The turboprop engine TV7-117ST-01 has received the type certificate

Photo by © United Engine Corporation (UEC)

Federal Air Transport Agency (Rosaviatsiya) has issued ODK-Klimov JSC with a Type Certificate for the TV7-117ST-01 engine. Obtaining a type certificate by the engine developer is an important step in the ongoing certification of the IL-114-300 aircraft, the agency’s press service said.

“The TV7-117ST-01 engine is an aviation turboprop engine with a free turbine, designed for use as part of the power plant of the IL-114-300 aircraft. It is based on the engine TV7-117S/SM, equipped with a modernized digital control unit BARK-65SM and adapted for the propeller AV112-114 development of NPP Aerosila, which is also undergoing certification, “- said in the message Rosaviatsiya.

Turboprop engines are divided into twin-shaft or free turbine and single-shaft. In the first case there is no mechanical connection between the gas generator and the transmission, the drive between the compressor turbine and the free turbine is only gas-dynamic. From the free turbine there is a separate shaft, which transmits the torque to the propeller through a reducer. In the second case, the turbine with the compressor and the propeller are on the same shaft.

The use of a free turbine has several advantages, including the possibility of operating the power unit of the aircraft on the ground as an auxiliary power unit – without the rotation of the propeller, with the working gas generator provides the aircraft with electricity and high pressure air for on-board systems.

The application of the axial centrifugal compressor, which combines the aerodynamic advantages of axial stages with high efficiency and centrifugal stages expanding the range of stable operation, is the best solution for small gas turbine engines with high thermodynamic cycle parameters. The annular counterflow combustion chamber, which is located around the turbine assembly, allowed to reduce the engine length, obtain good emission characteristics and low smoke level.

In the TV7-117 engine family, the turbine assembly is the result of compromises caused, in particular, by the small size of the turbine blades. The working blade of the first stage of the TV7-117 turbine is slightly larger than a thumbnail. Rotating at an enormous speed, such a part has to work for thousands of hours at the ambient gas temperature of one thousand and a half degrees. The corresponding technologies for manufacturing such parts have been developed by the engineers of ODK-Klimov together with the scientists of the Central Institute of Aviation Machine Building named after Baranov. Baranov Central Institute of Aviation Engineering and All-Russian Scientific Research Institute of Aviation Materials.

A digital twin has been created for the engine TV7-117ST-01 – the first and so far the only example in the industry of a comprehensive approach to complete formalization of the gas-turbine engine design process with a detailed description of all controlled parameters and target values and interconnection of all calculation models created during product design. The CD is a virtual model integrated into the production. It will store and reflect detailed information about the creation, existing parameters and operation of each manufactured engine. The system will enable virtual testing, propulsion system behavior prediction, and determination of which engine elements are more expedient to produce using additive technologies.

Upgraded power plant for IL-114-300 includes turboprop engine TV7-117ST-01, air propeller AV-112-114 with propeller regulator PSV-34S-114, automatic control system of FADEC type BARK-65STM and fuel system units. ODK-Klimov is planning to carry out certification activities in order to expand the engine performance as well as to certify a TV7-117ST-02 engine modification for use in the TVRS-44 Ladoga aircraft propulsion system.