Saturday, January 17, 2009
Friday, January 16, 2009
Thursday, January 15, 2009
The Future Is Now
The Future Is Now
How can a rocket engine that generates 5,000 degree steam and 13,800 pounds of thrust form icicles at the rim of its nozzle? It's cryogenic. The Common Extensible Cryogenic Engine, CECE for short, has completed its third round of intensive testing. This technology development engine is fueled by a mixture of -297 degree Fahrenheit liquid oxygen and -423 Fahrenheit liquid hydrogen.
The engine components are super-cooled to similar low temperatures. As CECE burns its frigid fuels, gas composed of hot steam is produced and propelled out the nozzle creating thrust. The steam is cooled by the cold engine nozzle, condensing and eventually freezing at the nozzle exit to form icicles. Using liquid hydrogen and oxygen in rockets will provide major advantages for landing astronauts on the moon. Hydrogen is very light but enables about 40 percent greater performance (force on the rocket per pound of propellant) than other rocket fuels. Therefore, NASA can use this weight savings to bring a bigger spacecraft with a greater payload to the moon than with the same amount of conventional propellants. CECE is a step forward in NASA's efforts to develop reliable, robust technologies to return to the moon -- and a winter wonder.
Wednesday, January 14, 2009
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