Simulation of Dual-Fuel Diesel Combustion With Multi-Zone Fuel Spray Combustion Model

Abstract

There is increasing interest in application of various alternative fuels in marine diesel engines, including methanol. One of the challenges in the relevant research is the development of computer codes for simulation of the dual-fuel working process and engineering optimization of engines. In this work the mathematical model is described which simulates a mixture formation and combustion in an engine with a dual-fuel system, in which methanol is used as main fuel and a pilot portion of diesel oil is injected to ignite methanol. The developed combustion model was incorporated into the existing engine full cycle thermodynamic simulation tool, namely DIESEL-RK [1]. The developed combustion model includes the self-ignition delay calculation sub-model based on the detail chemistry simulation of methanol pre-combustion reactions, sub-model of evaporation of methanol droplets, submodels of methanol fuel sprays penetration, spray angle and droplets forming, respectively. The developed computer code allows engineers to account for the arbitrary shape of the combustion chamber. Additionally, each fuel system (for methanol and diesel oil) may include several injectors with arbitrary oriented nozzles with different diameters and central, off-central and side location in the combustion chamber. The fuel sprays evolution model consists of equations with dimensionless parameters to account for fuel properties and in-cylinder conditions. Specifics of injection pressure profiles and interaction of sprays with the air swirl and between themselves are also considered. The model allows engineers to carry out rapid parametric analysis. Results of modelling for a medium speed dual-fuel diesel engine are presented which demonstrate a good agreement between calculated and experimental heat release curves and integral engine data.

Analysis and Multi-Parametric Optimisation of the Performance and Exhaust Gas Emissions of a Heavy-Duty Diesel Engine Operating on Miller Cycle

“…The software has the capability of simulating and optimizing the operation method of 2-stroke and 4-stroke internal combustion engines, including all the types of boosted engines. Another feature of the program is the simulation of the MC, as it can be applied to a CDE by changing some variables such as IVC degrees and PR c [19][20][21]. The package also includes the following features which were used in this study:…”

An experimental and simulation study of performance and emission of ethanol fueled direct injection in high compression ignition engine

“…(a) shows that single injection velocity Vs crank angle profile, it is clearly indicated that the injection velocity reaches maximum after start of injection 4 deg and duration of injection is 27 deg. (b) shows that split injection profile; it is shown that injection is split in to three injections with crank angle . Injection velocity reaches at maximum after start of injection 3 deg and duration of injection split in to three injections.…”

“…This enhancement represents a significant advance in lubrication containing vegetable oil and minimizes the risk of thickening or lacquer formation. Lubrication oil is fully soluble in alcohol fuels and ideally suited for use in both air and liquid cooled engines running on methanol and ethanol fuel . Ethanol Fuel properties are shown in Table .…”

“…Diesel RK software is used for combustion simulation of multi‐fuels like ethanol fuel. Thermodynamic, it is used to simulate performance and emissions of diesel and ethanol fuel at various load conditions . This software is intended for calculation and optimization of various compression ratios, various load conditions, various injection pressures, and fuel injection angles.…”

“…The maximum cylinder peak pressure 142 bar was attained at after TDC 11 0 . Pressure Vs crank angle diagram was used to predict and optimized injection angle . Pressure Vs Crank angle experimental (ethanol fuel single Injection angle of injection BTDC‐15 deg ‐rpm 1500.…”