防颱阻雨百葉之三維流場模擬與壓損分析

A Study of Three Dimensional Flow Field Simulation and Pressure Drop Analysis on storm-resistant Louvers

簡良翰(Liang-Han Chien) ； 鄭晏弦(Yan-Shian Jeng) ； 徐千曄(Chien-Yeh Hsu)

《冷凍空調與能源科技雜誌》 67期 (2011/02) Pp. 40-48

https://doi.org/10.7087/JEHVACE.201102.0040

摘要

本研究探討防颱百葉於各種外氣風速、雨量舆送風量條件下之性能及流場結構。利用計算流體力學分析軟體(fluent)以模擬防颱百葉流道在穩態、三繼、不可壓缩的工作流體條件下的流場。經實驗量測數據比較，驗證本研究提出之模擬所得之壓降數據正確、流場結構合理。模擬結果發现阻雨葉片之数量可影響防颱百葉内部流場分佈，而其擺置位置舆渦流產生及壓降的增加更有密切關係。設計百葉時需避免；阻雨葉片位置不當、連續彎道和流道過於曲折均可能產生渦流，以免導致入出口壓差變大。反之，在適當位置增加阻雨葉片卻反而可以避免流場中產生大尺寸渦流，而達到降低壓損和提高阻雨率的效果。本研究依氣流場模擬結果，改良阻雨葉片與流道的設計，以達到降低壓损、增大流道收缩比的設計目標。此項技術將可使空調系统之入風口尽損降低、並减少耗能。

關鍵字

計算流體力量 ； fluent ； 阻雨葉片

並列摘要

This study investigates the storm-resistant louver in a variety of outside air wind speed, rainfall and air flow conditions of the performance and flow field structure. Computational fluid dynamics software (Fluent) was used to simulate a three dimensional channel of storm-resistant louver in steady state, assuming incompressible fluid. Pressure performance of various louver and drainable blade Parameters were investigated for different air velocity. The numerical simulation was verified by experimental data of pressure drops, and reasonable flow field structure. Number of curves should be reduced to reduce pressure drop. Number of the drainable blades is as important as the position of the blade. The flow channel cross-section should be as smooth as possible and prevent sharp variation of cress-sectional area which would generate vortexes and Increase pressure drop.

並列關鍵字

computational fluid dynamics ； fluent ； drainable blade