Wind tunnel tests have been conducted on a simple bluff body model, representing a car like shape, to investigate drag reduction opportunities from injecting low velocity air into the base region. This flow is known as base bleed. Most tests have been carried out using a square back shape. The effects of flow rate, porosity and porosity distribution over the base area have been investigated. In all cases drag is reduced with increasing bleed rate, but the optimum porosity is a function of bleed rate. A significant part of the drag reduction occurs without the bleed flow and arises from the presence of a cavity in the model. The effects of cavity size are examined for different base configurations. Some factors affecting implementation are considered.
Aerodynamic Drag Reduction for a Simple Bluff Body Using Base Bleed
Sae Technical Papers
SAE 2003 World Congress & Exhibition ; 2003
2003-03-03
Conference paper
English
Aerodynamic drag reduction for a simple bluff body using base bleed
Tema Archive | 2003
|Aerodynamic drag reduction for a simple bluff body using base bleed
Automotive engineering | 2003
|2003-01-0995 Aerodynamic Drag Reduction for a Simple Bluff Body Using Base Bleed
British Library Conference Proceedings | 2003
|WIDE AREA BASE BLEED/INJECTION APPARATUS FOR REDUCING AERODYNAMIC DRAG OF BLUFF BODY VEHICLES
European Patent Office | 2015
|Bluff Body Aerodynamic Drag Reduction by Active Flow Control
British Library Conference Proceedings | 2012
|