DRAG REDUCTION FOR A FAST BACK PASSENGER CAR (LOGAN)

Active Drag Reduction of a Simplified Car Model Using a Combination of Steady Actuations

Active drag reduction of an Ahmed model with a slant angle of 25o is experimentally investigated based on a combination of steady blowing over the rear window and behind the vertical base. The Reynolds number Re examined is 0.9 × 10 2.7 × 10. Steady blowing S1 was applied along the upper edge of the rear window, which has been demonstrated to be effective in suppressing the recirculation bubble...

Automatic lateral emergency collision avoidance for a passenger car

A New Approach in Developing Optimal Defrost/Demist Performance in a Passenger Car (TECHNICAL NOTE)

The objective of this paper is to optimize defrost/demist performance in a vehicle. However, to initiate the problem, it is necessary to have a thorough understanding of flow behavior within the compartment. So a full-scale model of passenger compartment has been modeled and the air stream from very near to the windshield up to back of the compartment has been analyzed applying computational fl...

A Review on the Drag Reduction Methods of the Ship Hulls for Improving the Hydrodynamic Performance

Hydrodynamic performance of a marine vessel mainly depends on the frictional and pressure resistance. Pressure drag reduction could be achieved by improving the shape of the vessels with implementation of modern hull forms. Hull forms optimization techniques could also be used for this purpose. Other techniques are needed to deal with the viscous portion of the total resistance, which is mainly...

Modeling and simulation of the acoustic behavior of a muffler in a passenger car exhaust system

Muffler is one of the main components of an automotive exhaust system, which reduces the noise of the exhaust system. In this paper, modeling and simulation of the acoustic behavior of a muffler is presented with the aid of  an engineering software. For this purpose, firstly, an analytical model is presented to evaluate the sound transmission loss in cylindrical shells based on Sander's theory....