ISRO tests indigenous cryogenic engine

The cryogenic engine which will power the upper stage of the GSLV Mk III was fired for a period that is 25 per cent longer than required in a space flight with a nominal thrust of 19 tonnes and its performance matched prediction made through computer simulation, ISRO reported.

The cryogenic C25 stage engine operates on Gas Generator Cycle using extremely low temperature propellants Liquid Hydrogen at 20 Kelvin (-253 degree C) and Liquid Oxygen at 80 Kelvin (-193 degree C), ISRO stated.

“The successful endurance hot test of the first high thrust cryogenic engine is the tenth test in a series planned as part of the development of the engine employing complex cryogenic technology,’’ ISRO said in an official release announcing the successful tests. “Mastering this complex, high-performance cryogenic propulsion technology will go a long way in building self reliance for the Indian space programme,’’ ISRO said.

The cryogenic engine is being developed as part of plans to enhance India’s capabilities in space programmes by providing more power to launch heavier four tonne category spacecraft. Indian capabilites are currently in the two tonne-plus range.

“As part of the C25 stage development, further tests are planned in high altitude conditions and in stage configuration, prior to the flight stage realisation,’’ ISRO said.

In December, ISRO carried out an experimental flight of GSLV Mk III with a dummy C25 cryogenic stage that should in an actual flight provide 50 per cent of the thrust.

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