Steady-State Thrust Augmentors and Jet Pumps

摘要

The state of the art in steady-state augmentors and jet pumps is briefly reviewed and a general performance theory developed. Generalized charts are presented giving the augmentation ratio obtainable from an optimized eductor, together with the associated geometrical and fluid-dynamic parameters. This theory is shown to give good agreement with experiment. Experimental measurements made by various investigators in the past do not achieve the predicted optimum performance, however, because of various deviations from optimum design in their test eductors. The performance of eductors in an axial stream and the total head rise obtainable through an eductor are both investigated theoretically. The report concludes with a brief survey of various unconventional eductors, including multistage units, Coanda eductors and crypto-steady flow devices. (Author)