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1 2008

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Vane bowing and clocking technique influence on two-stage turbine performance

Krysiński J., Smolny A., Błaszczak J. R.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2008

nr 133

175--186

This paper describes the experimental investigations of the clocking effects on the turbine performance characteristics. The turbine was equipped with rake temperature and pressure probes and fast response miniature pressure sensors and surface-mounted hot film sensors. To understand better an interaction mechanism and show how some flow effects can be successfully employed in estimation and correlation of stage losses, quasi-three-dimensional simulations of the airfoil clocking have been performed. Time-averaged and unsteady data including performance of particular blade/vane rows are presented and used to minimize the stage loss production due to upstream flow conditions. The results show a turbine total efficiency variation from 0.1% to 0.5%. The experiments have shown that the clocking effect seems to be mainly related to the low momentum flow region, which should be introduced into a leading edge region of the downstream vane/blade row, where the fluid momentum will be already low. Primary loss production in the blade row will be a function of the geometry and inlet time mean flow conditions and the distribution along the circumferential direction.