In order to study the influence of the position of the bulb on the hydraulic performance of a
submersible tubular pump device, based on a large-scale pumping station, two schemes—involving a front-mounted bulb and a rear-mounted bulb, respectively—were designed. The front-mounted scheme uses the GL-2008-03 hydraulic model and its conventional guide vane, while the rearmounted scheme uses the optimized design of a diffuser vane. The method of combining numerical simulation and experimental testing was used to analyze the differences between the external and internal characteristics of the two schemes. The results show that, under the condition of reasonable diffusion guide vane design, the efficiency under the rear-mounted scheme is higher than that under the front-mounted scheme, where the highest efficiency difference is about 1%. Although the frontmounted bulb scheme reduces the hydraulic loss of the bulb section, the placement of the bulb on the water inlet side reduces the flow conditions of the impeller. Affected by the circulation of the guide vane outlet, the hydraulic loss of the outlet channel is greater than the rear-mounted scheme. The bulb plays a rectifying function when the bulb is placed behind, which greatly eliminates the annular volume of the guide vane outlet, and the water outlet channel has a smaller hydraulic loss. In the front-mounted scheme, the water flow inside the outlet channel squeezes to the outer wall, causing higher entropy production near the outer wall area. The entropy production of the rear-mounted scheme is mainly in the bulb section and the bulb support. This research can provide reference for the design and form selection of a submersible tubular pump device, which has great engineering significance.

中文翻译：

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球泡位置对潜水管泵装置水力性能的影响

为了研究球泡位置对水力性能的影响
潜水管式泵装置，以大型泵站为基础，设计了前装灯泡和后装灯泡两种方案。前装方案采用GL-2008-03水力模型及其常规导叶，后装方案采用扩压器叶片优化设计。采用数值模拟与实验测试相结合的方法，分析了两种方案的内外特性差异。结果表明，在扩散导叶设计合理的情况下，后置方案的效率高于前置方案，最高效率相差1%左右。虽然前置灯泡方案减少了灯泡部分的水力损失，将灯泡放置在进水侧降低了叶轮的流动条件。受导叶出口环流的影响，出口通道的水力损失比后装方案大。灯泡后置时起整流作用，大大消除了导叶出口的环形容积，出水通道水力损失更小。在前置方案中，出水通道内的水流挤压到外壁，导致外壁区域附近产生更高的熵。后装方案的熵产生主要在灯泡部分和灯泡支架。本研究可为潜水管式泵装置的设计和形式选择提供参考，具有重要的工程意义。