Air Resistance or Drag
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Understanding Air Resistance and Drag in Road Vehicles, Slides of Refrigeration and Air Conditioning
The concept of drag in road vehicles, its impact on the car's shape and forward motion, and the role of aerodynamic forces. It discusses how air separation causes drag and reduces the car's speed, and the importance of generating vortices to reduce turbulence and drag.
Typology: Slides
2017/2018
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Air Resistance or Drag
Definition of Drag
- (^) Drag is paralel with ground .It is opposite for vehicle’s forward motion direction. Generally, The biggest aerodynamic force is Drag in road vehicles.For a car ,aerodynamic drag force’s %90 causes shape of car. Aerodynamic drag force compensates with the pulling force provided by the engine. The power to defeat aerodynamic resistance, it constitutes a large part of the engine power.
- (^) If the air separated dramaticly, this leaves a huge hole in air of the car’s wake – a massive low pressure area behind the car
- (^) Now with a high pressure area in front of the car or wing and a low pressure area behind it , this causes a net force to act backwards on the car, dragging it back, reducing its speed You can also think of the low pressure area creating a suction if that’s easier. it’s exactly the same thing if a (maybe) slightly more clumsy way of putting it.