ISRO has conducted a successful hot test for the Engine Power Head Test Article (PHTA) as part of its Semicryogenic Engine development program. The test, conducted on March 28, 2025, at ISRO Propulsion Complex in Mahendragiri, Tamil Nadu, is a step toward integrating the 2000 kN thrust semi-cryogenic engine (SE2000) into the LVM3 launch vehicle.
The Liquid Propulsion Systems Centre (LPSC) is developing the semi-cryogenic propulsion engine and stage, which will replace the current L110 core liquid stage of LVM3 to increase payload capacity from 4 metric tons to 5 metric tons in geostationary transfer orbit (GTO). The engine uses liquid oxygen and kerosene as propellants and operates on an oxidizer-rich staged combustion cycle with a chamber pressure of 180 bar.
Key subsystems of the SE2000 engine include the thrust chamber, pre-burner, turbo pump system, control components, and startup system. The test evaluated the integrated performance of critical subsystems such as the pre-burner, turbo pumps, and start system over a duration of 2.5 seconds.
The Semicryogenic Integrated Engine Test facility (SIET) at ISRO Propulsion Research Complex is being used for engine and stage qualification. The facility includes storage and servicing of high-pressure propellants and features a PLC-based control and data acquisition system.
Further tests are planned to validate and refine the engine’s performance before full integration into ISRO’s launch vehicle program. The development involves collaboration with Indian industry for the manufacturing of key components and space-grade kerosene.