Aerodynamics Class Notes
Aerodynamics is the study of how air interacts with solid objects, like aircraft wings. It plays a huge role in
flight - from lift generation to drag resistance.
1. Basics of Aerodynamics:
Air is a fluid. When an object moves through air, it experiences forces due to pressure and velocity changes.
The main forces are lift, drag, thrust, and weight.
2. Bernoulli's Principle:
This principle explains how pressure decreases when the speed of a fluid increases. That's why air moves
faster over the curved top of a wing, creating lower pressure and generating lift.
3. Types of Flow:
- Laminar Flow: Smooth and orderly, with parallel layers.
- Turbulent Flow: Chaotic and has eddies or swirls.
- Compressible vs. Incompressible: At low speeds, air is treated as incompressible; at high speeds,
compressibility matters (especially near Mach 1).
4. Lift and Drag:
Lift is the upward force keeping the aircraft in the air. Drag is the resistance force opposite to the direction of
motion. The shape of the wing (airfoil) affects both.
5. Angle of Attack:
The angle between the chord line of the wing and the oncoming airflow. More angle means more lift up to a
point-beyond that, the wing stalls.
6. Reynolds Number:
A dimensionless number that helps predict flow type-laminar or turbulent. It depends on velocity,
characteristic length, and viscosity of air.
7. Mach Number:
Aerodynamics is the study of how air interacts with solid objects, like aircraft wings. It plays a huge role in
flight - from lift generation to drag resistance.
1. Basics of Aerodynamics:
Air is a fluid. When an object moves through air, it experiences forces due to pressure and velocity changes.
The main forces are lift, drag, thrust, and weight.
2. Bernoulli's Principle:
This principle explains how pressure decreases when the speed of a fluid increases. That's why air moves
faster over the curved top of a wing, creating lower pressure and generating lift.
3. Types of Flow:
- Laminar Flow: Smooth and orderly, with parallel layers.
- Turbulent Flow: Chaotic and has eddies or swirls.
- Compressible vs. Incompressible: At low speeds, air is treated as incompressible; at high speeds,
compressibility matters (especially near Mach 1).
4. Lift and Drag:
Lift is the upward force keeping the aircraft in the air. Drag is the resistance force opposite to the direction of
motion. The shape of the wing (airfoil) affects both.
5. Angle of Attack:
The angle between the chord line of the wing and the oncoming airflow. More angle means more lift up to a
point-beyond that, the wing stalls.
6. Reynolds Number:
A dimensionless number that helps predict flow type-laminar or turbulent. It depends on velocity,
characteristic length, and viscosity of air.
7. Mach Number:
