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以某泵站双向竖井贯流泵装置为例,采用CFD数值模拟方法对模型泵不同的转轮叶片、叶轮位置及导叶位置方案进行了数值模拟,最终确定了改进泵装置模型结构参数,并分析了改进模型的综合特性和流场分布规律。结果表明,反向工况由于出水流道内无导叶进行导流和能量回收,出现了明显的回流、漩涡区,降低了流道效率,其出水流道流态较差,且因前置导叶的存在,恶化了叶轮进口水流条件,同时降低了装置过流能力与叶片做功能力,造成反向工况泵装置效率明显低于正向工况。
Taking a two-way vertical shaft pump device in a pumping station as an example, the CFD numerical simulation method was used to simulate the different rotor blades, impeller position and guide vane scheme of the model pump, and the structural parameters of the pump model were finally determined The comprehensive characteristics of the improved model and the distribution of the flow field are analyzed. The results show that in the reverse working condition, the guide vanes in the outlet runner are used to conduct the diversion and energy recovery, which results in obvious backflow and vortex area, which reduces the efficiency of the runner. The flow path of the outlet runner is poor. The existence of the leaves deteriorates the inlet flow conditions of the impeller and at the same time reduces the overcurrent capability of the device and the work capability of the blades, resulting in the efficiency of the reverse-working pump device being obviously lower than that in the forward working condition.