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هوافضا::
داکت زیرین
The typical front underslung duct (fig. 3(a)) Is'also.more favorable than the rear underslung type because thefront underslung duct has only a relatively thin boundary layer at the Inlet; somewhat reduced inlet velocities
- ¦ For the- flow In a typical -rear underslung duct vith .a thick boundary layer-- on one vail,' experience has Indicated that .the curve for the reotangular duot generally underestimates the loseeB and that mlnlmua losses ooour with expansion angles ¦somewhat lass than 10°. ....
In the oase of a flap at the.rear of an underslung duct, the effeot is probably somewhat less than that shown in the figure, owing to the aspect ratio of the flap.
Far an underslung duct the expansion must be gradual.
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