Abstract: The effect of three kinds of devices, the base drag reducing plate, drag reducing strakes on tail and afterbody “terraces”, on drag reduction are experimentally invcstigated. Series of experiments are completed for selecting the geometric parameters and setting locations. The efficiencies are compared for different drag reduction devices. The results show that the base drag reducing plate is a simple and effective afterbody device of drag reduction. At α - 0, one of the base drag reducing plate, which has L = 0.8D and compatible setting locations, results in drag reduction 0.027 for body alone, with the relative value about 10.9% of body drag, and results in drag reduction 0.018 for configuration of body and tail, with relative value about 5.7%. The drag reducing strakes on tail also decrease drag, while afterbody“terraces”results in an increase of drag.

Key words: drag reduction, after bodies, wind tunnel test