Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

Mechanical Engineering: Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

The document Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering is a part of the Mechanical Engineering Course Mechanical Engineering SSC JE (Technical).
All you need of Mechanical Engineering at this link: Mechanical Engineering

DRAG AND LIFT

  • The component of the force parallel to the direction of flow is called the drag & normal component is called the lift. 
  • Friction drag - when flow occurs past a flat surface at zero incidence, the fluid exerts a drag-force on the surface known as friction drag which is in downstream direction. 
  • Pressure drag - when flow occurs past a surface which is not everywhere parallel to the fluid stream a drag force results on account of difference of pressure over the body surface, known as pressure drag. 
  • Stream lined body has friction drag only whereas Bluff body has pressure drag only 
  • Total drag on the sphere is about one-third of the drag for the disc. 
  • Coefficient of drag and lift

Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering
Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

 Flow at very small Reynolds number is known as the creeping motion  Boundary Layer Parameters in Laminar Conditions

Boundary Layer thickness (d) =
Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

Displacement thickness (d*) =
Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

Momentum thickness (q) =
Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

Local friction drag coefficient Cd* =
Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

Average friction drag coefficient Cd =
 

Shear stress to =
Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

 

  •  Boundary Layer Parameters in Turbulent Conditions

Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering
Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

  • The drag which depends upon profile and orientation of the airfoil, known as profile drag, whereas drag which depends upon the airfoil plan form & is induced by the lift force is known as induced force. 
  • The phenomenon of lift produced by imposing circulation over a uniform fluid steam is known as Magnus effect.
The document Drag & Lift Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering is a part of the Mechanical Engineering Course Mechanical Engineering SSC JE (Technical).
All you need of Mechanical Engineering at this link: Mechanical Engineering

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