Effect of Narrow Cut Oil Shale Derived Distillates on HCCI Engine Performance

2009 ◽  
Author(s):  
Scott J. Eaton ◽  
Bruce G. Bunting ◽  
Samuel A. Lewis ◽  
Craig Fairbridge
Keyword(s):  
Oil Shale ◽  
Engine Performance ◽  
Hcci Engine

Numerical Study on Effect of Hydrogen Peroxide Additive on Ethanol HCCI Engine

2012 ◽  
Vol 433-440 ◽  
pp. 244-250 ◽  
Author(s):  
Tian Li ◽  
Jun Deng ◽  
Tang Tang Bao ◽  
Zhi Jun Wu
Keyword(s):  
Hydrogen Peroxide ◽  
Numerical Study ◽  
Engine Performance ◽  
Chemical Mechanism ◽  
No Production ◽  
Cylinder Pressure ◽  
Ethanol Mixture ◽  
Hcci Engine ◽  
Engine Model ◽  
Production Mechanisms

In this article, based on a combined chemical mechanism with detailed ethanol oxidization and NO production mechanisms, a single cylinder ethanol HCCI engine model was established using the software CHEMKIN. Comparing with experimental data, this model can well predict cylinder pressure and NO emission. By changing mole fraction of hydrogen peroxide in initial ethanol mixture at different conditions, the effect of hydrogen peroxide additive on ethanol HCCI engine performance was investigated. The results show that hydrogen peroxide can effectively improve cylinder pressure and advance heat release progress, without notably increasing NO production.

A Comprehensive Study on Natural Gas HCCI Engine Response to Different Initial Conditions via a Thermo-Kinetic Engine Model

2009 ◽  
Author(s):  
Omid Jahanian ◽  
Seyed Ali Jazayeri
Keyword(s):  
Natural Gas ◽  
Initial Conditions ◽  
Chemical Species ◽  
Engine Performance ◽  
Operating Conditions ◽  
Zone Model ◽  
Operating Characteristics ◽  
Hcci Engine ◽  
Engine Model ◽  
Homogenous Charge Compression Ignition

Homogenous Charge Compression Ignition (HCCI) combustion is a promising concept to reduce engine emissions and fuel consumption. In this paper, a thermo-kinetic model is developed to study the operating characteristics of a natural gas HCCI engine. The zero-dimensional single zone model consist detail chemical kinetics of natural gas oxidation including 325 reactions with 53 chemical species, and is validated with experimental results of reference works for two different engines, Volvo TD 100 and Caterpillar 3500, in 5 operating conditions. Then, the influence of parameters such as manifold temperature/pressure and equivalence ratio on in-cylinder temperature/pressure trends and start of combustion is studied. Measurements for Volvo engine show that SOC occurs 3–5 CAD earlier with every 15K increase in initial temperature. These whole results are explained in detail to describe the engine performance thoroughly.

Cylinder-to-Cylinder Variations in a V6 Gasoline Direct Injection HCCI Engine

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Jacek Misztal ◽  
Hongming Xu ◽  
Miroslaw L. Wyszynski ◽  
Athanasios Tsolakis ◽  
Jun Qiao
Keyword(s):  
Direct Injection ◽  
Pressure Rise ◽  
Engine Performance ◽  
Gasoline Direct Injection ◽  
Experimental Investigations ◽  
Inlet Temperature ◽  
Split Injection ◽  
Hcci Engine ◽  
Combustion Technology ◽  
Cam Profile

