Decrease in the Stresses on the Tail Joint of a Steam Turbine Blade by Changing the Shape of the Support Pads
DOI:
https://doi.org/10.15407/scine22.01.024Keywords:
steam turbine, tail joint, stress-strain state, process gap.Abstract
Introduction. The herringbone tail joints of long working blades in steam turbines, which function as multi-support structures, operate under complex stress conditions characterized by uneven distributions of both general and local stresses. Improving the geometry of the tail joint enhances the safety margin and service life of this critical component.
Problem Statement. At present, the uniformity of stress distribution across the support teeth of the tail joint is compromised by the required technological gap of 0.02 mm. This gap prevents full contact along part of the teeth, producing an uneven load distribution across the remaining teeth.
Purpose. The aim of the research is to develop an original design in which a specially shaped supporting surface of the teeth compensates for technological gaps and increases the uniformity of stress distribution in multi-support herringbone-type tail joints.
Materials and Methods. Finite element methods for modeling power-generation equipment have been applied. The calculation algorithm used here has served as the basis for a methodology for designing high-stress, multi-support mounts in large steam turbines.
Results. An original design featuring a specially contoured supporting surface of the teeth has been proposed. This design has increased the uniformity of stress distribution in multi-support tail joints of working blades in high-power steam turbines. It has significantly reduced the load on the upper teeth, redistributing these loads toward the lower teeth, which have previously been insufficiently engaged.
Conclusions. This research has proposed a novel approach to modifying stress conditions in herringbone tail joints of powerful steam turbines through the use of specially shaped (cylindrical) bearing surfaces that compensate for technological gaps. The resulting design has improved load uniformity across the teeth and has enhanced the strength and service-life characteristics of the entire assembly
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