本文利用雷射都卜勒測速儀量測衝壓火箭引擎中側向進氣彎道和燃燒室之三維流場 探討側向進氣彎道中之導板數對側向進氣彎道和燃燒室內流場結構之影響，量測物理量，包括平均速度、紊流強度、雷諾應力、紊流動能、結構參數及頻譜分析等，詳細分析流場的型態與結構。研究結果與技術可應用於具有相似幾何形狀的彎管管路系統和衝壓火箭燃燒室，如：旋轉機械內葉片間之通道、熱交換氣管路、飛行器之進氣道、流體混合器、工業集塵設備、通風系統等之流場。此外，並應用質點影像測速儀量測具彎曲母管側向動脈瘤之定常流和脈動流流場，定性與定量探討母管曲率對側向動脈瘤瘤內流場之影響，另外由於加快心跳速度伴隨Womersley數和Reynolds數的提高對側向動脈瘤之影響，亦有詳細的研究。研究結果有助於進一步瞭解血流動力特性對人體腦部側向動脈瘤之影響。本文的內容共分為五章，第一章是簡介彎管流場、側向進氣衝壓引擎和側向動脈瘤以及本文的研究動機。第二、三、四章分別針對側向進氣彎道、燃燒室和側向動脈瘤的文獻回顧、研究目的、實驗設置和條件以及量測結果，作介紹和討論。第五章為本文的結論和建議，並且提出本文的主要貢獻。

The flowfields in the three-dimensional side-dump combustor inlet and chamberwith various numbers of inlet guide-vanes have been characterized using laser-Doppler velocimetry. The Reynolds number based on the bulk mean velocity andhydraulic diameter of the curved combustor inlet and the combustor chamber were25300 and 26000, respectively. Four significant changes of the flow features inthe curved combustor inlet occur through insertion of the guide vanes. The firstis the reduction and suppression of the flow reversal region; the separatedflow rergion along the inner wall decreases with increasing guide-vane numberand vanishes through installing three guide vanes. In addition, the criticalReynolds number at which flow separation is absent in the curved combustor inletis found to decrease with increasing product of radius and aspect ratios. Thesecond event is that the turbulence levels are lowered and more isotropic; inmost regions, all three turbulence intensity components, and the turbulentkinetic energy decrease with increasing guide-vane number. The third is asignificant reduction of the velocity differences between the inner and outerwalls and, hence, a more uniform distribution of the velocity ahe passages nearthe exit of the curved combustor inlet. The last is the peak frequency of theradial velocity power spectra is found to increase with increasing product ofradius and aspect have no such a trend. In the dome region of the combustor inlet-jet plane, there is one pair ofcounter-rotating vortices for the no-vane, one-vane, and two-vane cases and twopairs of counter-rotating vortices for the three-vane case, respectively. Thistrend is reversed in the combustor impinging plane. The combustor flowfielddownstream of the Xc*=2.5 station is insensitive to the variation of theguide-vane number arranged in the side-inlet duct. For the combustor withside-inlet guide vanes, it is suggested that more fuel injection positionshould locate adjacent to the upstream side of the side-inlet duct in order tomake more of the side-inlet injected fuel recirculating upstream into the domeregion and increase the fuel residence time in the combustor. The presentedturbulence level, vortex strength in the dome region, pressure loss, andpressure oscillation tend to suggest that the curved combustor inlet with twoguide vanes is beneficial to the successful performance of the combustor. Pulsatile and steady flowfields in a lateral aneurysm model arising from theparent vessel with radius of curvature to vessel diameter ratios of 2.5, 5, andoo are presented in terms of particle tracking velocimetry (PTV) measurementsand flow visualization. The steady-flow case has a Reynolds number of 600 andthe pulsatile-flow one has a Womersley number of 3.9 and Reynolds number of600. The intra-aneurysmal flow velocity, vorticity, and wall shear stressesincrease with increasing curvature of the parent vessel. It is suggested thatthe lateral aneurysm arising from a straight or small-curvature parent vesselhas a tendency to thrombosis whereas the lateral aneurysm arising from alarge-curvature parent vessel is more risky. Although an increase of theWormersley number or Reynolds number does not qualitatively change the flowpattern in the aneurysm sac, it is found that in the circumstance of highheartbeat rate, i.e. , high Wormersley and Reynolds numbers, the aneurysm sacis filled with higher-velocity and -vorticity fluids, and the intra-aneurysmalwall is undergone higher level of wall shear stresses. In addition, the effectof the parent vessel curvature on the flow activity and the wall shearstress is larger than that of the Wormersley and Reynolds numbers, especiallyfor the large curvature case, and the effect of the Reynolds number is theleast among these three effects.