TESTING BLADE SYSTEMS OF FIRST STAGE OF TURBINE UNIT GTE-110 FOR IMPROVING ITS OPERATIONAL RELIABILITY

GTE-110 is the only powerful energy-generating GTU currently manufactured in Russia. With its advanced technical and economic parameters, the unit is well above its foreign analogs in terms of its weight and dimensions. The attractiveness of mass-scale production of unit GTE-110 is significantly hampered due to its insufficiently high operational reliability. A significant part of abnormal operational situations is associated with destruction of rotor blades of the turbine first stage. Analysis of the design of the unit developed by GENPKG «Zorya-Mashproekt» (Ukraine) before the year 2000 performed by JSC «NPO CKTI», has shown that the project has serious deviations from the standards of stationary gas turbine construction. The joint eff orts of JSC «ODK-Saturn», OJSC «NPO CKTI» and LLC «IC «Gas Turbine Technology» have made it possible to optimize the design of the blade system of the turbine fi rst stage. In particular, introduction of a sub-platform damper has improved vibration characteristics of rotor blades. Trimming output edges of the nozzle blades of stage 1 and increasing the axial clearance between the nozzle blades and the rotor blades serves to reducing the value of variable aerodynamic forces exciting the blades. Besides, the trailing edges of rotor blades have been trimmed, and the gaps in their locking connection with the first stage disk, optimized. The cooling system of rotor blades in the first channel area in the root zone trailing edges of the deflector, which enabled to reduce the temperature of the trailing edge of the airfoil. Modernization of cooling systems made it possible to improve thermal stress condition of blade systems of the turbine first stage.

nozzle and working blades of the turbine, hydraulics, temperature, thermal stress and vibration condition

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