What Is a Cryogenic Engine?

Low temperature engine technology refers to the use of liquid hydrogen and liquid oxygen as a mixed fuel for rockets. The fuel temperature of low temperature rocket engines is minus 250 degrees.

Low temperature engine

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Cryogenic engine technology means

Launch vehicles usually use liquid fuel, have large thrust and are easy to adjust. This liquid fuel includes fuel and oxidant. Useful liquids at room temperature, such as the combination of nitrous oxide and unsymmetrical dimethylhydrazine used in China's Long March series. Easy to operate at room temperature, but more toxic.

There are also low-temperature liquids, such as liquid oxygen-liquid hydrogen combinations. The advantage is that it is very clean and environmentally friendly, but the preservation, filling of the low-temperature liquid and the impact on the mechanical part are not easy to solve. But this is the mainstream development direction in the future, and our Long March 5 will also use it.

This latter type of liquid rocket engine using low temperature fuel and oxidant is called low temperature engine. The boiling point of liquid oxygen is minus 183 degrees Celsius, and liquid hydrogen should be stored at minus 253 degrees.

India's low-temperature engine was first pointed out by Satish, and Indian astronauts will take the improved launch vehicle GSLV-Mark-2 into space. It is said that the GSLV-Mark-2 launch vehicle will use low-temperature engine technology, while the Mark-1 generally uses rocket engines provided by Russia. According to the plan, the GSLV-Mark-2 launch vehicle will undergo its first launch test in 2012.