부산대학교 도서관

A sonic, highly under-expanded, jet of hydrogen was injected transversely into a supersonic (Mach 1.5), high-temperature (static temperature {approx}1400 K) argon-oxygen free stream. Laser-based diagnostics were utilized to non-intrusively probe the combustion of oxygen-hydrogen. Planar laser-induced fluorescence (PLIF) was used to image the flow. The images were used to determine both H{sub 2} jet penetration depth profiles and two-dimensional temperature maps of the combustion region. The hydroxyl radical (OH) was used as the PLIF target species in the flow because it is an important and prominent intermediary of the hydrogen-oxygen combustion reaction and it has many strong ro-vibrational lines suitable for laser excitation. The very short gate width of the camera used ({approx}30 nsec) results in images that are well resolved temporally. Good spatial resolution (51 {times} 22 {mu}m) was achieved with a uv-intensified CCD camera and suitable optics. jet boundary penetrations are measured for a range of injection (450--1000 torr) and free stream (12--55 torr) pressures. The primary parameter that determines the jet trajectory is the ratio of the dynamic pressures of the jet to the free stream, labeled q. Previous experiments dealt with values of q on the order of one, but this study involves values between 5.9 and 38.6. The penetration profiles are compared where appropriate to previous results for both reacting and nonreacting flows. Despite the large extrapolation, reasonable agreement between the results established in the present study and those of other investigators is found.