流通內圓形阻礙物對流動特性的影響

INFLUENCES ON THE FLOW PROPERTIES OF FLOW WITH CIRCULAR OBSTRUCTION

郭家全(Chia-Chuan Kuo)；孔光源(Kuang-Yuan Kung)；林俊源(Chun-Yuan Lin)；謝嘉殷(Jia-Yin Shi)

障礙物 ； 分離現象 ； 流動特性 ； Flow characteristics ； Obstacles ； Separation

桃園創新學報

35期（2015 / 12 / 01）

107 - 123

繁體中文

本研究以數值釋法探討因異物阻塞或維修填補的需求，造成流道內有障礙物時，當流體流經這些障礙物時，流體之流動特性的變化。研究結果顯示：當流體流經障礙物時，在障礙物的上游，壓力明顯上升。在障礙物下游，壓力從負值逐漸增加，流體的速度則逐漸加速至出口速度。因流道內的障礙物會造成流道減縮，以致流體流經障礙物附近時，因流道截面積的減小，流體速度增到最大值，其壓力值則減到最小值。通過障礙物之後壓力值再逐漸增加，分離現象出現於障礙物後方，流體的速度則逐漸減速至出口速度。

In this study, the characteristics of fluid, which flow through a channel with obstructions due to sediments or repair-packing demand, were investigated by numerical method. The results showed that the characteristics of fluid changed when the fluid flows through the obstacles. The pressure increased significantly on the upstream of the obstacle. On downstream of the obstacle, the pressure was gradually increased from a negative value, and the velocity was gradually accelerated to the outlet velocity. The obstacle leaded to the reduction of the cross section of the channel. The fluid velocity was increased to the maximum value, and the pressure dropped to the minimum value. After through the obstacle, the pressure increased, separation phenomenon appeared and the fluid velocity gradually slowed down to the outlet velocity.