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Kaveri

Kaveri Engine is a technologically complex and vital system for the LCA as well as its futurevariants. It incorporates state-of-the-art technologies and provides the required thrust forindigenous competence in this critical area.

With three decades of rich experience in the field of aerogas turbine engines. DRDO has designedand developed the contemporary high performance bypass military engine christened as Kaveri.

Four prototypes of Kaveri engine and two prototypes of Kabini engine (Kaveri core) have beenassembled and are undergoing extensive ground testing. Kaveri engine is a two-spool bypassturbofan engine having three stages of transonic low pressure compressor driven by a single-stagelow pressure turbine. The core engine consists of six-stage transonic compressor driven by single-stage cooled high pressure turbine. The engine is provided with a compact annular combustor withairblast atomisers. The aerothermodynamic and mechanical designs of engine components havebeen evolved using many in-house and commercially developed software for solid and fluidmechanics

Kaveri three-stage transonic fan, designed for good stall margin and bird strike capability, handlesan air mass flow of 78 kg/s and develops a pressure Combustion Chamber Liner ratio of 3.4. Thesix-stage variable capacity transonic compressor of Kaveri develops a pressure ratio of 6.4. Thevariable schedule of inlet guide vanes and two rows of stator is through FADEC control system toopen the stator blades in a predetermined manner. High intensity low UD ratio annular combustorof Kaveri engine incorporates air blast injection of fuel for uniform outlet temperature profile andreduced carbon emission.

Kaveri Engine - The Power Plant for LCA

Kaveri high pressure turbine is provided with an efficient cooling design incorporating augmentedconvection-cum-film cooling for the vanes and combination cooling for the rotor blade to handle upto 1700 K turbine entry temperature. Kabini engine comprising high pressure compressor,combustor and high pressure turbine has undergone high altitude test at facilities abroadsuccessfully demonstrating the flat rating concept of Kaveri engine assembly and in particular thecombustor high altitude ignition and stability performances.

Kaveri engine has been specifically designed for Indian environment. The engine is a variablecycle-flat-rated engine in which the thrust drop due to high ambient, forward speed is wellcompensated by the increased turbine entry temperature at the spool Kabini altitude test speed.This concept has been already demonstrated with high temperature and pressure condition inDRDO's High Mach Facility. Kaveri engine is controlled by Kaveri full authority digital control unit{KADECU), which has been developed and successfully demonstrated at DRDO's test bed.

Kaveri-Special Characteristics

Air-mass flow : 78 kg/s

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By-pass ratio : 0.16

Overall pressure ratio : 21.5

Turbine entry temperature : 1487-1700 K

Maximum dry thrust : 52 kN (5302 kg)

Maximum dry SFC : 0.78 kg/hr/kg

After burner maximum powerthrust

: 81 kN (8260 kg)

After burner maximum powerSFC

: 2.03 kg/hr/kg

Thrust-to-weight ratio : 7.8

Application : Indian LCA