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A steam engine is a heat engine that makes use of the potential energy that exists as pressure in steam, converting it to mechanical work. Steam engines were used in pumps, locomotive trains and steam ships, and were essential to the Industrial Revolution. They are still used for electrical power generation. Steam provides over 90% of the power (mostly for electricity) in the U.S., mainly from steam turbines.A steam engine needs a boiler to boil water to produce steam under pressure. Any heat source can be used, but the most common is a wood or coal fire. Anything that can be burned can be used as fuel for the fire : paper, trash, used crankcase oil, ground-up corncobs, manure, natural gas, gasoline, 200+ proof alchohol, dry grass, hay, dry weeds, etc. The steam expands and pushes against a piston or turbine, whose motion does the work to turn the wheels.
1 Invention
The first steam device, the aeolipile, was invented by Heron of AlexandriaHero (or Heron of Alexandria (c. 70) was a Greek engineer and geometer. His most famous invention was the first documented steam engine, the aeolipile''. He is said to have been a follower of the Atomists. Some of his ideas were derived from the works of, a Greek, in the 1st century1st century BC 1st century 2nd century other centuries) The 1st century was that century which lasted from 1 to 99. Events Beginning of Christianity Spread of the Roman Empire Masoretes adds vowel pointings to the text of the Tanakh Pompeii and Herculaneu AD, but used only as a toy.
Denis PapinDenis Papin ( August 22, 1647 c. 1712), physicist, mathematician, and inventor was born in Blois, Loir-et-Cher, France. A brilliant student of the University at Angers, he became a mathematician and physicist, best known for his pioneering work with steam, a French physicist, built a working model of a steam engine after observing steam escaping from his pressure cookerPressure cooking is a method of cooking food in a sealed vessel that does not permit air or liquids to escape below a preset pressure. Because water's boiling point increases as the pressure increases, the pressure built up inside the cooker allows the li in about 1679Events January 24 King Charles II of England disbands Parliament August 7 The brigantine Le Griffon which was commissioned by Rene Robert Cavelier, Sieur de La Salle, is towed to the southern end of the Niagara River, to become the first ship to sail the. Early industrial steam engines were designed by Thomas SaveryThomas Savery (c. 1650- 1715) was an English inventor, born in Devon at Shilston. Initially interested in naval applications of engineering (he designed an early paddle-wheel), Savery then became interested in pumping machines. On 2 July 1698 he patented ( 1698Events January 4 Palace of Whitehall in London is destroyed by fire. June 19 Volcano of Carguarazon erupts in the Andes and causes a rain of fish August 25 Peter the Great arrives back to Moscow general Gordon has already crushed the streltsy rebellion 34), Thomas Newcomen ( 1712), and James Watt ( 1769), each adding new refinements.
Early engines worked by the vacuum of condensing steam, whereas later types (such as steam locomotives) used the power of expanding steam.
2 Use and Development
The first industrial applications of the vacuum engines were in the pumping of water from deep mineshafts. The Newcomen engine operated by admitting steam to the operating chamber, closing the valve, and then admitting a spray of cold water. The water vapor condenses to a much smaller volumn of water, creating a vacuum in the chamber. Atmospheric pressure, operating on the opposite side of a piston, pushes the piston to the top of the chamber. In mineshaft pumps, the piston was connected to an operating rod that descended the shaft to a pump chamber. The oscillations of the operating rod are transfered to a pump piston that moves the water, through check valves, to the top of the shaft. The first significant improvement was creation of a separate condensing chamber with a valve between the operating chamber and the condensing chamber. This improvement, by James Watt, significantly increased the efficiency of the engine. The next improvement was the replacement of manually operated valves with valves operated by the engine itself. Vacuum (condensing) engines are severely limited in their efficiency but are relatively safe since the steam is at very low pressure and structural failure of the engine will be by inward collapse rather than an outward explosion.
Further improvements in efficiency came with the use of pressurized steam, but with this came much danger and many disasters due to exploding boilers and machinery. The most important refinement at this point was the safety valve, which releases excess pressure. Reliable and safe operation came only with a great deal of experience and codification of construction, operating, and maintenance procedures.
