本研究是以數值計算進行二維向量噴嘴內流場之模擬分析及效能評估。本研究數值模擬分析模式已經由文獻之實驗結果驗證其準確性，並已成功地建立動態網格模擬機制，且利用動態網格進行平板受力和出口推力變化之分析。由模擬結果發現，噴嘴平板擺動會造成出口平均速度下降，使其推力降低。在平板擺動狀態下，內流場之上平板偏折部分產生局部低壓區，可明顯觀察出一斜震波提升流體壓力，而暫態之平板受力與穩態結果相比，上平板受力則約增加3.3%，下平板受力約增加6.5%。而為使噴嘴出口流場不會因擺動造成對稱平板與出口面無法垂直所產生之出口局部擴張現象，在噴嘴尾部平板於擺動時延伸其長度，以增加噴嘴推力。模擬結果證實其推力相較於未延伸其長度之設計可增加約25.1%。在單純只考慮噴嘴內流場情況下，模擬結果與真實情形會有差距，故增添外流場模擬噴嘴外之環境壓力應會使結果更加準確，而計算結果發現增添外流場確實較符合實際情況。

In the present study, the internal flow of a two-dimensional thrust-vectoring nozzle is analyzed and its thrust performance is evaluated numerically. The numerical simulation model has been verified by the experimental results. The dynamic-grid simulation mechanism has been developed successfully, and has been employed to carry out the analyses of the flap’s stress and the thrust variations. It has been found that the swinging of the flap makes the averaged exhaust-velocity drop, reducing its thrust. The low-pressure area of the top-flap of the flow can be observed an oblique shock raising pressure. As the stress of the flap in the swinging condition is compared to that in the stable state, the stress of the upper flap increases approximately by 3.3%, and that of the nether flap increases approximately by 6.5%. In addition, extending the length of the swinging flap to avoid the flow diffusion at the nozzle exit increases the nozzle thrust significantly. The present simulation confirms that it increases approximately by 25.1% in comparison to that without extending the length of the swinging flap. The present results of simulation are different from those of the real situation if only the internal flow field of the nozzle is taken into account. The results show that the simulation considering the external flow field is more accurate in presenting the actual flow situation.

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