How radial clearance affects gas turbine plant parameter ratios
Accuracy in determining performance characteristics of gas turbine plants depends more than anything else on the stability of the geometric and thermodynamic variables over the engine flow passages in different operating modes. Results of theoretical investigations have shown that changes in the radial clearances (brought about in turn by changes in the thermal stress state of turbine parts) have a lot to say in divergences of engine characteristics. The authors carried out studies on a GTT-12 model equipment in order to find experimental verification for the procedure followed in calculating radial clearances in response to changes in the operating conditions of the turbine plant. Radial clearances in the high-pressure turbine (TVD) were calculated for different sets of operating conditions, starting from the instant of startup cold till the machine took on full load. Then experimental investigations were staged with the test bed of the Khabarovsk power machinery factory (KhZEM) to measure radial clearances under operating conditions corresponding to calculations.
- OSTI ID:
- 5149469
- Journal Information:
- Sov. Energy Tech.; (United States), Vol. 2
- Country of Publication:
- United States
- Language:
- English
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