI engine the charge within the cylinder is not fully homogeneous, but many quantities, such as temperature, density and equivalence ratio, vary along the combustion chamber. These inhomogeneities influence the combustion process and yield the homogeneous reactor model to be not completely adequate to simulate HCCI combustion. This paper focuses on the use of a stochastic rector model in order to account for temperature inhomogeneities in the numerical simulation of the HCCI combustion. Moreover, the chemical kinetic code has been coupled to GT – Power Code, a 1-D fluid – dynamics code, in order to accurately simulate the operation of a turbocharged truck engine.

Effect of Internal Exhaust Gas Recycling on n-Heptane HCCI Combustion

2005 ◽  
Author(s):  
Usman Asad ◽  
Ming Zheng ◽  
David S.-K. Ting ◽  
Graham T. Reader
Keyword(s):  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Combustion Process ◽  
Temperature History ◽  
Exhaust Gas ◽  
Ignition Timing ◽  
Operating Range ◽  
Hcci Combustion ◽  
Gas Recycling

Homogeneous Charge Compression Ignition (HCCI) combustion is currently limited in application due to several key issues such as a narrow operating range, high hydrocarbon and carbon monoxide emissions and lack of control over the onset of combustion. Exhaust gas recycling (EGR) has the potential to 1) provide reasonable control over the HCCI combustion process and 2) extend its operating range. In this paper, the effect of hot internal EGR on ignition timing and heat release rate of HCCI combustion fuelled with n-heptane has been investigated using the CHEMKIN 0-D closed combustion engine simulation package. An attempt has been made to study the effect of individual components of EGR on cylinder-temperature history and the rate of chemical reaction. The results indicate that combustion initiation is directly linked to the thermal energy contained in the hot EGR but the particular chemical species contained in the EGR have different influences towards ignition timing and heat release rate. This theoretical study would be substantiated by experimental work in the near future.

scholarly journals Effects of EGR and Alternative Fuels on Homogeneous Charge Compression Ignition (HCCI) Combustion Mode

2021 ◽  
Vol 16 (2) ◽  
pp. 135-144
Author(s):  
Saliha Mohammed Belkebir ◽  
Benyoucef Khelidj ◽  
Miloud Tahar Abbes
Keyword(s):  
Alternative Fuels ◽  
Ignition Time ◽  
Combustion Process ◽  
Chemical Species ◽  
Pollutant Emissions ◽  
Combustion Mode ◽  
Hcci Combustion ◽  
Hcci Engines ◽  
Homogeneous Reactor ◽  
Gas Recirculation

We present in this article an analysis of the impacts of the exhaust gas recirculation (EGR) and alternative fuels on HCCI combustion mode. The objective is to reduce the pollutant emissions below the levels of established pollution standards. The ANSYS CHEMKIN-Pro software and the combined chemical kinetics mechanism were used to perform simulations for a closed homogeneous reactor under conditions relevant to HCCI engines. The calculation process is based on one single-zone in the combustion chamber. Numerical simulation has proven the ability of the models adopted, which use the essential mechanisms of the fuel combustion process, to reproduce, among other things, the evolution of the formation of chemical species. This study showed that adding hydrogen (H2) to methane (CH4) is an interesting alternative fuel because it reduces ignition time. It was concluded that an increase of EGR rate conducts to a slower combustion process, lower temperatures, and the reduction of nitrogen oxide (NOX) emissions.

Analysis of the HCCI Combustion of a Turbocharged Truck Engine Using a Stochastic Reactor Model

2003 ◽  
Author(s):  
Luca Montorsi ◽  
Fabian Mauss ◽  
Gian Marco Bianchi ◽  
Amit Bhave ◽  
Markus Kraft
Keyword(s):  
Numerical Simulation ◽  
Combustion Process ◽  
Critical Issue ◽  
Chemical Kinetic ◽  
Reactor Model ◽  
Hcci Combustion ◽  
Hcci Engines ◽  
Homogeneous Reactor ◽  
Power Code ◽  
Truck Engine

Homogeneous Charge Compression Ignition (HCCI) engines arouse great interest due to their high thermal efficiency and very low emissions of nitrogen oxides (NOx) and particulates. Critical issue of the HCCI combustion is the control of the engine since the combustion process is mostly dominated by chemical kinetics. Therefore the accurate assessment of the chemical kinetic is fundamental in numerical simulation of this kind of engines. Experimentally it has been demonstrated that even in HCCI engine the charge within the cylinder is not fully homogeneous, but many quantities, such as temperature, density and equivalence ratio, vary along the combustion chamber. These inhomogeneities influence the combustion process and yield the homogeneous reactor model to be not completely adequate to simulate HCCI combustion. This paper focuses on the use of a stochastic rector model in order to account for temperature inhomogeneities in the numerical simulation of the HCCI combustion. Moreover, the chemical kinetic code has been coupled to GT - Power Code, a 1-D fluid–dynamics code, in order to accurately simulate the operation of a turbocharged truck engine.

A Two Zone Model of a Single Cylinder HCCI Engine for Control Applications

2008 ◽  
Author(s):  
Varun Tandra ◽  
Nilabh Srivastava
Keyword(s):  
Zone Model ◽  
Ignition Timing ◽  
Control Laws ◽  
Single Cylinder ◽  
First Law Of Thermodynamics ◽  
Hcci Engine ◽  
Hcci Combustion ◽  
Hcci Engines ◽  
Computationally Intensive ◽  
Peak Pressures

This paper presents a first step towards developing a physics-based two-zone model of a single cylinder HCCI engine. Previously control laws were derived by using single zone mathematical models of HCCI combustion; although certain multi-zone models were reported, they were found too complex and unwieldy for the development of fast and efficient controllers for HCCI engines. The present work outlines the modeling approach of a single-cylinder two-zone HCCI engine by incorporating the first law of thermodynamics and temperature and concentration inhomogeneities within the cylinder in order to better predict peak pressures and combustion timings. The results showed good conformity when compared with the computationally intensive multi-zone models. A comparative analysis between the single zone and two-zone models, in the context of predicting cylinder pressures, temperatures, ignition timing is also discussed. Moreover, the effect of external parameters such as speed, and EGR were also evaluated.

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