In this paper, a superposition distortion index K
A2 is introduced to indicate the relationship between the distortion intensity and the fan speed. The data to calculate the K
A2 was obtained by the distortion experiments using the two stages axial flow fan and distortion screens. A number of conventional distortion indecies such as K
ra2, DI, D
min, K
θ, K
D2, DC60 are presented to evaluate the each radial and circumferential distortion intensity. In previous paper, both radial and circumferential distortion indecies are expressed in one figure to evaluate the distortion intensity more accurately. This method, however, cannot tell the influence of the fan speed. The index K
A2 includes the radial distortion index Kra2 and the circumferential distortion index K
θ, the influence of fan speed. The influence of fan speed was obtained from the stall margine decrease of the fan characteristics curves.
抄録全体を表示