A Consideration on the Labyrinth Packing of Straight Through Type

Abstract

Some theoretical researches on the labyrinth packing which have been reported are usually on the ideal case. But in actuality these theories cannot be applied especially to the straight through type, because the effects of "carry over" are ignored. So J. Jerie introduced a simple theory on the labyrinth packing, in which the problem of "carry over" was taken into account However, there was a serious mistake in it, so it was corrected in this paper, theoretically introducing the more reasonable relations among the leakage, pitch of the throttling fins, clearance and the number of throttling fins. The results of this theory were compared with our experimental results and it was ascertained that they were in good agreement with the experiment. Moreover, by developing this theory, our experimental results, in which the leakage loss took the smallest value when the pockets were shallow rectangu1ar grooves, could be explained.