Abstract

In order to improve the problem of low efficiency of water jet propulsion devices at low speeds, a special multi-ring structure of water jet propeller nozzle is designed based on the Coanda effect. On the basis of the credibility of numerical calculation methods, the hydraulic performance of the special structure is analyzed by using the method of computational fluid dynamics. The results show that the designed structure can effectively improve the problem of low efficiency of water jet propellers at low speeds, which is of great significance to better the performance of water jet propellers.

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