Abstract
In this paper, it is discussed regarding influences of variable pitch blade to the starting and running characteristics of Wells Turbine with variable pitch blades.
Taking notice of Wells Turbine with variable pitch blades, which is expected to improve the starting and running characteristics, we studied effects of variable pitch blade against to starting and running characteristics by means of numerical calculation.
Numerical calculation was made by repetitive calculation including time transition from 0 s to steady running condition, using the formulas arranged.
As the result of numerical calculation, the followings were confirmed that as the blade angle grows larger; (1) Starting Torque becomes larger, (2) it becomes easier to make self-starting, (3) it becomes easier to make cut-in-starting, (4) starting time becomes shorter, (5) turbine efficiency becomes higher, and (6) output becomes larger compared with fixed angle one.
Conclusively, through this study, it was confirmed that Wells Turbine with variable pitch blade is effective for getting the better starting and running characteristics, further, shall be put into practical service, if proper design shall be made eliminating the remaind problems.
