Introduction to R & P

Resistance and Propulsion of Ships 4011

Lecture 3

Introduction to R & P

! Appendages n  bilge keels, rudders, shafts & shaft brackets

! Resistance

Resistance and Propulsion of Ships

Introduction to R & P

! Resistance

Resistance and Propulsion of Ships

! Appendages n  shafts & shaft brackets, bossings

Introduction to R & P

! Resistance

Resistance and Propulsion of Ships

! Appendages n  Stabilizing fins, sacrificial anodes

Introduction to R & P

! Components of resistance ! Resistance

Resistance and Propulsion of Ships

Introduction to R & P

! Pop quiz: Components of resistance

n  Sketch a plot of resistance coefficient CR –vs- Froude number Fn for the following cases? w  Case 1: Deeply submerged submarine in a perfect

fluid, moving at constant velocity.

! Resistance

Resistance and Propulsion of Ships

Introduction to R & P

! Pop quiz: Components of resistance

n  Sketch a plot of resistance coefficient CR –vs- Froude number Fn for the following cases? w  Case 1: Deeply submerged submarine in a perfect

fluid, moving at constant velocity. w  Case 2: Displacement ship in an inviscid fluid, moving

at constant velocity at the free surface.

! Resistance

Resistance and Propulsion of Ships

Introduction to R & P

! Pop quiz: Components of resistance

n  Sketch a plot of resistance coefficient CR –vs- Froude number Fn for the following cases? w  Case 1: Deeply submerged submarine in a perfect

fluid, moving at constant velocity. w  Case 2: Displacement ship in an inviscid fluid, moving

at constant velocity at the free surface. w  Case 3: Deeply submerged submarine in a real fluid,

moving at constant velocity.

! Resistance

Resistance and Propulsion of Ships

Introduction to R & P

! Pop quiz: Components of resistance

n  Sketch a plot of resistance coefficient CR –vs- Froude number Fn for the following cases? w  Case 1: Deeply submerged submarine in a perfect

fluid, moving at constant velocity. w  Case 2: Displacement ship in an inviscid fluid, moving

at constant velocity at the free surface. w  Case 3: Deeply submerged submarine in a real fluid,

moving at constant velocity. w  Case 4: Displacement ship, deeply submerged,

moving at zero speed in a real fluid.

! Resistance

Resistance and Propulsion of Ships

Introduction to R & P

! …next class…

n  Dimensional analysis applied to ship resistance

! Resistance

Resistance and Propulsion of Ships