A Spectroscopic Study of the Effects of Multicomponent Fuel Blends on Supercharged HCCI Combustion

2012 ◽  
Author(s):  
Mitsuo Asanuma ◽  
Akira Iijima ◽  
Koji Yoshida ◽  
Hideo Shoji ◽  
Go Emori
Keyword(s):  
Spectroscopic Study ◽  
Fuel Blends ◽  
Hcci Combustion

An experimental and modeling study to investigate effects of different injection parameters on a direct injection HCCI combustion fueled with ethanol–gasoline fuel blends

Fuel ◽  
2018 ◽  
Vol 215 ◽  
pp. 879-891 ◽  
Author(s):  
Gokhan Coskun ◽  
Usame Demir ◽  
Hakan S. Soyhan ◽  
Ali Turkcan ◽  
Ahmet N. Ozsezen ◽  
...  
Keyword(s):  
Direct Injection ◽  
Fuel Blends ◽  
Hcci Combustion ◽  
Injection Parameters ◽  
Modeling Study

scholarly journals A study of supercharged hcci combustion characteristics using dme/methane fuel blends

2016 ◽  
Vol 82 (835) ◽  
pp. 15-00414-15-00414 ◽  
Author(s):  
Hirotaka SUZUKI ◽  
Takahiro SHIMA ◽  
Yuki TAKAMURA ◽  
Akira IIJIMA ◽  
Hideo SHOJI
Keyword(s):  
Combustion Characteristics ◽  
Fuel Blends ◽  
Hcci Combustion

A predictive 0-D HCCI combustion model for ethanol, natural gas, gasoline, and primary reference fuel blends

Fuel ◽  
2019 ◽  
Vol 237 ◽  
pp. 658-675 ◽  
Author(s):  
Yingcong Zhou ◽  
Deivanayagam Hariharan ◽  
Ruinan Yang ◽  
Sotirios Mamalis ◽  
Benjamin Lawler
Keyword(s):  
Natural Gas ◽  
Combustion Model ◽  
Fuel Blends ◽  
Hcci Combustion ◽  
Primary Reference

scholarly journals The Effect of Iso-Octane Addition on Combustion and Emission Characteristics of a HCCI Engine Fueled With n-Heptane

2011 ◽  
Vol 133 (11) ◽  
Author(s):  
Cosmin E. Dumitrescu ◽  
Hongsheng Guo ◽  
Vahid Hosseini ◽  
W. Stuart Neill ◽  
Wallace L. Chippior ◽  
...  
Keyword(s):  
Combustion Efficiency ◽  
Liquid Volume ◽  
Emission Characteristics ◽  
Oxygenated Hydrocarbons ◽  
Hcci Engine ◽  
Fuel Blends ◽  
Hcci Combustion ◽  
Unburned Hydrocarbons ◽  
Unburned Fuel ◽  
Multizone Model

This paper investigates the effects of iso-octane addition on the combustion and emission characteristics of a single-cylinder, variable compression ratio, homogeneous charge compression ignition (HCCI) engine fueled with n-heptane. The engine was operated with four fuel blends containing up to 50% iso-octane by liquid volume at 900 rpm, 50:1 air-to-fuel ratio, no exhaust gas recirculation, and an intake mixture temperature of 30°C. A detailed analysis of the regulated and unregulated emissions was performed including validation of the experimental results using a multizone model with detailed fuel chemistry. The results show that iso-octane addition reduced HCCI combustion efficiency and retarded the combustion phasing. The range of engine compression ratios where satisfactory HCCI combustion occurred was found to narrow with increasing iso-octane percentage in the fuel. NOx emissions increased with iso-octane addition at advanced combustion phasing, but the influence of iso-octane addition was negligible once CA50 (crank angle position at which 50% heat is released) was close to or after top dead center. The total unburned hydrocarbons (THC) in the exhaust consisted primarily of alkanes, alkenes, and oxygenated hydrocarbons. The percentage of alkanes, the dominant class of THC emissions, was found to be relatively constant. The alkanes were composed primarily of unburned fuel compounds, and iso-octane addition monotonically increased and decreased the iso-octane and n-heptane percentages in the THC emissions, respectively. The percentage of alkenes in the THC was not significantly affected by iso-octane addition. Iso-octane addition increased the percentage of oxygenated hydrocarbons. Small quantities of cycloalkanes and aromatics were detected when the iso-octane percentage was increased beyond 30%.

Physics Based Control Oriented Model for HCCI Combustion Timing

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Mahdi Shahbakhti ◽  
Charles Robert Koch
Keyword(s):  
Exchange Process ◽  
Computation Time ◽  
Integral Model ◽  
Average Error ◽  
Fuel Blends ◽  
Hcci Combustion ◽  
Fuel Burn ◽  
Primary Reference ◽  
Coupling Dynamics ◽  
Burn Rate

Incorporating homogeneous charge compression ignition (HCCI) into combustion engines for better fuel economy and lower emission requires understanding the dynamics influencing the combustion timing in HCCI engines. A control oriented model to dynamically predict cycle-to-cycle combustion timing of a HCCI engine is developed. The model is designed to work with parameters that are easy to measure and to have low computation time with sufficient accuracy for control applications. The model is a full-cycle model and consists of a residual gas model, a modified knock integral model, fuel burn rate model, and thermodynamic models. In addition, semi-empirical correlations are used to predict the gas exchange process, generated work and completeness of combustion. The developed model incorporates the thermal coupling dynamics caused by the residual gases from one cycle to the next cycle. The model is parameterized by over 5700 simulations from a detailed thermokinetic model and experimental data obtained from a single-cylinder engine. Cross-validation of the model with both steady-state and transient HCCI experiments for four different primary reference fuel blends is detailed. With seven model inputs, the combustion timing of over 150 different HCCI points is predicted to within an average error of less than 1.5 deg of crank angle. A narrow window of combustion timing is found to provide stable and efficient HCCI operation.

Some Results of the Spectroscopic Study of Four Close Binary Systems of Early Spectral Types

1965 ◽  
Vol 5 ◽  
pp. 120-130
Author(s):  
T. S. Galkina
Keyword(s):  
Spectroscopic Study ◽  
Spectral Type ◽  
Spectroscopic Investigation ◽  
Binary Systems ◽  
Quantitative Information ◽  
Close Binary ◽  
Physical Parameters ◽  
Absorption And Emission ◽  
Close Binary Systems ◽  
Quantitative Estimates

It is necessary to have quantitative estimates of the intensity of lines (both absorption and emission) to obtain the physical parameters of the atmosphere of components.Some years ago at the Crimean observatory we began the spectroscopic investigation of close binary systems of the early spectral type with components WR, Of, O, B to try and obtain more quantitative information from the study of the spectra of the components.

A spectroscopic study of soil fulvic acid composition after six-year applications of urban waste compost

Agronomie ◽  
2003 ◽  
Vol 23 (8) ◽  
pp. 719-724 ◽  
Author(s):  
Giovanni Gigliotti ◽  
Alceo Macchioni ◽  
Cristiano Zuccaccia ◽  
Pier Lodovico Giusquiani ◽  
Daniela Businelli
Keyword(s):  
Spectroscopic Study ◽  
Fulvic Acid ◽  
Acid Composition ◽  
Urban Waste
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