High Speed Air Turbine of Small Capacity

Abstract

In case of small torque air turbine has often been used for the purpose to obtain high speed, for example to drive Gyro, Ultracentrifuge, and Internal-Grinder etc. In this case, usually radial flow impulse type has been adopted for its simple construction. It appears that there are few reports proposed up to this time concerning the turbine of such type with which we can conclude turbine efficiency, and so concerning Parallel nozzles used for it. An investigation was made to present a complete design data applied qualitatively to this type turbine design. The contents of this paper are as follows : (1) The characteristics of the radial flow type air impulse turbine and the best profile of buckets have been presented and checked by experiments. (2) Experiments of the radial flow type air reaction turbine have been given. (3) The author points out that bucket velocity coefficient of the turbines of this type will be about 0·6, and the comparison of the two has been discussed. (4) Results of reaction tests of parallel nozzles have been given, and he presents analytically simple formulae to conclude velocity and discharge coefficient of parallel. nozzles with arbitrary dimensions.