Performance simulation and experiment of different leading edge back-swept angle on double blade sewage pump

Q2 Agricultural and Biological Sciences 农业工程学报 Pub Date : 2014-01-01 DOI:10.3969/J.ISSN.1002-6819.2014.19.006
Ke Chen, W. Shi, Desheng Zhang, T. Lang, Cheng Cheng
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引用次数: 1

Abstract

The back-swept double blade sewage pump studied in the paper belongs to the new high efficiency non-clogging pump. It has a self-cleaning ability, and can effectively solve the problem of fiber winding and congestion. This research study designed to probe the effect of the leading edge back-swept angle on a forward-extended double blade sewage pump. By changing the leading edge shape to get different degrees of back-swept blade, four models of impellers with different back-swept angles of 60°, 100°, 140°, and 180° were created by BladeGen. According to the structure of the pump, we divided the fluid domain into six parts, namely entrance region, impeller, volute, front chamber, back chamber, and outlet section, which were modeled by Unigraphics NX. ICEM CFD software was used for dividing the structured mesh of each part, and the numerical simulation of the whole flow field was performed based on a standard k-E turbulence model and scalable wall function. The total pressure inlet condition and mass flow rate outlet condition were adopted in the computational domains. The impeller was defined as rotating domain with a speed of 1 450 r/min. Both front and back of the pump cover plate walls were set to the rotating walls with the speed of 1 450 r/min. Other domains and walls were defined as static fields or walls. The discrete control equations were based on the finite element of finite volume method. The convective term was a high resolution format and convergence precision was set to 10-4. At the same time, the trend of the pump head, efficiency, and power curves were leveling out to ensure the credibility of the calculation results. To further ensure the accuracy of the simulation results, a sewage pump of 100° back-swept angle was produced and tested. Comparison between the numerical simulation and experimental results was presented to prove the accuracy of the numerical simulation. Comparing performance curves concluded from the simulation, we found that the best efficiency point of pump shifts to the high flow condition and the required shaft power increases when the back-swept angle increases from 60° to 140°, and the best efficiency point of the pump apparently decreased when the back-swept angle increased from 140° to 180°. To probe the cause of the efficiency decrease, we did an analysis of the internal flow field when the flow ratio Q/Qn was 1.2, and found that, with the back-swept angle β increases, the value and range of turbulent kinetic energy had a sharp increase in the impeller inlet, namely, the hydraulic loss appeared in the inlet. Therefore, by further analysis of the leading edge in axial velocity distribution, it can be known that there are refluxes at the leading edge near the front shroud, which causes large hydraulic losses. And with the back-swept angle increasing, the flow passage near the outer periphery was much narrower, causing the region of reflux to become larger. So it was suggested that the back-swept angle of the leading edge should not more than 140°, otherwise the efficiency of the pump would apparently decrease. The results are instructive for the design and optimization of a forward-extended double blade sewage pump.
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双叶片污水泵不同前缘后掠角性能仿真与实验
本文研究的后掠式双叶片排污泵属于新型高效不堵塞泵。具有自清洁能力,能有效解决纤维缠绕和堵塞问题。本研究旨在探讨前缘后掠角对前伸式双叶片污水泵的影响。通过改变前缘形状获得不同程度的后掠叶片,BladeGen设计了后掠角分别为60°、100°、140°和180°的四种叶轮型号。根据泵的结构,将流体域划分为入口区、叶轮区、蜗壳区、前室区、后室区和出口区6个部分,并利用Unigraphics NX进行建模。采用ICEM CFD软件对各部分进行结构化网格划分,基于标准k-E湍流模型和可扩展壁面函数对整个流场进行数值模拟。计算域采用总压进口条件和质量流量出口条件。将叶轮定义为转速为1450 r/min的旋转区域。泵盖板前后壁均设为旋转壁,转速为1450 r/min。其他域和墙被定义为静态场或墙。离散控制方程基于有限体积法的有限元。对流项为高分辨率格式,辐合精度设为10-4。同时,对泵扬程、效率、功率曲线的变化趋势进行了调平,保证了计算结果的可靠性。为了进一步保证仿真结果的准确性,制作了一个100°后掠角的污水泵并进行了试验。通过数值模拟与实验结果的比较,验证了数值模拟的准确性。对比仿真所得的性能曲线,发现当后向角从60°增加到140°时,泵的最佳效率点转向大流量工况,所需轴功率增加,当后向角从140°增加到180°时,泵的最佳效率点明显下降。为了探究效率下降的原因,对流量比Q/Qn为1.2时的叶轮内部流场进行了分析,发现随着后掠角β的增大,叶轮进口湍流动能的值和范围急剧增大,即在进口出现了水力损失。因此,通过进一步分析前缘轴向速度分布可知,前缘靠近前叶冠处存在回流,造成较大的水力损失。随着后掠角的增大,靠近外周的流动通道变窄,导致回流区域变大。因此建议前缘后掠角不宜大于140°,否则泵的效率会明显下降。研究结果对前伸式双叶片污水泵的设计和优化具有指导意义。
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来源期刊
农业工程学报
农业工程学报 Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)
CiteScore
4.10
自引率
0.00%
发文量
19555
期刊介绍: TCSAE, the "Transactions of the Chinese Society of Agricultural Engineering," serves as a platform to introduce the latest scientific achievements and developing trends primarily in the field of Agricultural Engineering (AE) in China and, to some extent, from abroad. It encompasses eight disciplines, including Comprehensive Research, Key Technology, Soil and Water Engineering, Agricultural Equipment Engineering and Mechanization, Agricultural Aviation Engineering, Agricultural Information and Electrical Technologies, Agricultural Bioenvironmental and Energy Engineering, Land Consolidation and Rehabilitation Engineering, and Agricultural Produce Processing Engineering.
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