Dry Kavery Engine to be ready by 2024 | Will power Ghatak and FUFA Unmanned Aerial Vehicle

Dry Kaveri: A success story

GTRE's Kaveri effort may have failed to yield a usable fighter-class low-bypass afterburning turbofan but its core is being developed further and is quite stable usable and the learnings have been significant. In my opinion GTRE has been successful in developing the core of the engine or we can say engine without after burner. We must appreciate the efforts despite the delays and limited budget for the program. This will be steppingstone for India’s futuristic engine development program of 110kN or higher thrust engines. In today’s video we are going to discuss in detail about the dry Kaveri engine and DRDO’s plan for the future development and application of the engine.

Kaveri Derivative power plant

The dry engine is the Kaveri Derivative power plant for Indian Unmanned Aerial Vehicle like Ghatak and FUFA. It is an non-afterburning turbofan engine. The engine is based on the Kaveri engine architecture with specific indigenous modules such as high inlet distortion tolerant fan, indigenous engine fuel control system and Autonomous FADEC and modified jet pipe.

The dry Kaveri can generate dry thrust of 46kN, weighs around 1180kg with SFC of 0.824 kg/hr/kgf. SFC is the quantity of fuel burned in unit time required to produce a given engine output. For dry Kaveri it means it can consume 0.824kg of fuel per hour to produce the rated or desired thrust, which is quite efficient for its category.

Issues with Kaveri Engine fixed

In past we have herd of various issues related to Kaveri engine. This is not an indicator of project failure but part of development of any engine program. As per latest updates, the problems of Kaveri engine have been solved and only high-altitude tests are remaining. One of the major issues with the Kaveri engine was the flutter of fan blades. Flutter was related to all the blades used in the engine. Various methods have been deployed to successfully resolve the flutter issue. Other issues with Kaveri engine related to fan, HP Compressor, LP Turbine, combustor, after burner and screech issue has also been resolved.

Future plan of GTRE

If we talk about the present status of the engine, the technology demonstrator engine has been realized and performance and operability of engine at GTRE had been successfully demonstrated. GTRE has planned the Performance and operability across the flight envelop in altitude test facility in 2022. The initial flight release (IFR) certification of the engine is planned to be completed by 2024.

India’s dependence on Russian Test Bed

One of the major challenges with the engine development is High Altitude test facility, flying test bed, Environmental test facilities and full-scale module test facilities. At present DRDO does not have a facility for stimulation of an engine that will work at 40,000 to 50,000 feet above ground. The engine had undergone testing in Russia on many occasions over the years.

GTRE is ready with the engine and its eagerly waiting for simulated high altitude tests. Designers working on the Kaveri Dry engine explained that simulated tests basically simulate high altitude conditions on the ground. Once the Kaveri Dry engine clears these simulated high-altitude tests, GTRE will position the engine in the flying test bed (FTB), which is a modified Ilyushin (Il)-76 fixed-wing, four-engine turbofan aircraft. The Kaveri Dry engine will replace one of the Il-76's four engines in the FTB. However, India’s dependence on Russia for conducting simulated high-altitude tests and flight test bed testing are causing a further delay to the flight-testing of the Kaveri dry engine.

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