Supersonic Nozzle Flow Separation and Resulting Plume Characteristics

abstractcts - 0072964 d。一个会聚/发散喷嘴，只要有适当的比例：“上游滞止压力/接收压力”，就能提供充分膨胀的超音速气流。对于高于完全亚音速流动的压力比，但低于上述“适当水平”的压力比，将从发散通道输送亚音速流动。PI指出，适当轮廓的发散通道可以提供强烈的非定常流动，并且这种出口流动可以用于许多应用。目前的过渡性资助（一年）是为了让PI更好地记录这种非稳态流动的基础，并在适当的情况下确定一个重点研究工作，以更彻底地调查它。

AbstractCTS-0072964D. Papamoschou, University of California, IrvineA converging/diverging nozzle, with an adequate ratio: "upstream stagnation pressure/receiver pressure", will deliver a fully expanded supersonic flow. For pressure ratios above the value for a completely subsonic flow, but below the "adequate level" noted above, a subsonic flow will be delivered from the diverging passage.The PI notes that a properly contoured diverging passage can provide a strongly unsteady flow and that this exiting flow can be used for the benefit of a number of applications. The present bridging grant (one-year) is to permit the PI to better document the basis for this unsteady flow and to define, if appropriate, a focussed research effort to more thoroughly investigate it.