Investigation of Steam Turbine Nozzle and Blading Efficiency

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Abstract
The paper describes the essential characteristics of the passages forming the fixed and moving elements of multistage high-efficiency turbines, whether impulse or reaction. The problems of nozzle investigations by static and dynamic methods are discussed, and a new nozzle tester is described. Reference is made to the Reynolds number; its physical significance is explained, and experimental results are used to demonstrate its effectiveness as a correlative factor. The significance of the static (nozzle) efficiency and the dynamic (turbine) efficiency is discussed, and the essentially different way in which they are affected by the discharge angle is pointed out. A mathematical expression is derived for the relation between static and dynamic efficiency for 50 per cent reaction blading as a function of the discharge angle. This, in conjunction with the Reynolds number, is used to demonstrate the unity and consistency of static and dynamic test results which at first sight seem to be conflicting or unrelated.

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