Feb 08, 2023
Vikas engine has been the workhorse engine for the launch vehicles of ISRO.
The engine with a nominal thrust of 80t is powering the second stages of PSLV &
GSLV, liquid strapons of GSLV and the core liquid stage of LVM3.
Liquid engines that support throttling of the engine thrust
facilitate booster stage recovery in launch vehicles. In order to enable booster
stage recovery in future launch vehicle configurations, the first Throttling
demonstration hot test of the Vikas engine was successfully accomplished on
January 30, 2023 for a targeted 67% thrust level throttling for a duration of 43
Throttling of the engine was achieved by a closed loop thrust
regulation system and the engine had been successfully throttled from the
chamber pressure of 58.5 bar in steps of 50 bar, 45 bar & 40 bar, with dwelling
at each pressure level for 7 s. In addition, the Vikas engine was also throttled
down to 45% for the last 3 s before the engine shut down.
The results of the first hot test of Throttleable Vikas
Engine indicate stable combustion and subsystem performed in accordance with the
prediction. The overall performance of engine sub-systems, control systems &
test facility systems were as expected.