Numerical Studies on Controlling Gaseous Fuel Combustion by Managing the Combustion Process of Diesel Pilot Dose in a Dual-Fuel Engine

Abstract

Protection of the environment and counteracting global warming require finding alternative sources of energy. One of the methods of generating energy from environmentally friendly sources is increasing the share of gaseous fuels in the total energy balance. The use of these fuels in compression-ignition (CI) engines is difficult due to their relatively high autoignition temperature. One solution for using these fuels in CI engines is operating in a dualfuel mode, where the air and gas mixture is ignited with a liquid fuel dose. In this method, a series of relatively complex chemical processes occur in the engine's combustion chamber, related to the combustion of individual fuel fractions that interact with one another. Analysis of combustion of specific fuels in this type of fuel injection to the engine is difficult due to the fact that combustion of both fuel fractions takes place simultaneously. Simulation experiments can be used to analyse the impact of diesel fuel combustion on gaseous fuel combustion. In this paper, we discuss the results of simulation tests of combustion, based on the proprietary multiphase model of a dual-fuel engine. The results obtained from the simulation allow for analysis of the combustion process of individual fuels separately, which expands the knowledge obtained from experimental tests on the engine.

Impact of Biogas and Waste Fats Methyl Esters on NO, NO2, CO, and PM Emission by Dual Fuel Diesel Engine

“…Because of this, the research tilts biogas (BG) compression ignition engines [42]. The pilot dose is diesel fuel (DF) and the main fuel is biogas [42,43]. It was found that the proportion of BG in fuel has a positive effect on the level of harmful gas emissions but slightly lowers the efficiency of the engine at full load [44][45][46][47][48].…”

“…Because the biogas obtained in practice is characterized by the variable content of methane, carbon dioxide, and hydrogen sulphide, research is conducted in which the gas composition is simulated in order to discover phenomena and dependences having a significant impact on toxic exhaust components [55][56][57][58]. However, after analyzing the literature [42,43,59,60], one cannot get an unambiguous answer to the question of whether the solution is pro-ecological.…”

Validation of a zero-dimensional and 2-phase combustion model for dual-fuel compression ignition engine simulation

“…5. Achieved accuracy vs. computation efficiency allow to conclude that the model is capable of supporting major phases of DF combustion engine development, i. e.: concept study support (some trend prediction capabilities using the model had already been shown in [27]), control development (the model can anticipate system reaction on air-path and injection system excitations and therefore support designing control strategies, also transients prediction is possible when combine with a proper air-path model) and model-assisted calibration (the model accuracy allows for pre-determining controller parameters which can serve as basis for experimental fine-tuning calibration). For model based control the model is still to slow for direct implementation.…”

“…While injecting the liquid fuel the thermodynamic parameters of the medium are changed. The effect of the mass stream of the fuel injected into the cylinder was modelled with the aid of the Mikulski et al [27] original correlation based on a normal distribution.…”

“…The model was then fine-tuned using this parameter until reaching the minimum of the averaged model fit error. The tuning strategy took to account the results of earlier experimental research [27] concluding that the presence of gaseous fuel causes prolongation of diesel combustion duration. The optimised ∆α MD was therefore searched within the boundaries of +20 CA from the basis value.…”