ISRO clears major rocket engine test, takes step towards heavier launches

The Indian Space Research Organisation succesfully conducted a hot test of the Semi-Cryogenic Engine Power Head Test Article (PHTA) at a thrust level of 175 tonnes at the ISRO Propulsion Complex (IPRC) in Mahendragiri, Tamil Nadu, on June 24.The test was the eighth in a series of hot tests using the PHTA. The PHTA includes all engine systems except the thrust chamber. Its objectives were to study engine build-up after pre-burner ignition and demonstrate steady-state operation at a higher thrust level.According to ISRO, the PHTA was tested at a thrust level of 175 tonnes, or 88 per cent of its design capacity, for the first time. The test also demonstrated the operation of the main turbopumps, delivering outlet pressures of 400 bar and 500 bar.

Earlier PHTA tests were conducted at thrust levels of 94 tonnes (47 per cent) and 120 tonnes (60 per cent).ISRO said the test proceeded as predicted and all engine parameters were within expected values. The agency said the results provide confidence for demonstrating steady-state performance of the engine powerhead at the full thrust level of 200 tonnes.The Semi-Cryogenic Propulsion Stage (SC120), powered by the 2000 kN-class SE2000 engine, is being developed to replace the existing L110 core stage of the LVM3 launch vehicle.

ISRO said the stage is expected to increase the vehicle's payload capacity and improve operational efficiency.The semi-cryogenic propulsion system uses Liquid Oxygen (LOX) and purified kerosene as propellants. ISRO said the integration of the semi-cryogenic propulsion stage with an uprated cryogenic upper stage is part of its plan to enhance the payload capability of the LVM3 launch vehicle.