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Technical Paper

CFD and Experimental Optimization of Formula SAE Race Car Cooling Air Duct

2013-04-08
2013-01-0799
Engine overheating problems have been the major cause for vehicle breakdown during FSAE endurance runs. Therefore, it is crucial to study the cooling performance, which is affected by the air flow through the side-pod. CFD is used as a tool for this study and simulation based on the complete race car 3D model (NITK Racing 2012 formula student race car - NR XII) is carried out for different cases. Further, Wind Tunnel Experiment is carried out to validate these results. The results obtained for different cases are analyzed to decide the best configuration of the cooling duct. CFD analysis helped in calculating the mass flow rate through the radiator at various velocities. Pressure distribution and velocity distribution were also obtained along the length of the side-pod for different velocities of the car. Area of flow separation and turbulence is visualized and thus smooth airflow into the radiator core area is ensured.
Technical Paper

Performance and Emission Characteristics of a MPI Engine Fueled with Iso-Butanol/Gasoline Blends

2014-04-01
2014-01-1390
A numerical and experimental study on performance and emission characteristics of four-stroke, four-cylinder Multi Point Injection (MPI) engine operating on iso-butanol/gasoline blends was carried out. The study aims at extending the widely used Wiebe function to combustion modeling of alternate fuels. Quasi one-dimensional simulation and experiments were carried out for different blends of iso-butanol and gasoline (0% (pure gasoline), 10% (IB10), 20% (IB20), 30% (IB30), by volume of iso-butanol) at wide open throttle (WOT) condition for five engine speeds in the range of 2000 to 4000 rpm. The computational and experimental results complement each other validating the proposed extension. BSFC of the blends initially drops for IB10 and later rises with increase in concentration of iso-butanol. Compared to gasoline, the blends lead to considerable decrease in the amount of unburned hydrocarbons (HC) and no change of carbon monoxide (CO).
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