Study on Characteristics of Swirl Air-Outlet Diffusers : Part 2-Characteristics of Induction of Air-Outlet Diffusers with Flow Resistances at Secondary Air Side

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  • 内部誘引型旋回気流吹出し口に関する研究 : 第2報-二次空気誘引側に管路抵抗が存在する場合の誘引特性
  • 内部誘引型旋回気流吹出し口に関する研究-2-二次空気誘引側に管路抵抗が存在する場合の誘引特性
  • ナイブ ユウインガタ センカイ キリュウ フキダシ コウ ニカンスルケンキュウ

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Abstract

In the preceding paper, geometrical factors governing the characteristics of induction of air-outlet diffusers using swirl flows were found out in case of the secondary air side being open to the atmosphere, and their proper values were determined experimentally. In the present paper, relations between the geometrical factors and the characteristics of induction of diffusers are treated in case of attaching ducts system to the secondary air side. As a result, following facts were clarified: (1) When the flow resistances at the secondary air side are increased, the diffusers resonate with the pressure fluctuations in recirculating zones, and audible sounds are issued from them. (2) The characteristic curves which are expressed by relations between the intensity of induction and the ratio of the volumetric flow rate of the secondary air to that of the primary air become linear at no resonance regions. (3) The characteristics of induction of diffusers are affected clearly by the magnitude of cross-sectional areas of primary air inletnozzles.

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