Investigation on the Characteristics of Biodiesel Droplets in the Engine Cylinder

Raza, Ali; Mehboob, Hassan; Miran, Sajjad; Arif, Waseem; Rizvi, Syed Farukh Javaid

doi:10.3390/en13143637

Cited by 7 publications

(7 citation statements)

References 28 publications

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“…The result extracted from the numerical model are then compared with the most valid evaporation results by (Chauveau et al 2008). Results obtained in the current numerical model are also close to the results presented in (Abramzon, B. et al, 1989) and also with the earlier work in (Raza, A., Mehboob et al 2020). Results including droplet regression rate and increase in the temperature of droplet are close to the numerical results presented in (Ebrahimian Shiadeh, S. V. et al…”

Section: Model Validationsupporting

confidence: 91%

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Numerical Investigation of Evaporation Modelling for Different Diesel Fuels at High Temperature and Pressure in Diesel Engine

Raza

Miran²,

Islam³

et al. 2022

JER is an international, peer-reviewed journal that publishes f

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Diesel engines are used widely in the world due to their capability of handling high torque and heavy loads efficiently. Fuel injection systems in the diesel engine have different processes that affect the complete burning of fuel in the combustion chamber. These include the primary and secondary breakup of liquid fuel droplets and evaporation. Diesel engines use the air as a working substance only. One of the processes is the evaporation of fuel droplets. Complete evaporation of diesel fuel liquid in the combustion chamber is a prerequisite for complete combustion. Hence evaporation of droplets has an impact on the efficiency of the engine and consequently on the output power and torque. In the present paper evaporation of two different diesel fuels is modeled numerically taking into account the turbulence effects present in the cylinder due to high temperature and pressure using the RANS turbulence model. Evaporation of n-heptane diesel fuel and n-decane is controlled by the numerical model that includes the conservation equations of mass, energy, momentum and species transport. During the evaporation phase heat is transferred to the droplet and due to evaporation from the surface of the droplet, the mass of evaporating droplets is decreased. These two processes are controlled by the equations of the Discrete Phase Model present in the Fluent. Then the results are plotted by varying the droplet diameter and temperature. Results include the decay in droplet diameter, increase in the droplet temperature effect on the velocity of droplet and temperature changes in the cylinder due to evaporation of fuel. There are different parameters which affect the rate of evaporation of fuel droplets inside the engine cylinder of an internal combustion engine. These parameters include the diameter of fuel droplets, initial temperature of fuel droplets, and the temperature inside the cylinder after the compression stroke and surface area of droplets. Small droplets need a short time to evaporate while if the size of droplets is large then evaporation times is also increased.

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Section: Model Validationsupporting

confidence: 91%

“…There are two steps in the DPM calculation. First it solves the continuous phase present in the chamber that is air and then it solves the discrete phase followed by the continuous phase (Raza, A., Mehboob et al 2020). Droplets are injected the in the engine cylinder by creating a discrete phase injection.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Evaporation Modelling for Different Diesel Fuels at High Temperature and Pressure in Diesel Engine

Raza

Miran²,

Islam³

et al. 2022

JER is an international, peer-reviewed journal that publishes f

View full text Add to dashboard Cite

show abstract

“…Evaporation of diesel fuel and biofuel droplets is modeled in [34] using the computational fluid dynamics techniques. In this study, three different ambient temperatures of 623, 823 and 973 K are taken.…”

Section: Resultsmentioning

confidence: 99%

“…Turbulence is also a key part of the evaporation modeling at elevated temperature and pressure conditions. Evaporation of fuel droplets for diesel and biodiesel fuels is numerically modeled and verified in [34][35][36][37] and model was applied in Ansys Fluent. The numerical model equations are given in detail as follows.…”

Section: Modeling Evaporation Of Fuel Dropletsmentioning

confidence: 99%

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Comparison of Evaporation in Conventional Diesel and Bio-Fuel Droplets in Engine Cylinder

Raza¹,

Zunaira-Tu-Zehra²,

Khurram³

et al. 2023

Exergy - New Technologies and Applications

Self Cite

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Renewable energy resources are need of the hour at the current energy scarcity scenario in the world. Scientist and researchers are finding the ways to replace the conventional energy resources with the renewable ones. It is fact that fossils are going to be obsolete in future. One third of global energy is being consumed by the transportation sector. All the amount of this energy comes from the fossils that contain the hydrocarbons in their composition. Efforts are being made to replace the fossils with the renewable energy resources. In this regard, biofuels are emerged as a replacement of the diesel fuels. There are several processes in the engine cylinder from atomization of fuel until the exhaust of gases. One of them is the evaporation of fuel droplets. In the present work, evaporation characteristics of conventional diesel fuel and biofuels is described by comparing them in different working conditions. Modeling of evaporation phenomenon using computational fluid dynamics (CFD) techniques and the effects of in cylinder conditions is also explained. Results show that biofuel droplets show a better evaporation rate at the high operating conditions in the engine cylinder.

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Experimental study on combustion characteristics of a fischer‐tropsch diesel/methanol reactivity controlled compression ignition mode engine

Bai

Wang

et al. 2022

Env Prog and Sustain Energy

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F-T diesel is an alternative fuel with a high cetane number (CN) for internal combustion engines. Methanol has a low CN and contains oxygen. F-T diesel and methanol are potential fuels for the reactivity controlled compression ignition (RCCI) engines.In a single-cylinder 186FA compression-ignition engine with a combination of methanol inlet pipe injection and F-T diesel in-cylinder injection, the combustion characteristics of the F-T diesel/methanol RCCI mode engine are investigated. The results show that as methanol premixed ratio (MPR) increases, the ignition delay (ID) is prolonged at low load conditions, the maximum in-cylinder pressure (P max ) and indicated thermal efficiency (ITE) a decreased. When the MPR increases from 0% to 60%, the ID is extended by 1.7 CA, the P max decreases by 8.1%, and the ITE decreases by 1.1%. At high load conditions, MPR rises from 0% to 60%, combustion duration (CD) is shortened by 2.4 CA, P max is increased by 8.3%, and the ITE is increased by 1.7%.The fuel injection advance angle (IAA) of F-T diesel significantly influences the combustion process of the RCCI engine. As the IAA increases, the ID is shortened at high loads, and the P max and the ITE are increased. When the MPR is 60% and the IAA is 14 CA, the ITE of the engine is increased by 2.04%, and the equivalent indicated fuel consumption rate(b e ) is reduced by 5.68% compared with the engine fueled with F-T diesel under high loads.

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Investigation on the Characteristics of Biodiesel Droplets in the Engine Cylinder

Cited by 7 publications

References 28 publications

Numerical Investigation of Evaporation Modelling for Different Diesel Fuels at High Temperature and Pressure in Diesel Engine

Numerical Investigation of Evaporation Modelling for Different Diesel Fuels at High Temperature and Pressure in Diesel Engine

Comparison of Evaporation in Conventional Diesel and Bio-Fuel Droplets in Engine Cylinder

Experimental study on combustion characteristics of a fischer‐tropsch diesel/methanol reactivity controlled compression ignition mode engine

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