Journal of Thermodynamics & Catalysis
Open Access

Development of Diesel Engines by using Fluid Dynamics Technology

Chuan Chieh^{* *}Correspondence: Chuan Chieh, Department of Aerodynamics and Fluid Mechanics Engineering, National Taiwan University (NTU), Taipei, Taiwan, Email:

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Description

One of the hardest fluid dynamics modeling challenges is the fluid flow in an internal combustion engine. This is effective because there are significant density changes in the flow. So, in order to enhance performance and reduced emissions without sacrificing fuel economy, a detailed analysis of the flow and combustion processes is necessary. The simulation used in this study modelled a DI diesel engine with a bowl-in-piston for a better understanding of the motion of gases inside the engine's cylinders and to provide information on the combustion process that is crucial for assessing the effects of consuming synthetic atmosphere on engine performance. In order to design a non-air recycling diesel with exhaust management system, this is required [1]. Computational Fluid Dynamics was used to run a simulation (CFD). There is adequate range in the turbulence and combustion models to account for spray production, delay time, chemical kinetics, and on set of ignition. Present results from the modelling and experimental data had good agreement [2].

The model was extremely helpful in determining the specifics of the in-cylinder flow patterns, combustion process, and combustion species throughout the engine cycle. The outcomes demonstrate a 6% over prediction of the greatest pressure peak by the model. Other engine parameters represented by the simulation are shown, including engine emissions, fuel mass fraction, indicated gross work, ignition delay time, and heat release rate [3].

The automotive sector places a high emphasis on reducing CO₂ emissions and using fossil fuels more effectively. It would not be able to successfully achieve fuel consumption and CO₂ emission reduction targets without increasing contributions from diesel engines and newer diesel technology [4]. In order to solve the issues with exhaust gas emission, new regulations and applications have been implemented. Soot and NO_x are two exhaust gases that have gained popularity due to their potent impacts. The ozone layer suffers as a result of acid rain, which NO_x helps to produce. Using Computational Fluid Dynamics, this study examines the flow and combustion characteristics of a diesel engine (CFD) [5].

Use of fluid dynamics in automobiles

A car's fluid system is an essential component. Only after there is a fluid press maybe the car starts. Typically, gasoline, diesel, or another roil is used as fluid in autos. This substance in a car is referred to as fuel. Fuel has three main purposes: it lubricates moving parts of machines, produces power, and cools heated engines for a variety of purposes. Water is utilized as a cooling fluid in vehicles such as vehicles and other massive engines.

Conclusion

In this operation, a diesel engine running at a constant speed was converted into a dual-fueled diesel engine. NG served as the engine's base fuel, while diesel was used as the engine's pilot fuel. Performance and emissions were tested experimentally under a range of loads and PGF ratios, including 10, 25, 50, 75, and 100% of the whole load. The dual-fueled mode, compared to diesel mode, showed lower CO₂, NO_x, and PM emissions under all load circumstances and PGF ratios, according to the data, while the engine was running at a constant speed with varying loads. The dual-fueled engine produced more HC and significantly less CO when fully loaded. The specific energy consumption of the dual-fueled engine was identical to that of the diesel engine when operating at full capacity. It is advised to run an engine in dual mode at 30 and 50% of the pilot fuel ratio at full and half loads, respectively, to reduce pollutants and improve fuel efficiency. The estimation of simulations of cylinder pressure and emissions in the dual mode could be made possible by modifying it.

References

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