- 期刊
- OpenAccess
75°-40°雙三角翼上方渦漩結構靜態與動態特性之研究
Study of Static-Dynamic Characteristics of 75°-40° Double Delta Wing
摘要
本文主要探討雙三角翼翼面上方渦漩流場。探討方向有靜態流場與動態流場兩大主題。在靜態流場時觀察雙三角翼翼面上方渦漩結構及其交互作用隨攻角變化之影響；在動態流場時則探討受到俯仰簡諧擺盪對其渦漩潰散位置及渦漩動態發展模式之影響。所使用模型爲：75/40度之雙三角翼，其翼緣轉接處在翼弦長之中央點。在定性分析上則以染液釋放法及雷射切光法進行流場觀察，而定量分析以FLDV量測特定截面上之流場結構。試驗結果顯示：在靜態流場實驗中，輔助翼渦漩與主翼渦漩潰散位置會隨著攻角的增加從機翼頂點方向移動，而且其交互作用現象亦隨之改變。在動態流場實驗中，由於雙三角翼受到俯仰簡諧擺動作用的影響，其輔助翼渦混潰散位置具有遲滯特性，亦即達到延遲渦漩潰散之效果。且在俯仰簡諧運動中，流場變化與簡諧擺盪的攻角之間存在一相位差。
並列摘要
The purpose of this research is to understand that the vortical structure on a double delta wing. The researching topics have static and dynamic flow field. To understand the vortical structure and interaction of strake and wing vortices vary with the angle of attack in steady flow and the effect of S.H.M. on a double delta wing. The model is a sharp-edge double delta wing (75/40, kink at midchord). Dye-injection and laserlight-sheet visualization technique are applied in qualitative flow visualization and velocity measurment (FLDV) is applied in quantitative measurment. The results of the test show that an increasing angle of attack leads to the breakdown of strake and wing vortices moving upward the apex of a wing and the interaction of vortices altered in steady flow. On the effect of S. H. M., the breakdown of the strake vortex presented hysteresis, in other words, delays the vortex breakdown of it. There is a phase angle between flow field varying and attack angle.