本研究主要探討微泡致動器應用於彈體氣動力之控制；微泡致動器是利用微模技術製作而成，由於致動器是可橈式的，因此可貼於彈體表面而不破壞彈體之幾何外形；微泡致動器是以高壓氣源作為致動之來源，在整個實驗中，高壓氣源固定在約11psig，此時微泡致動器鼓起之垂直高度約為1.2 mm。
　　實驗結果顯示，當兩個致動器位於弱渦流側與強渦流側之適當位置同時致動時，對於減輕彈體在高攻角時所產生巨大之側向力具有顯著的效果。實驗利用流場速度及彈體表面壓力量測，進一步發現致動器致動造成彈體側向力減輕之機制；首先，當弱渦流側之致動器在適當位置致動時，彈體兩側之渦流更為不對稱，弱渦流提早遠離彈體表面，也促使弱渦流側提早產生一個新的渦流；其次，當弱渦流側之致動器致動時，在弱渦流側造成一個很強的剪力層，使得弱渦流側的新渦流不但提早產生，而且強度明顯增強；而強渦流側之致動器在適當位置致動時，則是促使強渦流側之邊界層提早產生分離。

　　Side forces on slender bodies of revolution at medium to high angle-of-attack (AOA＞30o) have been found from a large number of investigations. Asymmetric vortex pairs over a slender body are believed to be the principle cause of the side force. Under some flight conditions, the side force may be as large as the normal force acting on the slender body. In this study, reduction of side force using micro balloon actuators on a high angles-of-attack cone-cylinder slender body was study. Flexible micro balloon actuators are made of PDMS elastomer and micro molding techniques, which can be packaged on curve surfaces of a cone-cylinder slender body and can inflate about 1.2mm vertically after actuation. Side force measurement results indicate that side forces can be significantly reduced if actuators located respectively in the vicinity of weak and strong separated vortex structures are actuated simultaneously. The side force reduction mechanism has been investigated via hot wire as well as surface pressure measurements. It is interesting to find that instead of changing vortices from asymmetric to symmetric pairing for side force reduction, the employment of micro balloon actuators cause vortices become even more asymmetric. The reduction of side force by using micro balloon actuator array can be characterized by two mechanisms. The first is due to the fact that the weak side vortex lifts off prematurely since micro balloon actuator changes the vortex pair structures into a more asymmetrically positioned pattern, allowing a new (third) vortex forms in the near wall region. The second mechanism is that the newly generated (third) vortex could be strengthened due to the micro balloon actuation. The birth and evolution of the new (third) vortex has become the most influential factor for the local side force distribution. Micro balloon actuators can obviously alter the evolution process of the new (third) vortex structure. It is suggested that local side force distributions can be manipulated from negative to positive value along the body. Therefore, optimal side force reduction by cancellation of all the vortex-induced forces around the body surface.

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