横流送風機の寸法効果に関する研究 : 第1報, 特性曲線に及ぼす羽根車寸法の影響

概要

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Experimental investigations into an affinity law of cross flow fans have been conducted using three fans with different dimensions but good geometrical similarity, and peculiar scale effects appearing on the performance curves have been shown. The results obtained have been confirmed with a series of additional experiments which examine the effects of errors in geometrical configurations of tested fans, as well as effects of the flow turbulence and velocity distortions of the inlet flow into the fans. The critical Reynolds number based on the chord length and tip speed of the rotor is as small as (1〜1.5) × 10^4. The performance curves represented in a usual nondimensional form are affected by Reynolds number as well as the fan dimensions, which shows that the performances of cross flow fans never simply obey the conventional fan law, but it is essential to introduce the fan dimensions to represent the performance curves in a universal form.
1992-06-25