Numerical Study on Low Speed Electric Car for Public Transportation to Predict its Aerodynamic Performance and Stability
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Energy efficiency and dynamic stability of Battery Electric Vehicle (BEV) is highly influenced by size of powertrain, aerodynamic characteristics and driving conditions. The main idea of this work was to study aerodynamic performance of BEV sized based on Ethiopian driving profile and BAJAJ QUTE chassis platform. Numerical analysis was conducted to reveal various surface features and side wind velocities influence using coefficients of aerodynamic forces and moments, vector and contour plots of CFD (Computational Fluid Dynamics). From the analysis, it was found that average aerodynamic coefficients and moments with side wind are much higher than simulated values of original car with corresponding values of CD (3.11), CL (0.45), YM (-240.52Nm) and RM (-363.84Nm). The power requirement to overcome aerodynamic road load with 10m/sec side wind has increased (13.36kW) by 3.3 times as compared to no wind effect power of (4.05kW). The car moving through a straight level road found to be stable at any side-wind below 15m/sec, but it could reach to unstable condition in curved road. For car moving in any road under side-wind greater than 15m/s, there is a chance of turnover and breakaway of a lane.
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