Abstract:bstract:Taking a BQS20—40—5.5 pump commonly used in coal mine draingage as a cage.three main factors,including inlet blade attack angle,outlet blade angle and blade number,were chosen to carry out orthogonal test.Nine test schemes were acquired by choosing three levels to the parameters sta—ted above by using k(34)orthogonal table.By using SLMPLE algorithm and standard k-ω turbulencemodel,single phase pure water and solid-liquid two—phase flow simulations were carried out according to the nine schemes defined by orthogonal test.The relationship between efficiency and factors were got through range value calculation for simulation results.The results show that the outlet blade angle and blade number are different in single phase pure water and solid-liquid two·phase flow simulations.It Can be seen that small solid particles concentrated on the impeller pressure side,move to the out peripheral along the pressure side,and discharge at the impeller outlet with a small flow angle.Some particles in the departure of the impeller pressure side collide with the blades pressure side,and increases the impel lererosion.Therefore,the outlet blade angle should not be too large in the design of solid—liquid two·phase flow pump.When the two phase theory was applied in the optimization design of BQS20—40—5.5 pump,the design point efficiency is higher than the national standards,the wear of the impeller and the operational life of the pump are greatly improved.
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