船舶上層空氣流場數值模擬研究

The numerical analysis of flow field on ship deck

林瑞國(Reui-Kuo Lin) ； 張台麟(Tai-Lin Chang) ； 蔡順峯(Shun-Feng Tsai)

《台北海洋技術學院學報》 8卷2期 (2017/06) Pp. 85-101

摘要

本文主要是利用計算流體力學方法探討位於船舶上層結構之煙囪形狀、各種不同風向角度之相對速度、排煙溫度情況下，空氣流場流經上層結構對排煙擴散分佈之數值模擬與分析。以商船於風洞試驗中所觀察之不同煙囪幾何結構之流場變化與物理現象機制，利用計算流體方式，分析在不同風向與角度之相對速度所造成之煙流、擴散路徑及煙流溫度分佈情形，探討煙囪高度、幾何構型、不同之風向角度、排煙溫度、排煙速度比等各參數對行進間之船舶運動變化。建置針對商船因上層結構之煙囪形狀、各種不同風向角度之相對速度、排煙溫度之數值分析模式，並藉此模式探討未來因煙囪形狀、位置及各風向速度流場變化，以提供設計與改善減少阻力之可行性。

關鍵字

計算流體力學 ； 擴散分佈 ； 風洞試驗 ； 煙流擴散 ； 大氣風壓

並列摘要

This paper aims to simulate the exhaust flow field of ship by the method of computational fluid dynamics (CFD) concerning with the interference by exhaust temperature, shape of stack and rolling angles etc.. In this research wind tunnel test for a corvette has been performed to attain associated experimental data, which were used as a reference basis. During simulation process several configurations of stacks have been selected, and combining with various rolling angles, exhaust temperatures and velocities, we have gene-rated numerous cases from which the diffusion paths and temperature distribution of the exhaust flow field can be clearly observed and analyzed. In terms of numerical simulation, the packaged program computational fluid dynamics software has been adopted. The simulation results also possess the same trend as the experimental data, which have initially confirmed the methods developed here can be used for the arrangement of stack and superstructure at the stage of initial and conceptual design of ships.

並列關鍵字

computational fluid dynamics ； diffusion distribution ； wind tunnel test ； smoke diffusion ； atmospheric pressure

參考文獻

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