文丘里定风量阀的实验研究

通过对文丘里定风量阀阀芯所受的绕流阻力进行理论研究,发现绕流阻力系数是描述文丘里定风量阀阀芯在运行过程中所受绕流阻力的关键因素,进而设计了实验装置,对绕流阻力系数进行实验研究。通过对不同阀体收缩角度、不同阀芯位置的绕流阻力及绕流阻力系数的实验研究,得出了如下结论:绕流阻力系数与当量直径呈良好的幂函数关系;绕流阻力系数随当量直径的增大而减小,且随着收缩角的增大,绕流阻力系数的变化幅度增大,并且在同一位置不同风量下绕流阻力系数基本保持不变。

Research on constant air volume valve of Venturi

By studying the flow resistance of valve core of Venturi constant air volume, the paper discovered that the flow resistance coefficient is the key factor to describe the flow resistance in the operation process of the venturi constant air volume valve core. Therefore,the paper designed the experiment device so as to study the flow resistance coefficient. Through studying the flow resistance and the flow resistance coefficient with different body contraction angles or different valve core positions, it obtained the following conclusions that the flow resistance coefficient and the equivalent diameter express a good power function; the flow resistance coefficient decreases with the increase of equivalent diameter,and the variation extent of flow resistance coefficient increases with the increase of various shrinkage angle.The flow resistance coefficient basically keeps constant under different air volumes of the same position.