Extending the Load Range of a Natural Gas HCCI Engine using Direct Injected Pilot Charge and External EGR

2009 ◽  
Author(s):  
D. I. Handford ◽  
M. D. Checkel
Keyword(s):  
Natural Gas ◽  
Load Range ◽  
Hcci Engine

scholarly journals Combustion of premixed DME and natural gas in a HCCI engine

2005 ◽  
Vol 121 (2) ◽  
pp. 20-29
Author(s):  
Masahiro ISHIDA ◽  
Sukho JUNG ◽  
Hironobu UEKI ◽  
Daisaku SAKAGUCHI
Keyword(s):  
Natural Gas ◽  
Equivalence Ratio ◽  
Combustion Process ◽  
Reaction Rates ◽  
Gas Mixture ◽  
Temperature Reaction ◽  
Load Range ◽  
Hcci Engine ◽  
Test Engine ◽  
Ignition Characteristics

The objectives of the present study is to clarify ignition characteristics, the combustion process, the knock limit and the misfire limit of natural gas mixed with a small amount of dimethyl ether (DME) in a HCCI engine. In the combustion test, natural gas and a small amount of DME were charged into the suction air homogeneously. The equivalence ratio of natural gas was increased to find the knock limit or the misfire limit of the HCCI test engine under a constant DME amount. The effect of the natural gas addition on suppression of the low temperature reaction of DME, and the effects of the DME amount and the intake temperature on the reaction rates, the knock limit of the DME/natural gas mixture, and the operation load range of the HCCI engine were investigated experimentally.

scholarly journals Compression Ratio Influence on Maximum Load of a Natural Gas Fueled HCCI Engine

2002 ◽  
Author(s):  
Jan-Ola Olsson ◽  
Per Tunestål ◽  
Bengt Johansson ◽  
Scott Fiveland ◽  
Rey Agama ◽  
...  
Keyword(s):  
Natural Gas ◽  
Compression Ratio ◽  
Maximum Load ◽  
Hcci Engine ◽  
Gas Fueled

Ignition Characteristics of Methanol and Natural-Gas in a HCCI Engine Assisted by DME

2007 ◽  
Author(s):  
Sukho Jung ◽  
Masahiro Ishida ◽  
Hironobu Ueki ◽  
Daisaku Sakaguchi
Keyword(s):  
Natural Gas ◽  
Hcci Engine ◽  
Ignition Characteristics

Variable Composition Hydrogen/Natural Gas Mixtures for Increased Engine Efficiency and Decreased Emissions

1999 ◽  
Vol 122 (1) ◽  
pp. 135-140 ◽  
Author(s):  
R. Sierens ◽  
E. Rosseel
Keyword(s):  
Natural Gas ◽  
Exhaust Emissions ◽  
Pure Hydrogen ◽  
Operating Characteristics ◽  
Load Range ◽  
Engine Operation ◽  
High Hydrogen ◽  
Hydrogen Addition ◽  
Engine Efficiency ◽  
Engine Operating Condition

It is well known that adding hydrogen to natural gas extends the lean limit of combustion and that in this way extremely low emission levels can be obtained: even the equivalent zero emission vehicle (EZEV) requirements can be reached. The emissions reduction is especially important at light engine loads. In this paper results are presented for a GM V8 engine. Natural gas, pure hydrogen and different blends of these two fuels have been tested. The fuel supply system used provides natural gas/hydrogen mixtures in variable proportion, regulated independently of the engine operating condition. The influence of the fuel composition on the engine operating characteristics and exhaust emissions has been examined, mainly but not exclusively for 10 and 20 percent hydrogen addition. At least 10 percent hydrogen addition is necessary for a significant improvement in efficiency. Due to the conflicting requirements for low hydrocarbons and low NOx, determining the optimum hythane composition is not straight-forward. For hythane mixtures with a high hydrogen fraction, it is found that a hydrogen content of 80 percent or less guarantees safe engine operation (no backfire nor knock), whatever the air excess factor. It is shown that to obtain maximum engine efficiency for the whole load range while taking low exhaust emissions into account, the mixture composition should be varied with respect to engine load. [S0742-4795(00)02001-9]

Effects of Heterogeneous EGR on the Natural Gas Fueled HCCI Engine Using Experiments, CFD and Detailed Kinetics

2004 ◽  
Author(s):  
Ryuichi Tominaga ◽  
Satoshi Morimoto ◽  
Yasuharu Kawabata ◽  
Shigeto Matsuo ◽  
Toshiji Amano
Keyword(s):  
Natural Gas ◽  
Hcci Engine ◽  
Gas Fueled ◽  
Detailed Kinetics

scholarly journals Influence of Charge Motion and Compression Ratio on the Performance of a Combustion Concept Employing In-Cylinder Gasoline and Natural Gas Blending

2017 ◽  
Author(s):  
James Sevik ◽  
Michael Pamminger ◽  
Thomas Wallner ◽  
Riccardo Scarcelli ◽  
Steven Wooldridge ◽  
...  
Keyword(s):  
Natural Gas ◽  
Carbon Dioxide Emissions ◽  
Fuel Injection ◽  
Direct Injection ◽  
Peak Load ◽  
Charge Motion ◽  
Load Range ◽  
Absolute Increase ◽  
Efficient Operation ◽  
Indicated Mean Effective Pressure

The present paper represents a small piece of an extensive experimental effort investigating the dual-fuel operation of a light-duty spark ignited engine. Natural gas (NG) was directly injected into the cylinder and gasoline was injected into the intake-port. Direct injection of NG was used in order to overcome the power density loss usually experienced with NG port-fuel injection as it allows an injection after intake valve closing. Having two separate fuel systems allows for a continuum of in-cylinder blend levels from pure gasoline to pure NG operation. The huge benefit of gasoline is its availability and energy density, whereas NG allows efficient operation at high load due to improved combustion phasing enabled by its higher knock resistance. Furthermore, using NG allowed a reduction of carbon dioxide emissions across the entire engine map due to the higher hydrogen-to-carbon ratio. Exhaust gas recirculation (EGR) was used to (a) increase efficiency at low and part-load operation and (b) reduce the propensity of knock at higher compression ratios (CR) thereby enabling blend levels with greater amount of gasoline across a wider operating range. Two integral engine parameters, CR and in-cylinder turbulence levels, were varied in order to study their influence on efficiency, emissions and performance over a specific speed and load range. Increasing the CR from 10.5 to 14.5 allowed an absolute increase in indicated thermal efficiency of more than 3% for 75% NG (25% gasoline) operation at 8 bar net indicated mean effective pressure and 2500 RPM. However, as anticipated, the achievable peak load at CR 14.5 with 100% gasoline was greatly reduced due to its lower knock resistance. The in-cylinder turbulence level was varied by means of tumble plates as well as an insert for the NG injector that guides the injection “spray” to augment the tumble motion. The usage of tumble plates showed a significant increase in EGR dilution tolerance for pure gasoline operation, however, no such impact was found for blended operation of gasoline and NG.

F24 Effect of EGR on characteristics of combustion and exhaust emission in a DME/Natural Gas-HCCI engine

2006 ◽  
Vol 2006.59 (0) ◽  
pp. 153-154
Author(s):  
Daisuke NOGUCHI ◽  
Miki YOSHIMURA ◽  
Suk-ho JUNG ◽  
Masahiro ISHIDA ◽  
Hironobu UEKI
Keyword(s):  
Natural Gas ◽  
Exhaust Emission ◽  
Hcci Engine
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