J051051 スクロール舌部による熱交換器一体型遠心ファンの熱流動特性への影響([J05105]流体機械の研究開発におけるEFD/CFD(5))

概要

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In recent years the fan heater used for industry and residence has become smaller, lighter and more silent as the result of improvement. However there are problems that the fan heater size is very large, and the noise is very high due to air pressure loss of heat exchanger. Therefore we have been developing the centrifugal type fan with the function as heat exchanger. The features of this new type fan heater are that the fan heater size is very small and silent because the fan and the heat exchanger are in one body. This paper described the effects of the flow velocity distribution on different scroll tongue by numerical simulation with Front Flow/blue. In RO scroll, inner flows that after passing scroll tongue effects pressure distribution. Negative pressure area distribute more broadly near the scroll tongue. This negative pressure draws inner flow on pressure side surface. In contrast, inner flow between fan blades with R7.5 scroll is stable steady flow so that negative pressure area is reduced.
2011-09-11