By William P. Sanders
Within the moment quantity of his two-book set on turbine steam paths, William P. Sanders, P.Eng., turns his professional research to fix and refurbishment concepts at present obtainable that might hold generators working with excessive degrees of availability and enhanced potency. additionally supplied are info on estimating monetary consequences linked to leakage from broken generators, that can lessen the price of strength. a whole research of caliber and inspection of synthetic parts to interchange broken parts is incorporated as well.
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Additional resources for Turbine steam path : maintenance and repair. Volume Two
These include the following: 25 Turbine Steam Path Maintenance and Repair—Volume Two The inlet nose. The steam entering the stationary blade row is moving with a relatively low velocity because kinetic energy has been extracted from it in the previous rotating blade row. In the majority of stages it is also entering in a principally axial direction. This means that the inlet nose is at about the 90-degree position. This is not always so; the stationary vane form must be selected from the requirements defined by the velocity triangle that is produced in the stage design process.
There are various methods of forming this steam chamber and nozzle plate. The methods used depend upon the inlet steam conditions and the method of controlling the unit (either throttle- or nozzle-controlled). In a throttle-controlled unit, the basic inlet is a continuous belt and steam flows around the complete 360 degrees. In 9 Turbine Steam Path Maintenance and Repair—Volume Two the nozzle-controlled unit, individual portions of the inlet are connected to individual stop and control valves. These inlet belts can form a portion of the casing (Fig.
Excessive curvature on the tail suction surface can create a large “wake” region downstream of the row (Fig. 11), thereby inducing losses in the stage. The separation angle “Γ” must be maintained at a minimum. It is probable the flow will be able to sustain the boundary layer for a short distance beyond the throat (“O”), but it will not be able to continue to turn with the curvature of the tail suction face. Fig. 11—Flow separation of a curved discharge tail. 27 Turbine Steam Path Maintenance and Repair—Volume Two Surface curvature and finish.
Turbine steam path : maintenance and repair. Volume Two by William P. Sanders