ISRO Advances Semicryogenic Engine Development with Successful Hot Test

ISRO has conducted a successful hot test of the Engine Power Head Test Article (PHTA) as part of its semicryogenic engine development program. The test, carried out on March 28, 2025, at the ISRO Propulsion Complex in Mahendragiri, Tamil Nadu, is a key step toward integrating the 2000 kN thrust semicryogenic engine (SE2000) into future launch vehicles.

The semicryogenic propulsion system, developed by the Liquid Propulsion Systems Centre (LPSC), is designed to replace the current L110 core stage of the LVM3 rocket, increasing its payload capacity to geostationary transfer orbit (GTO) from 4 metric tons to 5 metric tons. The SE2000 engine operates using liquid oxygen and kerosene and employs an oxidizer-rich staged combustion cycle, generating a chamber pressure of 180 bar.

The test examined the integrated performance of critical engine components, including the pre-burner, turbo pumps, and start system, over a 2.5-second duration. Additional tests will be conducted to further validate the engine’s design before full-scale integration.

The testing is being conducted at the Semicryogenic Integrated Engine Test facility (SIET) at ISRO Propulsion Research Complex. The facility is equipped for high-pressure propellant storage, servicing, and real-time data acquisition.

ISRO is working with Indian industry partners to manufacture key components and space-grade kerosene for the semicryogenic propulsion system. The ongoing development aims to enhance payload capabilities for future space missions.