叶顶间隙对低比转速半开式离心泵性能的影响

发布时间：2018-01-07 07:19

本文关键词：叶顶间隙对低比转速半开式离心泵性能的影响　出处：《浙江理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：泵盖板与叶轮之间的间隙层泄漏是造成低比转速半开式叶轮离心泵性能低的主要原因，因此开展不同叶顶间隙对低比转速半开式叶轮离心泵性能影响的研究具有重要的意义，研究结果为流体机械的高效率、低能耗设计提供重要的理论依据和技术支持。本文以一台低比转速半开式后弯叶轮离心泵为研究对象分析不同叶顶间隙对离心泵性能的影响，包括对四种叶顶间隙下的离心泵整机数值模拟、性能预测以及外特性试验。主要内容如下：（1）借助Pro/E软件对诱导轮、半开式后弯叶轮和蜗壳进行三维建模，利用NUMECA软件中的IGG/AutoGrid模块生成叶顶间隙g=0.6mm、1.2mm、1.8mm和2.4mm下的整机网格；（2）针对圆弧型叶片形式的半开式叶轮离心泵，在四种叶顶间隙下开展泵内全流场计算，，分析不同叶顶间隙对离心泵内部流场及性能的影响规律，分析设计工况下泵内流道内的能量损失，回流、二次流等非稳定流动因素的发生位置和形状；（3）对不同叶顶间隙的半开式圆弧型叶轮离心泵进行外特性试验研究，分析不同间隙对低比转速半开式离心泵的外特性影响，并和数值模拟预测的性能结果进行对比分析，验证本文数值模拟方法的可行性及结果的准确性。
[Abstract]:The leakage of clearance layer between the cover plate and impeller is the main reason for the lower performance of semi-open impeller centrifugal pump with low specific speed. Therefore, it is of great significance to study the effect of different tip clearance on the performance of semi-open impeller centrifugal pump with low specific speed. The result is the high efficiency of fluid machinery. Low energy consumption design provides an important theoretical basis and technical support. In this paper, a low specific speed semi-open back bent impeller centrifugal pump is taken as the research object to analyze the effect of different tip clearance on the performance of centrifugal pump. It includes the numerical simulation, performance prediction and external characteristic test of the centrifugal pump with four kinds of tip clearance. The main contents are as follows: 1) 3D modeling of induction wheel, semi-open rear curved impeller and volute with the help of Pro/E software. Using the IGG/AutoGrid module in the NUMECA software to generate the grid of the machine with the gap of 0.6 mm or 1.2 mm or 1.8 mm and 2.4 mm on the top of the blade; (2) for the semi-open impeller centrifugal pump with circular vane type, the whole flow field calculation is carried out under four kinds of vane clearance, and the influence of different blade top clearance on the flow field and performance of centrifugal pump is analyzed. The position and shape of unstable flow factors, such as energy loss, backflow, secondary flow and so on, are analyzed under design conditions. The external characteristic of semi-open arc impeller centrifugal pump with different blade top clearance is studied and the influence of different clearance on the external characteristic of semi-open centrifugal pump with low specific speed is analyzed. The feasibility and accuracy of the numerical simulation method are verified by comparing and analyzing the performance results predicted by the numerical simulation.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311

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