脉动流场中旋进旋涡流量计流体振动特性的实验研究

An Experimental Study of the Dynamic Characteristics of Swirlmeter in Oscillatory Flow

研究了脉动流场中旋进旋涡流量计流体振动特性。在自行设计的实验装置中使用压电式压力传感器对50mm口径的旋进旋涡流量计在脉动干扰流场中的流体振动特性进行试验研究,明确了流体脉动对旋进旋涡效应的影响因素。实验研究表明,流体脉动干扰与旋进旋涡效应的脉动压力为线性叠加关系;流体脉动干扰的能量耗散作用将导致旋进旋涡效应的衰减,从而扩展旋进旋涡流量计测量的下限。并提出了新的设计,以利用对称脉动压力信号差分处理和改善测量系统的电磁屏蔽性能来减弱流场波动对该类流量计的影响。

Dynamic characteristics of swirlmeter in oscillatory flow is investigated. A 50 mm prototype swirlmeter is designed,and experimental study of characteristics of swirlmeter in oscillatory flow and steady flow is performed. The velocity pressure signals of vortex precession in swirlmeter are obtained by using two axisymmetrical setting piezoelectric press sensors. The influent factors of fluid oscillatory on swirlmeter are ascertained. Major findings in experiment are as follows: firstly, the correlation between the velocity pressures of fluid disturbs wave and velocity pressure of vortex precession in swirlmeter is linear. And secondly, the energy dissipation phenomena of fluid disturb lead to attenuate the vortex precession and extend the lower limit of swirlmeter. By using differential symmetry velocity pressure signals and improving electromagnetism shield of the measuring system, the effect of fluid oscillation on swirlmeter will be reduced.