流量法测量文丘里管流量系数的误差研究

Research on Errors of Flow Coefficient by Flow Measurement in Venturi Tube

主要探讨在文丘里管测量流量系数实验中流量系数取值过程中的误差,借用能量方程,推导出了考虑水头损失时流量系数的理论公式,通过实验比较分析了不同阻力系数下计算得出的流量系数的误差大小,提出了在Re<105时一种简化流量系数取值过程的计算方法,并验证了其可靠性。另外通过比较在同一水流环境下两次不同流量计算得到的流量系数,分析了流量测量引起的误差对于流量系数取值的影响。

This paper mainly discussed the Venturi Tube measure flow coefficient in the experiment, the range of error of values in the process of acquiring. This paper gave the analysis of energy equation, getting a theoretical formula of discharge coefficient, comparing the size of error of flow coefficient under different drag coefficient, obtaining a good way to calculate flow coefficient in the Re〈10s, verifying its rationality. In addition, this paper mainly compared the value of two different flow coefficients that depends on two different measurements under the same water environment in the experiment of measuring flow coefficient in Venturi Tube, analyzing the influence of flow coefficient values due to the error of flow measurement