熔盐泵分流式空间导叶内部流动及其非定常特性

为了抑制熔盐泵空间导叶内存在的二次流以及轴向旋涡,提高熔盐泵的效率和稳定性,提出一种分流式空间导叶体.采用k-ε模型、SIMPLE对2种不同形式空间导叶的熔盐泵模型进行了数值模拟,以获得2种不同形式熔盐泵的外特性参数及其内部的速度、压力分布等特性.结果显示:在0.8Q和1.0Q下,分流式空间导叶内部速度分布更为均匀,导叶吸力面二次流、旋涡明显减少,提高了模型泵的效率.在1.2Q下,分流式导叶导致模型泵效率降低.但在空间导叶出口速度分布均匀,低速区域明显减少.分流式空间导叶内部压力脉动幅值叶频占主导地位,其出口压力脉动得到明显改善,在设计工况下,压力脉动幅值比常规空间导叶低近40%,空间导叶轮缘面压力脉动普遍高于轮毂面,在导叶轮缘面上,其压力面的压力脉动幅值低于吸力面;在导叶轮毂面上压力脉动幅值则基本相同.

Interior flow and unsteady performance of molten salt pump with splitter space guide vane

In order to suppress the secondary flow and axial vortex to improve the performance of the molten salt pump. A splitter space guide vane was raised.Using k-ε model and SIMPLE on simulation of the model molten salt pump with two forms of space guide vane.Then acquire the performance of two forms of molten salt pump and the interior velocity and pressure flow. The results show that at 0.8Q and 1.0Q flow,the distribution of the velocity in the splitter space guide vane is more even,the secondary flow and vortex near the suction side of guide vane reduced.As a result,the efficiency of the model pump is improved.At the 1.2Q flow,the splitter guide vane result in the low efficiency.But the distribution of velocity at the outlet of the space guide vane is even and the area of the low velocity decreased.The amplitude of the pressure fluctuation in the splitter space guide vane is determined by the blade frequency.The pressure fluctuation near the outlet is improved.At the design operating condition,the amplitude of the pressure fluctuation is lower 40% than the regular space guide vane.The pressure fluctuation near the flange is higher than hub.At the flange side of the vane,the pressure fluctuation on the pressure side is lower than suction side.The pressure fluctuation is similar on the hub of space guide vane.