coefficient of drag
Học thuậtThân thiện
Definition
- Noun:
- A dimensionless number representing aerodynamic resistance: The coefficient of drag is a numerical value that quantifies the aerodynamic drag or resistance of an object moving through a fluid, such as air. It is defined as the ratio of the drag force on the body to the product of the fluid's dynamic pressure and the body's reference area.
Usage
- The term is used primarily in physics, engineering, and automotive design to describe and compare the aerodynamic efficiency of shapes.
- It is a key parameter in calculating the total drag force on an object.
- It is often abbreviated as Cd.
- Example:
Examples
- Noun:
- A streamlined shape typically has a low coefficient of drag.
- Engineers calculated the coefficient of drag for the new aircraft wing design.
- The vehicle's high coefficient of drag meant it consumed more energy at highway speeds.
Advanced Usage
- "Cd value": A common way to refer to the specific numerical coefficient.
- The prototype achieved a remarkable Cd value of 0.21.
- "Drag coefficient": This is a fully synonymous term and is often used interchangeably with "coefficient of drag."
- The drag coefficient is crucial for performance simulations.
Variants and Related Words
- Drag coefficient (n): A direct synonym for coefficient of drag.
- Cd (n): The standard abbreviation.
- Aerodynamic coefficient (n): A broader category of coefficients that includes the coefficient of drag.
Synonyms
- Drag coefficient: The most common direct synonym.
- Air resistance coefficient: A more descriptive synonym emphasizing resistance to air.
Related Phrases
- Coefficient of lift: A related aerodynamic coefficient that quantifies lift force.
- Reynolds number: A different dimensionless number in fluid dynamics that affects the coefficient of drag.
Noun
- the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body