angle of attack
Học thuậtThân thiện
Definition
- Noun:
- The acute angle between the direction of the undisturbed relative wind and the chord line of an airfoil (e.g., a wing): This is a fundamental parameter in aerodynamics that describes the orientation of an airfoil relative to the oncoming airflow.
Usage
- The term "angle of attack" is used primarily in aviation, aerospace engineering, and aerodynamics to analyze and control lift.
- It is a critical factor in determining whether an aircraft wing will generate sufficient lift or stall.
- It is typically measured in degrees.
Examples
- Noun:
- The pilot increased the angle of attack to climb.
- A high angle of attack can lead to a stall.
- Engineers carefully calculate the optimal angle of attack for different flight phases.
Advanced Usage
- "Critical angle of attack": The specific angle of attack at which an airfoil stalls, meaning lift decreases dramatically and drag increases.
- Exceeding the critical angle of attack is dangerous.
- "Indicated angle of attack": The angle of attack value shown on a cockpit instrument, as opposed to the actual geometric angle.
- "Angle of attack" is a key concept in discussions about aircraft performance, safety, and design.
Variants and Related Words
- AoA: A common abbreviation for "angle of attack."
- Attack angle: A less common variant with the same meaning.
- Alpha (α): The symbol often used in equations to represent angle of attack.
Synonyms
- Incidence angle: In specific technical contexts, this can be synonymous, though it more precisely refers to the fixed angle between the wing chord line and the aircraft's longitudinal axis.
Related Phrases
- "On the angle of attack": Referring to being at a specific angle.
- The aircraft was flying on a high angle of attack.
- "Angle of attack indicator": A flight instrument that displays the current angle of attack to the pilot.
Noun
- the acute angle between the direction of the undisturbed relative wind and the chord of an airfoil