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一种计算诱导轮扬程曲线的方法

发表时间:2011-02-28  浏览量:1464  下载量:676
全部作者: 李文广
作者单位: 兰州理工大学能源与动力工程学院
摘 要: 提出了采用奇点法计算诱导轮扬程的方案。首先,在若干圆柱形流面上采用奇点法计算理想流体流过叶栅时叶栅产生的理论扬程,进而求出诱导轮产生的平均理论扬程,然后从平均理论扬程中减去由经验公式计算的水力损失,得到诱导轮实际扬程。在经验公式中引入一个与诱导轮几何形状相关的修正系数。利用现有的17诱导轮的性能试验数据对该方法进行验证,并给出水力损失系数修正系数与叶片数和平均叶片角的曲线。与现有的经验公式法、径向平衡方程法和滑移修正的Euler方程法相比,所研究方法的计算结果更接近试验值,提出的诱导轮扬程的预测方法是有效和可行的。
关 键 词: 流体机械及流体动力工程;诱导轮;扬程;预测;奇点法;水力损失
Title: An approach for estimating head curve of noncavitating inducers
Author: LI Wenguang
Organization: School of Energy and Power Engineering, Lanzhou University of Technology
Abstract: In this paper, a proposal was suggested where a singularity method was utilized to estimate the head of noncavitating inducers. Initially, the theoretical heads developed by the annular cascades on several cylindrical stream surfaces in an inducer against an ideal fluid through the cascades were calculated by using the singularity method; then an averaged theoretical head was established with those heads. Secondly, a hydraulic loss, which was estimated using an empirical equation, was subtracted from the averaged theoretical head, causing an actual head generated by the inducer. A geometrically dependent correction factor was involved in the empirical equation in the method. The method was validated by using experimental data of head-flow rate curve of the existing 17 inducers found in references. Moreover, the curves showing the relation among the correction factor and the number of blades as well as the mean angle of blade were demonstrated. Compared to the existing empirical equation method, radial equilibrium equation approach and Euler equation of turbomachinery with slip correction, the current method can achieve better agreement with experimental observations. This suggested that the approach proposed in the paper is effective and feasible.
Key words: fluid machinery and fluid power engineering; inducer; head; prediction; singularity method; hydraulic loss
发表期数: 2011年2月第4期
引用格式: 李文广. 一种计算诱导轮扬程曲线的方法[J]. 中国科技论文在线精品论文,2011,4(4):358-365.
 
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