穩定流場中移動物體之流場可視化

Abstract

本文主要的目的以實驗方式探討穩定流場中，移動剛體所引發的流場變化。本文的實驗分兩部份，第一部份為流場可視化，第二部份則是熱傳量的量測。在流場可視化部份，採用放煙線法，進行流場可視化，觀察穩定流場中，平板改變攻角與矩形剛體往復運動所形成的流場。在熱傳量的量測部份，利用□揮發質傳法，量測矩形剛體在穩定流場中往復運動，所改善的熱傳效果。觀察流場的結果，可清楚看出剛體移動後，其所引發的流場遷移與變化。同時，剛體往復運動，對熱傳效果亦有增進的作用。

In this study, the experimental methods are used to study the flow field, which is ihduced by the moving objects in the steady flow. Two experiments are discussed in this paper. One of them is the visualization of the flow field, and the another one is the measurement of the heat transfer. The Smoke-wire method is introduced to visualize the flow field. This paper observes the flow induced by a plate changing its attacking angles, and by a square block moving forwards and backwards. By applying the heat-mass transfer analogy, the heat transfer coefficient can be evaluated. The observation of the induced flow is clear to study the changes after the objects moved. Also, moving forwards-and-backwards can make improvement of the heat transfer efficiency.