The Optimization Of Pressure Different Rear Suction Airflow Correction Device Based On The Ratio Inlet Over Outlet In Motivation Of Aerodynamic Drag Reduction

Mohd Jailani, Muhammad Aiman Afiq (2016) The Optimization Of Pressure Different Rear Suction Airflow Correction Device Based On The Ratio Inlet Over Outlet In Motivation Of Aerodynamic Drag Reduction. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) The Optimization Of Pressure Different Rear Suction Airflow Correction Device Based On The Ratio Inlet Over Outlet In Motivation Of Aerodynamic Drag Reduction.pdf - Submitted Version Download (618kB)

Abstract

One of the most significant part in aerodynamic of vehicle is drag reduction. Pressure drag contribute up to 80% of the total drag and it is related directly to geometry shape of vehicle. Drag that created by pressure different at the front and rear of vehicle are the major issue in all segment of vehicle including bluff body segment as this segment consume large number of fuel. Suction the airflow at the rear of the vehicle can reduce the wake region where the pressure at the region is increased. Venturi effect is proposed from Bernoulli principle. The small opening at the inlet yield high velocity low pressure and at the outlet yield low velocity high pressure. The suction into the inlet reduce the wake region behind the model while at the outlet the air is blow out from the venturi shape causing air pressure to increase at the wake region. The objective of this study to apply the venturi shape at the rear of the body that can change the pressure different and reduce drag coefficient (Cd) of bluff body which in this case use modified Ahmed body. The design and simulation of the model will be aided by using Computer-aided Design (CAD) and computational fluid dynamic (CFD) software. Then, the fuel consumption also calculated in order to find out the percentage difference that can be get by implementing this design to bluff body and can change the trend on designing the bluff body in the real world.

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