Abstract
Compression ignition (CI) engines that run on high-viscosity fuels (HVF) like emulsified biofuels generally demonstrate poor engine performance. An engine with a consistently low performance, in the long run, will have a negative effect on its lifespan. Poor combustion in engines occurs mainly due to the production of less volatile, less flammable, denser, and heavier molecules of HVF during injection. This paper proposes a guide vane design (GVD) to be installed at the intake manifold, which is incorporated with a shallow depth re-entrance combustion chamber (SCC) piston. This minor modification will be advantageous in improving the evaporation, diffusion, and combustion processes in the engine to further enhance its performance. The CAD models of the GVD and SCC piston were designed using SolidWorks 2018 while the flow run analysis of the cold flow CI engine was conducted using ANSYS Fluent Version 15. In this study, five designs of the GVD with varying lengths of the vanes from 0.6D (L) to 3.0D (L) were numerically evaluated. The GVD design with 0.6D (L) demonstrated improved turbulence kinetic energy (TKE) as well as swirl (Rs), tumble (RT), and cross tumble (RCT) ratios in the fuel-injected zone compared to other designs. The suggested improvements in the design would enhance the in-cylinder airflow characteristics and would be able to break up the penetration length of injection to mix in the wider area of the piston-bowl.
Highlights
Diesel engines, otherwise known as the compression ignition (CI) engines are widely used in industrial, commercial transportation, agricultural, watercraft propulsion power, and non-road construction applications, in off-grid situations [1]
This section presents the in-cylinder airflow characteristics concentrating on the start of injection (SOI) between the crank angle (CA) of 346◦ and the start of combustion (SOC) between
The renewable nature and the similarities in the chemical properties the emulsified fuel show that the existing YANMAR L70AE Compression ignition (CI) generator diesel engine can use these of the emulsified fuel show that the existing YANMAR L70AE CI generator diesel engine can use alternative fuels with minor modifications
Summary
Otherwise known as the compression ignition (CI) engines are widely used in industrial, commercial transportation, agricultural, watercraft propulsion power, and non-road construction applications, in off-grid situations [1]. Modern lifestyle and rapid development in urban areas have surged the global demand for fossil fuels to approximately 53%, according to the report of the International Energy Agency [4]. For this reason, the challenges in the new era of the twenty-first century are to resolve the dependency on fossil fuels and to minimize the emission of exhaust pollutants for the sake of human civilization. The commercial production of biofuel has been reported as an economically feasible process, with an added advantage of improved emission characteristics [6]. The problem can be alleviated by enforcing biofuel emulsification, wherein the biofuel burning and thermal inefficiency in the combustion chamber are improved
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