Abstract
A theoretical and experimental study is made of the base drag of a thick axisymmetric annular jet operating free from ground effect. An approximation for the recirculation mass flow in the base region is obtained through the use of an experimentally determined mixing coefficient. A thrust recovery factor, based on this mixing coefficient, is derived theoretically and compares favorably with the experimental results. These results show that the base drag losses of a thick annular jet decrease with increasing jet thickness to base diameter ratio. The loss in jet thrust is found to be less than 10% for the worst case considered (jet thickness to base diameter ratio of 0.048).
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