Simulation of Combustion and Emission Characteristics in a Dual Fuelled Diesel Engine

2010 ◽  
Author(s):  
Biplab K. Debnath ◽  
Bibhuti B. Sahoo ◽  
Ujjwal K. Saha ◽  
Niranjan Sahoo
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Combustion Velocity ◽  
Premixed Combustion ◽  
Dual Fuel ◽  
Combustion Modeling ◽  
Tetrahedral Elements ◽  
Constant Volume Combustion Chamber ◽  
Computational Fluid Dynamics Cfd ◽  
Good Agreement

In this paper, Computational Fluid Dynamics (CFD) approach is adopted to study the combustion and emission progression in a single cylinder four stroke diesel engine, operated in both diesel and dual-fuel modes. The study of dual-fuel mode is performed by using synthesis gas (syngas) with 75:25 and 50:50 volumetric combinations of hydrogen and carbon monoxide, respectively. The modeling and meshing of the constant volume combustion chamber is carried out by using GAMBIT tool. The meshing of the combustion chamber is performed using tetrahedral elements and the k–ε turbulence model is introduced along with non-premixed combustion modeling. The modeled hemispherical-piston-top combustion chamber is then simulated in FLUENT solver across the experimental boundary conditions at 40%, 60%, 80% and 100% of full load for both diesel and dual-fuel. The results of simulation incorporate the study of maximum combustion temperature, maximum combustion velocity and H2O mole fraction subsequent to combustion. Further, the concentrations of emissions have also been investigated for both diesel and dual-fuel modes. The results of simulations show a good agreement with the corresponding experimental data.

Effect of Combustion Chamber Geometry on Emissions From a Single-Cylinder Diesel Engine

2005 ◽  
Author(s):  
Boggavarapu V. V. S. U. Prasad ◽  
R. V. Ravikrishna
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Direct Injection ◽  
Three Dimensional ◽  
Cfd Simulations ◽  
Government Regulations ◽  
Single Cylinder ◽  
Piston Bowl ◽  
Computational Fluid Dynamics Cfd ◽  
Valve Part

Many of the stationary power generation and agricultural pumping applications in India utilize diesel engines. Recently, as per Government regulations, these engines are required to satisfy stringent emissions norms. This forms the motivation for the present study on a stationary, direct-injection, single cylinder, 10 HP diesel engine. The selected engine was not satisfying the norms. The engine has a hemi- spherical piston bowl and an injector with a finite sac volume. The combustion chamber was made re-entrant and the injector was replaced with a sac-less injector. After these modifications, there is a significant change in emission levels. To understand clearly the effect of the combustion chamber geometry on the emission levels, three-dimensional computational fluid dynamics (CFD) simulations have been performed for the complete suction and closed-valve part of the cycle. Comparisons of turbulent kinetic energy and swirl levels of old and new geometries were systematically conducted. In contrary to the expected, that the swirl and turbulence levels are consistently less in the modified geometry than that of original geometry. A third combustion chamber was proposed and tested computationally. It was found that the in the proposed combustion chamber swirl and turbulence levels are much higher than the baseline engine. Thus, the proposed combustion chamber geometry shows significant potential for the engine to meet the prescribed norms.

scholarly journals Vibroactivity analysis of a dual fuel diesel engine based on the knock sensor signal and measuring pressure in the combustion chamber

2017 ◽  
Vol 19 (4) ◽  
pp. 2354-2362 ◽  
Author(s):  
Łukasz Zieliński ◽  
Krzysztof Szczurowski ◽  
Łukasz Kurkus ◽  
Damian Walczak
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Dual Fuel ◽  
Sensor Signal ◽  
Knock Sensor

scholarly journals Diesel to Dual Fuel Conversion Process Development

2018 ◽  
Vol 7 (3.6) ◽  
pp. 306
Author(s):  
Kompalli Bhavani ◽  
Sivanesan Murugesan
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Process Development ◽  
Pollutant Emissions ◽  
Dual Fuel ◽  
Economic Costs ◽  
Fuel Conversion ◽  
Compressed Natural Gas ◽  
Alternate Fuel ◽  
Auto Ignition

