摘要：The authors research the jet from an asymmetrical two-dimensional nozzle, especially concerning the effect of the lip length of the nozzle. Experiments are conducted at a Reynolds number of 6000. The aspect ratio of the nozzle exit is fixed to 300. And, the lip length is 0, 2.0 h , 3.3 h and 5.0 h , where h denotes the height of the nozzle exit. Using a hot-wire anemometer, the authors show mean-velocity and turbulence-intensity profiles at various downstream sections, in order to reveal fundamental characteristics of the jet in both the near and far downstreams. Furthermore, in the near downstream, the authors visualise the flow by glycol smoke so as to get quantitative information using a PIV technique, and perform the dominant-frequency measurements to reveal flow-instability characteristics.
