cryogenic rocket engine

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Meaning of Cryogenics


In physics, cryogenics is the study of the production of very low temperature(below −150 °C, −238 °F or 123 K) and the behavior of materials at those temperatures .


Cryogenic technology


Cryogenic technology involves the use of rocket propellants at extremely low temperatures.
The combination of liquid oxygen and liquid hydrogen offers the highest energy efficiency for rocket engines that need to produce large amounts of thrust.
Oxygen remains a liquid only at temperatures below minus 183 ° Celsius and hydrogen at below minus 253 ° Celsius.


History of Cryogenic Technology


The United States was the first country to develop cryogenic rocket engines.
with RL-10 engines, registered its first successful flight in 1963 and is still used on the Atlas V rocket.
Then The Japanese LE-5 engine flew in 1977 ,French HM-7 in 1979 , Chinese YF-73 in 1984 .

The Soviet Union, first country to put a satellite and later a human in space, successfully launched a rocket with a cryogenic engine only in 1987.