取压口位置对文丘里管脉动流量测量的影响

为研究通过文丘里管测量周期脉动流量时取压口位置造成的影响,利用FLUENT软件对正弦脉动流下文丘里管内流场进行仿真计算,获得文丘里管在不同脉动频率和幅度下单周期内流量与四组取压口间的差压,并利用四组差压分别计算脉动流量,对计算流量的误差进行比对分析。研究结果表明,文丘里管取压口轴线位置不同,将导致横截面积倒数在取压口之间的积分值不同,进而将影响脉动流量测量误差。

Influence of Pressure Tapping Position on the Measurement of Pulsating Flow by Venturi Tube

In order to study the influence of the position of the pressure intake on the measurement of periodic fluctuating flow through Venturi tube, the flow field of sinusoidal fluctuating flow in the lower venturi tube is simulated by FLUENT software. The differential pressure between the flow rate and four groups of pressure intake in a single cycle under different fluctuating frequencies and amplitudes is obtained. The four groups of differential pressure are used to calculate the fluctuating flow rate separately, which is a mistake in the calculation of flow rate. The differences were compared and analyzed. The results show that the different axis positions of Venturi tube pressure intake will lead to different integral values of reciprocal cross-sectional area between pressure intake, which will affect the measurement error of pulsating flow.