This lesson covers the principles of delta wing aerodynamics and unsteady aerodynamics. It delves into the mechanisms of how a delta wing sustains lift at high angles of attack, the impact of flow separation and reattachment, and the role of primary and secondary vortex structures. The lesson also explores the concept of unsteady aerodynamics, where flow properties vary with time, leading to phenomena like wing stall, vortex breakdown, and dynamic stall. Examples from nature and man-made flyers like micro air vehicles are used to illustrate these concepts.
01:39 - Explanation of the circulation distribution at different angles of attack for a delta wing.
07:32 - Explanation of the lift coefficient curve for a delta wing and the concept of vortex breakdown.
10:28 - Introduction to unsteady aerodynamics and explanation of its occurrence.
15:15 - Discussion on the effects of unsteady aerodynamics on airfoil and finite wing sections.
22:38 - Discussion on the effects of cyclic heaving and pitching on the aerodynamics of an airfoil.
27:47 - Explanation of the occurrence of unsteady movements in larger aircrafts due to fluid flow.
- Delta wings can sustain lift at high angles of attack due to the formation of primary and secondary vortex structures.
- Flow separation and reattachment on the upper surface of the delta wing create suction peaks, contributing to lift.
- Unsteady aerodynamics occur when flow properties vary with time, leading to phenomena like wing stall and vortex breakdown.
- In man-made flyers and natural flyers like birds and insects, unsteady aerodynamics are used to generate substantial lift and perform maneuvers.
- Unintended and detrimental unsteady effects can occur in larger aircrafts, leading to phenomena like wing flutter and divergence.