Indian Space Research Organisation Encounters Obstacle In Engine Development Test

Bengaluru(India), 3rd July 2023: The first hot test on an intermediate configuration of the semi-cryogenic engine conducted by the Indian Space Research Organisation (ISRO) was terminated due to an unexpected increase in turbine pressure and subsequent loss of turbine speed. The test, which took place on July 1 at the ISRO Propulsion Complex (IPRC) in Mahendragiri, Tamil Nadu, aimed to develop a 2,000 kN thrust semi-cryogenic engine for future launch vehicles’ booster stages, according to a statement released by the national space agency headquartered in Bengaluru.

The purpose of the test was to validate the integrated performance of critical subsystems such as the gas generator, turbo pumps, pre-burner, and control components through a short-duration hot-firing of 4.5 seconds. The focus was on igniting and generating hot gas within the pre-burner chamber to drive the main turbine, which powers the fuel and oxidizer pumps.

However, at 2.0 seconds, an unforeseen surge in turbine pressure occurred, resulting in a loss of turbine speed. As a precautionary measure, the test was terminated. Further analysis is underway to gain a better understanding before proceeding with longer-duration hot tests.

The semi-cryogenic engine incorporates a propellant blend of liquid oxygen and kerosene. The PHTA denotes the inaugural hardware trial within the engine development initiative. The dedicated test facility at IPRC, established specifically for testing semi-cryogenic engines and stages, was utilized for this test.

ISRO initiated the PHTA testing in May at the newly established facility.