Effect of nitrogen and hydrogen addition on performance and emissions in reactivity controlled compression ignition

Fuel ◽  
2021 ◽  
Vol 292 ◽  
pp. 120330
Author(s):  
Sohayb Bahrami ◽  
Kamran Poorghasemi ◽  
Hamit Solmaz ◽  
Alper Calam ◽  
Duygu İpci
Keyword(s):  
Compression Ignition ◽  
Reactivity Controlled Compression Ignition ◽  
Hydrogen Addition ◽  
Performance And Emissions

Reactivity Controlled Compression Ignition Performance With Renewable Fuels

2012 ◽  
Author(s):  
Scott J. Curran ◽  
James P. Szybist ◽  
Robert M. Wagner
Keyword(s):  
High Efficiency ◽  
Fuel Injection ◽  
Combustion Process ◽  
Renewable Fuels ◽  
Compression Ignition ◽  
Reactivity Controlled Compression Ignition ◽  
Engine Efficiency ◽  
Fuel Charge ◽  
Performance And Emissions ◽  
Ethanol Blends

Reactivity controlled compression ignition (RCCI) combustion makes use of in-cylinder blending of two fuels with differing reactivity to tailor the reactivity of the fuel charge for improved control of the combustion process. This approach has been shown in simulations and engine experiments to have the potential for high efficiency with very low NOX and particulate matter (PM) emissions. Previous multi-cylinder RCCI experiments have been completed to understand the potential of this approach under more real-world conditions in a light-duty multi-cylinder engine (MCE) with production viable hardware. MCE experiments explored fuel injection strategy, dilution levels, piston geometry (including compression ratio), and fuel properties. Many renewable fuels have unique properties which enable expanded operation of advanced combustion methods for higher engine efficiency and lower energy requirements for emissions control devices. This study investigates the effect that renewable gasoline and diesel fuel replacements have on the load-expansion of RCCI, performance and emissions. The study focuses on ethanol blends for replacement of gasoline as the port-injected fuel (PFI) and biodiesel blends as the replacement for the direct injected (DI) fuel.

Effect of the ramp injection rate shape on the performance and emissions of a natural gas/diesel dual fuel engine

2021 ◽  
pp. 146808742110591
Author(s):  
Tara Yazdani Motlagh ◽  
Leila N Azadani
Keyword(s):  
Natural Gas ◽  
Great Influence ◽  
Injection Rate ◽  
Compression Ignition ◽  
Characteristic Parameters ◽  
Reactivity Controlled Compression Ignition ◽  
Performance And Emission ◽  
Compression Ignition Engines ◽  
Performance And Emissions ◽  
Unburned Hydrocarbons

Injection rate shape has a great influence on the spray evolution, and consequently on the performance and emission characteristics of compression ignition engines. In this study, effect of different ramp injection rate shapes on the performance and exhaust emissions of a natural gas/diesel reactivity controlled compression ignition (RCCI) engine was investigated. 64 numerical experiments were performed to study effect of two characteristic parameters of the ramp injection rate shape, including ramp duration and ramp injection rate on the engine gross indicated efficiency (GIE) and emissions formation. It was realized that for a constant value of the ramp duration, the engine gross indicated efficiency and [Formula: see text] emissions are lower, and CO and unburned hydrocarbons (UHC) emissions are higher for medium values of the ramp injection rate. Moreover, for a constant value of the ramp injection rate, the engine gross indicated efficiency and [Formula: see text] emissions are higher, and CO and unburned hydrocarbons emissions are lower for medium values of the ramp duration. The optimum values of the ramp duration and ramp injection rate were determined and it was revealed that the optimum ramp injection rate shape can improve the engine gross indicated efficiency by 54.78%.

scholarly journals Effect of Injection Timing and Injection Duration of Manifold Injected Fuels in Reactivity Controlled Compression Ignition Engine Operated with Renewable Fuels

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4621
Author(s):  
P. A. Harari ◽  
N. R. Banapurmath ◽  
V. S. Yaliwal ◽  
T. M. Yunus Khan ◽  
Irfan Anjum Badruddin ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Injection Timing ◽  
Compression Ignition ◽  
Cylinder Pressure ◽  
Compression Ignition Engine ◽  
Compressed Natural Gas ◽  
Reactivity Controlled Compression Ignition ◽  
Brake Thermal Efficiency ◽  
Injection Duration ◽  
Fuel Mixtures

In the current work, an effort is made to study the influence of injection timing (IT) and injection duration (ID) of manifold injected fuels (MIF) in the reactivity controlled compression ignition (RCCI) engine. Compressed natural gas (CNG) and compressed biogas (CBG) are used as the MIF along with diesel and blends of Thevetia Peruviana methyl ester (TPME) are used as the direct injected fuels (DIF). The ITs of the MIF that were studied includes 45°ATDC, 50°ATDC, and 55°ATDC. Also, present study includes impact of various IDs of the MIF such as 3, 6, and 9 ms on RCCI mode of combustion. The complete experimental work is conducted at 75% of rated power. The results show that among the different ITs studied, the D+CNG mixture exhibits higher brake thermal efficiency (BTE), about 29.32% is observed at 50° ATDC IT, which is about 1.77, 3.58, 5.56, 7.51, and 8.54% higher than D+CBG, B20+CNG, B20+CBG, B100+CNG, and B100+CBG fuel combinations. The highest BTE, about 30.25%, is found for the D+CNG fuel combination at 6 ms ID, which is about 1.69, 3.48, 5.32%, 7.24, and 9.16% higher as compared with the D+CBG, B20+CNG, B20+CBG, B100+CNG, and B100+CBG fuel combinations. At all ITs and IDs, higher emissions of nitric oxide (NOx) along with lower emissions of smoke, carbon monoxide (CO), and hydrocarbon (HC) are found for D+CNG mixture as related to other fuel mixtures. At all ITs and IDs, D+CNG gives higher In-cylinder pressure (ICP) and heat release rate (HRR) as compared with other fuel combinations.

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