A REVIEW ON BASE DRAG REDUCTION METHODS.

Abstract

In this project-based learning we are going to know about how the base drag are acting on an object to automobile and aircrafts and it deals with the equations of the drag in fluid dynamics and aerodynamics, and we come to know that what steps are we going to follow how to overcome the drag in vehicles. Reducing base drag of two dimensional and axisymmetric bodies having a blunt base. These methods include splitter plates, both thin and thick, splitter wedges, base bleed. boat-tailing and various types of serrated trailing edges. These methods include splitter plates, both thin and thick, splitter wedges, base bleed, boat-tailing and various types of serrated trailing edges. The effectiveness of the various devices in reducing base drag is shown and compared. In some cases, their influence on the lift of an airfoil is also indicated. Axisymmetric bodies, e.g., missiles, often have a blunt base. The corresponding base drag usually is an appreciable part of the total drag and, if the base drag is not reduced by suitable means, can remarkably reduce the overall performance of the system. Under most circumstances it is desirable to have as small a base drag as possible. Therefore, during the last 25 years many methods for reducing base drag have been developed. Often the periodic lift forces inducing vibrations also decrease if the base drag is reduced. By making CFD analysis also we can predefine the drag on the airfoil and automobile. There are various drag reduction method existing in the present world of transport vehicles and airplane. In general, the dynamics of the system subjected to both internal and external flow concurrently is similar to that with just one of the two flows. It would be of practical importance if it were possible to determine an equivalent flow which would have the same dynamical effect on a given beam as the two flows simultaneously.