修正６枚平羽根ディスクタービン翼の動力特性

抄録

A conventional disk turbine impeller with 6 flat blades was modified for the blade geometries, namely, the number and the axial width of the blade. An impeller with the 12 flat blades of standard width (12-STD) and an impeller with 6 flat blades of small width (6-Small) were employed to produce a nearly uniform liquid flow in a narrower flow path between the neighboring blades of the rotating impeller. The internal flows of such impellers in a baffled vessel were examined by means of PTV and their power characteristics were evaluated, in comparison with that of the 6-standardly bladed turbine type impeller (6-STD). With both 12-STD and 6-Small impellers, the head characteristic rather than the flow one was improved because of the flow patterns reformed in the intensity and directionality leading to the uniformity. The resultant power transmission differed among the impellers but the efficiency was unchanged, which suggested viscous losses corresponding to the powers.