Despite the fact that homogeneous charge compression ignition (HCCI) has been demonstrated as a combustion technology feasible for implementation with different fuels in various types of engines, cylinder-to-cylinder variations (CTCVs) in multicylinder HCCI engines remain one of the technical obstacles to overcome. A reduction in CTCV requires further developments in control technology. This study has been carried out with regard to the overall engine parameters, involving geometric differences between individual cylinders, coolant paths through the engine, combustion chamber deposits, and also the differences in the inlet temperature distributions between the cylinders. Experimental investigations on the Jaguar V6 HCCI research engine with negative valve overlapping and cam profile switching show that the differences in the rate of pressure rise between the cylinders can be larger than 1 bar/CA deg and that the load differences can be as high as 5–10%. It has been found that some individual cylinders will approach the misfiring limit far earlier than the others. The complex interaction between a number of parameters makes the control of the multicylinder engine a serious challenge. In order to avoid these differences, an active cylinder balancing strategy will be required. It has been observed that spark assistance and split injection strategy deliver the best control for the cylinder balance. However, spark assistance is restricted to low loads and low engine speeds, while split injection requires a considerable effort to optimize its possible settings. This paper defines the most important parameters influencing cylinder-to-cylinder variations in the HCCI engine and aims to put forward suggestions that can help to minimize the effect of cylinder-to-cylinder variations on the overall engine performance.

scholarly journals A thermo-kinetic model base study on natural gas HCCI engine response to different initial conditions

2009 ◽  
Vol 136 (1) ◽  
pp. 90-99
Author(s):  
Seyed JAZAYERI ◽  
Jahanian OMID
Keyword(s):  
Natural Gas ◽  
Initial Conditions ◽  
Chemical Species ◽  
Engine Performance ◽  
Zone Model ◽  
Model Base ◽  
Hcci Engine ◽  
Hcci Combustion ◽  
Base Study ◽  
Homogenous Charge Compression Ignition

Homogenous Charge Compression Ignition (HCCI) combustion is a promising concept to reduce engine emmisions and fuel consumption. In this paper, a thermo-kinetic single zone model is developed to study the operation characteristics of a natural gas HCCI engine. The model consists detail chemical kinetics of natural gas oxidation including 325 reactions with 53 chemical species, and is validated with experimental results of reference works. Then, the influence of parameters such as manifold temperature/pressure, and equivalance ratio on incylinder temperature/pressure trends, start of combustion and heat release rate is studied. These results are explained in detail to describe the engine performance thoroughly.

scholarly journals Simulation of predictive kinetic combustion of single cylinder HCCI engine

2020 ◽  
Author(s):  
Ibham Veza ◽  
Mohd Farid Muhamad Said ◽  
Zulkarnain Abdul Latiff ◽  
Mohd Faizal Hasan ◽  
Rifqi Irzuan Abdul Jalal ◽  
...  
Keyword(s):  
Heat Release ◽  
Air Temperature ◽  
Engine Performance ◽  
Zone Model ◽  
Hcci Engine ◽  
Hcci Combustion ◽  
Temperature Heat ◽  
Performance And Emissions ◽  
Improved Performance ◽  
Start Of Combustion

Homogeneous Charge Compression Ignition (HCCI) engine has attracted great attention due to its improved performance and emissions compared to conventional engines. It can reduce both Nitrogen Oxides (NOx) and Particulate Matter (PM) emissions simultaneously without sacrificing the engine performance. However, controlling its combustion phasing remains a major challenge due to the absence of direct control mechanism. The start of combustion is entirely initiated by the chemical reactions inside the combustion chamber, resulted from the compression of its homogeneous mixtures. Varying some critical engine parameters can play a significant role to control the combustion phasing of HCCI engine. This paper investigates the characteristics of HCCI combustion fuelled with n-heptane (C7H16) using single-zone model computational software. The model enabled the combustion object to vary from cycle to cycle. Detailed simulations were conducted to evaluate the effects of air fuel ratio (AFR), compression ratio (CR) and intake air temperature on the in-cylinder pressure and heat release rate. The simulation results showed that the single-zone model was able to predict the two-stage kinetic combustion of HCCI engine; the Low Temperature Heat Release (LTHR) and the High Temperature Heat Release (HTHR) regions. It was found that minor changes in AFR, CR and inlet air temperature led to major changes in the HCCI combustion phasing.

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