engines and motors part - 2. engines and motors turbines rocket steam
TRANSCRIPT
Engines and Motors
Part - 2
Engines and Motors
Turbines Rocket Steam
Turbine Engines
In all cases, something (a force) spins the turbine.
Background Steam Water Wind
Gas Turbine / Jet Engines
In a gas turbine a pressurized gas spins the turbine.
Gas Turbine / Jet Engines
The engine produces its own pressurized gas, and it does this by burning something like propane, natural gas, kerosene or jet fuel.
The heat that comes from burning the fuel rapidly expands the exhaust gasses, and the high-speed rush of this hot air spins the turbine.
Helicopter Engine
Gas Turbine / Jet Engines
Advantages: Excellent Power to Weight Ratio Small Size
Disadvantages: EXPENSIVE! Prefer a constant load
External Combustion Engines
Steam Engines Rocket Engines
Steam Engines
Steam engines were the first engine type to see widespread use.
Thomas Newcomen in 1705
Used to pump water from coal mines along sea shore
Steam Engines
Steam engines powered all early locomotives, steam boats and factories, and therefore acted as the foundation of the industrial revolution.
Steam Engines
Rocket Engines
Rocket engines are reaction engines. The "strength" of a rocket engine is
called its thrust. Thrust is measured in "pounds of thrust"
Rocket Engines – 2 Types
Solid Fuel Liquid Fuel
Rocket Engines-Solid Fuel
Solid-fuel rocket - first engines created by man.
Invented in China around 1232
Rocket Engines – Solid Fuel
Solid-fuel rocket engines have three important advantages: Simplicity Low Cost Safety
They also have two disadvantages: Thrust cannot be controlled Once ignited, the engine cannot be
stopped or restarted
Rocket Engines-Liquid Propellant Rockets
Robert Goddard-1926 He also worked on and
solved a number of fundamental problems in rocket engine design, including pumping mechanisms, cooling strategies and steering arrangements.
Rocket Engines-Liquid Propellant Rockets
Advantages: Shut
Down/Restart Can “Throttle” Higher
Performance
Disadvantages: Very Complex Very Expensive
Electric Motors
1st practical electric motors from Emily and Thomas Davenport in 1837
Ran @ 600 RMP, and powered machine tools and a printing press
Electric Motors
Electric Motors: D/C A/C
Electric Motors
Electric Motors
Electric Motor in Action
Hybrids
Any vehicle is hybrid when it combines two or more sources of power.
Examples: mo-ped, car, locomotive, sail boat
Hybrids
Hybrid Cars Electric Drag Racing
The End