| Citation: | HU Jian, WANG Nan, HU Yanget al. Performance comparison of accelerating duct and decelerating duct[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(2): 240-252. doi: 10.13700/j.bh.1001-5965.2016.0140(in Chinese)
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In order to study the loading characteristics of different forms of ducted propellers, this paper analyzes the hydrodynamic performance of accelerating duct and decelerating duct and their influences on propellers by using computational fluid dynamics (CFD) method. The computation domain is divided into two parts:cylindrical domain containing the propeller and outer domain containing the duct. The computation domain is discretized by using fully structured gridding technique to optimize the quality of grids and improve the accuracy of calculation. The continuity of physical quantities such as fluid velocity and pressure between different domains is guaranteed by using the interface technique. This paper analyzes the hydrodynamic performance of JD7704+Ka4-5508 first, and the according results are compared with those by experiments to verify the rationality of the model and the grids technique. On this basis, this paper analyzes the hydrodynamic performance of accelerating duct and decelerating duct with varied cambers and angles of attack, and their influences on the loading state of propellers. The study shows that the accelerating duct and decelerating duct due to the variation of the cambers and angles of attack have different hydrodynamic performance, and they can optimize the propeller's operating conditions and loading characteristics greatly.
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