Abstract：In order to study the influence of tongue angles on hydraulic and structural performances of double channel pump, three cases with different tongue angles were simulated by the two-way coupling fluid-structure interaction(FSI)method. The result shows that in the hydraulic performance aspect, the influence of tongue angles on flow-head is weak, and the maximum difference is 0.09 m,but the maximum difference of efficiency is 1.1%. Tongue angle mainly affects the pressure fluctuation in and after the tongue edge,and the larger the tongue angle is,the stronger the fluctuation is.Because of the asymmetry of the volute, radial force on the volute is very large.It is periodical when the impeller rotates one circle and decreases obviously with the increasing of the tongue angle. In the structural performance aspect,stress concentration of the impeller appears in the suction surface near the outlet,and the volute stress concentration appears near the tongue edge.The increasing of tongue angle will increase the value of the maximum stress of the impeller and volute,but the amplitude will decrease. Displacement with the magnitude 10-5 m happens in the pump, and the maximum displacement appears at the outlet of the volute. It is periodical and is mainly influenced by the blade-passing frequency. The tongue angle has little impact on the maximum displacement,but has an obvious effect on the vibration velocity of the pump.Larger tongue angle can suppress the vibration.
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