Combustion Characteristics of HCCI of Hydrogen-Rich Gases Supported by Supplemental DME~Improvement in Thermal Efficiency by Hydrogen HCCI

2005 ◽  
Author(s):  
Yasuo Takagi ◽  
Shinichi Iio ◽  
Tomoyuki Yokoyama ◽  
Yusuke Narioka
Keyword(s):  
Thermal Efficiency ◽  
Combustion Characteristics

scholarly journals Improving the Thermal Efficiency of the Homogeneous Charge Compression Ignition Engine by Using Various Combustion Patterns

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3002 ◽  
Author(s):  
Yuh-Yih Wu ◽  
James H. Wang ◽  
Faizan Mushtaq Mir
Keyword(s):  
Thermal Efficiency ◽  
High Efficiency ◽  
Homogeneous Charge Compression Ignition ◽  
Combustion Engine ◽  
Combustion Characteristics ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Cycle Simulation ◽  
Homogeneous Charge ◽  
Wiebe Function

The efficiency of an internal combustion engine (ICE) is essential for automobiles and motorcycles. Several studies have demonstrated that the homogeneous charge compression ignition (HCCI) is a promising technology for realizing engines with high efficiency and low emissions. This study investigated the combustion characteristics of the HCCI using a 125 cc motorcycle engine with n-heptane fuel. The engine performance, combustion characteristics, and thermal efficiency were analyzed from experimental data. The results revealed that a leaner air–fuel mixture led to higher engine efficiency and output. The improvement of engine output is contradictory to the general trend. Energy balance analysis revealed that lower heat loss, due to the low cylinder gas temperature of lean combustion, contributed to higher efficiency. A double-Wiebe function provided excellent simulation of the mass fraction burned (MFB) of the HCCI. Air cycle simulation with the MFB, provided by the double-Wiebe function, was executed to investigate this phenomenon. The results indicated that a better combustion pattern led to higher thermal efficiency, and thus the engine output and thermal efficiency do not require a fast combustion rate in an HCCI engine. A better combustion pattern can be achieved by adjusting air–fuel ratio (AFR) and the rates of dual fuel and exhaust gas recirculation (EGR).

scholarly journals Analysis of Combustion Characteristics and Emission Characteristics of Alternative Fuels Worldwide

2021 ◽  
pp. 28-35
Author(s):  
Xu Da ◽  
Qin Fei ◽  
Li Xiangyang
Keyword(s):  
Thermal Efficiency ◽  
Alternative Fuels ◽  
Particle Diameter ◽  
Alternative Fuel ◽  
Combustion Characteristics ◽  
Dual Fuel ◽  
Emission Characteristics ◽  
Hydrogen Fuel ◽  
Nitrogen Oxide Emissions ◽  
Advantages And Disadvantages

The combustion characteristics and emission characteristics of the commonly used alternative fuels in the fuel process are reviewed, the three types of alternative fuels are: Alcohols alternative fuel, biological alternative fuel and gas alternative fuel. The three alternative fuels have their own advantages and disadvantages in combustion characteristics and emission characteristics. The dual fuel blended with alcohols has a higher burning rate than pure diesel or gasoline, and emits fewer soot particles. When biofuel is blended into traditional fuel, the thermal efficiency is improved, and the particle diameter of the emitted particles is smaller than that of pure diesel. The use of hydrogen fuel increases the power of the engine, and significantly reduces the content of CO and CO2 in the emissions. With the increase of the proportion of hydrogen, the amount of soot emitted becomes less, but the amount of nitrogen oxide emissions increases. Each of the three types of alternative fuels has its own characteristics and advantages.

Research of Fuel Components to Enhance Engine Thermal Efficiency Part II: Consideration of Engine Combustion Characteristics

2019 ◽  
Author(s):  
Nozomi Yokoo ◽  
Yoshinori Miyamoto ◽  
Koichi Nakata ◽  
Ken Obata ◽  
Taketora Naiki ◽  
...  
Keyword(s):  
Thermal Efficiency ◽  
Combustion Characteristics ◽  
Engine Combustion ◽  
Fuel Components
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