Using splitter blades to improve suction performance of centrifugal impeller pumps
Using splitter blades to improve suction performance of centrifugal impeller pumps
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DOI：
10.1177/0957650914563364
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
G. Cavazzini;G. Pavesi;A. Santolin;G. Ardizzon;R. Lorenzi
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文献类型：
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作者：
G. Cavazzini;G. Pavesi;A. Santolin;G. Ardizzon;R. Lorenzi
通过实验试验和数值分析，比较了带和不带分流叶的离心叶轮泵的吸力性能。两种泵的设计都是在保持叶轮子午形状、叶片数量和蜗壳壳的基础上进行的。采用一维反设计方法得到叶片形状。假设两个叶轮的全叶片载荷分布相同，而对分流叶片的载荷分布进行了修改，直到两个扬程-容量曲线接近匹配。为了准确地描述分离器叶片在空化开始和发展过程中所起的作用，需要满足这一性能要求并使用相同数量的叶片。与其他实验比较不同的是，在不满足先前要求的情况下，在大流量下发现吸力性能有明显的改善，而在部分流量下则没有，在部分流量下观察到吸力性能有轻微的恶化。研究了叶片厚度阻塞对全叶片前缘入射角的影响。
A comparison between centrifugal impeller pumps with and without splitter blades in terms of suction performance is presented by experimental tests and numerical analyses. The design of both pumps was carried out by preserving the impeller meridional shape, number of blades, and volute casing. Blade shapes were obtained by adopting a 1D inverse design method. The same blade loading distribution was assumed for the full blades of both impellers, while the loading distribution of the splitter blades was modified until a close matching between the two head-capacity curves was achieved. The fulfilment of this performance requirement and the use of the same number of blades were needed to describe accurately the role played by the splitter blades in cavitation inception and development. Differently from other experimental comparisons, where previous requirements were not met, a noticeable improvement in suction performance was found at large flow rates but not at partial ones, where a small deterioration in suction performance was observed. The crucial role played by the blade thickness blockage on the incidence flow angle at the leading edge of the full blades was also investigated.