Chapter 6.2 Notes Fluid Power Fluid Power. Fluids do work when they move objects. Fluid Power = (Pressure x volume) / time Pwr = (PV)/t.

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Presentation transcript:

Chapter 6.2 Notes Fluid Power Fluid Power

Fluids do work when they move objects. Fluid Power = (Pressure x volume) / time Pwr = (PV)/t

A tank has a volume of 2 ft 3 and the pressure is 14 lbs/ft 2. What is the power needed to fill the tank in 2 seconds? Pwr = (PV)/t Pwr = (14 lb/ft 2 x 2 ft 3 ) / 2 s Pwr = 28 / 2 Pwr = 14 ft·lb/s

For problems knowing speed, to find the power of a fluid use equation – Power = ∆Pressure x pi x radius 2 x Velocity Pwr = ∆P∏r 2 v

If the diameter of a pipe is 2 meters, the speed of the fuel in the pipe is 4 m/s and the pressure changes from 150 kPa to 250 kPa, what is the power? Pwr = ∆P∏r 2 v Radius = diameter /2 = 2 /2 = 1 Pwr = ( )x 3.14 x 1 x 4 Pwr=100N/m 2 x3.14x1m 2 x4m/s Pwr = 1256 Nm/s or Watt

A hydraulic system uses water to convert fluid power into mechanical power. A pneumatic system uses gas to convert fluid power into mechanical power.

A pump increases the pressure of the fluid. The pressure causes the piston to move.

Internal combustion engines burn gasoline or fuel to power cars and trucks.

In gas turbines, hot gases from burning fuel pass through sets of blades to turn the blades; used in airplanes and ships.

Rocket motors burn fuel and push the hot gases through nozzles - to provide lifting power.

The heat of combustion of a fuel is the amount of heat released when one kilogram of fuel is completely burned.