横流送風機の寸法効果に関する研究　第２報　内部流動に及ぼす羽根車寸法の影響および特性表示法の検討

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  • Scale Effects in Cross Flow Fans. 2nd Report, Effects of Fan Dimensions on Flow Fields and the Universal Representation of Characteristics.
  • オウリュウ ソウフウキ ノ スンポウ コウカ ニ カンスル ケンキュウ 2 ナ

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Laser Doppler Velocimeter (LDV) measurements of velocity fields and determination of static pressure distributions in the rotors of cross flow fans with good geometrical similarity but different dimensions have been made, and the clear scale effects appearing in the flow details have been shown. As the fan dimensions become larger, the internal flow fields tend to be more active, i. e., nondimensional velocity, vorticity, velocity fluctuations and pressure drops in the eccentric vortex increase. The mechanisms of generation and dissipation of the eccentric vortex in the rotor have been discussed, and it is suggested that the scale effects are attributed to differences in the rate of diffusion of the circulation vortices in the recirculatory region. A new procedure to represent the characteristics of cross flow fans in a universal form has been proposed by analyzing the influences of Reynolds number and fan dimensions on performance curves.

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