This paper aims to develop a process for conversion of Diesel Engine for Dual Fuel operation which is basically designed to reduce the economic costs and pollutant Emissions. The increasing cost of Diesel Fuel leads to the necessity of an Alternate fuel, i.e Compressed Natural gas (CNG).  In this research a 16 cylinder, 50.25liter, Turbocharged After cooler V-shaped Engine is used for the conversion into Dual Fuel Engine. Dual fuel engine can be operated on both Diesel and CNG modes simultaneously. In this Engine the Air and CNG are mixed in required ratios in an Air- Gas mixer and the mixture is injected into the Combustion chamber. As Gaseous fuel CNG cannot self-ignite itself because of its high Auto ignition temperature a required amount of Diesel is injected into the Combustion Chamber at the end of compression stroke for ignition purpose which is known as Secondary fuel or a PILOTFUEL. This paper tries to show the process development of converting Diesel Engine for dual fuel operation on multiple platforms. 

Effect of nozzle and combustion chamber geometry on the performance of a diesel engine operated on dual fuel mode using renewable fuels

2016 ◽  
Vol 93 ◽  
pp. 483-501 ◽  
Author(s):  
V.S. Yaliwal ◽  
N.R. Banapurmath ◽  
N.M. Gireesh ◽  
R.S. Hosmath ◽  
Teresa Donateo ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Dual Fuel ◽  
Renewable Fuels

Influence of Key Structural Parameters of Combustion Chamber on the Performance of Diesel Engine

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Xinhai Li ◽  
Yong Cheng ◽  
Shaobo Ji ◽  
Xin Lan
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Dynamic Characteristics ◽  
Peak Pressure ◽  
Structural Parameters ◽  
Structural Parameter ◽  
Engine Combustion ◽  
Computational Fluid Dynamics Cfd ◽  
Soot Emissions ◽  
No Emissions

The structural parameters of combustion chamber have great impacts on the process of air–fuel mixing, combustion, and emissions of diesel engine. The dynamic characteristics and emission performances could be improved by means of optimizing the parameters of the combustion chamber. In this paper, the key structure of a diesel engine combustion chamber is parameterized, and the influence of individual structural parameter on dynamic characteristics and emissions of the engine is simulated and analyzed by computational fluid dynamics (CFD) software avl-fire. The results show that under constant compression ratio, the in-cylinder peak pressure decreases with increasing inclination angle of the combustion chamber (α), while the height (Tm) and bowl radius (R) have little influence on the in-cylinder peak pressure. With increasing α, NO emissions decrease, and soot emissions first increase and then decrease. With increasing R, both NO and soot emissions decrease first and then increase. Therefore, the combustion chamber parameters could be optimized by comprehensive consideration of cylinder pressure, NO and soot emissions.

On the Computer-Aided Conversion of a Diesel Engine to CNG-Dedicated or Dual Fuel Combustion Regime

2012 ◽  
Author(s):  
Teresa Donateo ◽  
Arturo de Risi ◽  
Domenico Laforgia
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Cfd Simulation ◽  
Combustion Regime ◽  
Fuel Combustion ◽  
Dual Fuel ◽  
Combustion Chambers ◽  
Analytical Methodology ◽  
Design Alternatives ◽  
Dual Fuel Combustion

The paper proposes a cost-saving analytical methodology using empirical based models to efficiently evaluate design alternatives in the optimization of a CNG converted diesel engine. The procedure is performed in five steps. Firstly, a database of different combustion chambers that can be obtained from the original piston is obtained. The chambers in the database differ for the shape of the bowl, the value of the compression ratio, the offset of the bowl and the size of the squish region. The second step of the procedure is the selection, from the first database, of the combustion chambers able to resist to the mechanical stresses due to the pressure and temperature distribution at full load. For each combination of suitable combustion chamber shape and ignition timing, a CFD simulation is used to evaluate the combustion performance of the engine. Then, a post-processing procedure is used to evaluate the detonation tendency and intensity of each combination. All the tools developed for the application of the method have been linked in the ModeFrontier optimization environment in order to perform the final choice of the combustion chamber. The overall process requires not more of a week of computation on the 4 processor servers considered for the optimization. Moreover, the selected chambers can be obtained from the original piston of the engine. Therefore, the conversion cost of the engine is quite small compared with the case of a completely new piston. The procedure can be applied to diesel engines to be converted to either CNG dedicated or dual fuel combustion. The main aspects and challenges to be taken into account in both cases are also analyzed.

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