涡轮流量传感器特性的试验研究

EXPERIMENTAL STUDY ON THE PERFORMANCE CHARACTERISTIC OF THE TURBINE FLOW SENSOR

在高精度的粘度、流量可调整的柴油流量试验装置和水流量试验装置上,对涡轮流量传感器特性曲线进行了试验研究。发现在不同的传感器个体中和不同特性的被测介质情况下,传感器特性曲线在小流量时均具有“锯齿”形变化,其变化幅度达到±0.5％以上;“锯齿”形特性曲线出现第二个峰值所对应的管道Re,随被测流体特性和传感器的不同而不同。对此现象进行了分析,并对涡轮流量传感器的叶轮进行了受力分析。流体流经叶轮时形成边界层流动。边界层流动型态发生转换时,流体对叶轮的旋转力矩会突然增加,可能是出现“锯齿”形变化的原因。

Experimental study on the performance characteris- tics line of the turbine flow sensor is made, with a high preci- sion experimenta1 facility which can regulate the viscosity and the flow of the diesel oil, and another one for the flow of the water. It is found that a zigzag appears at the performance characteristics line of the different sample of turbine flow sen- sor at low flow rate, even changing the characteristics of the fluid that is measured. The rang of the zigzag variation is great than ±0.5%. But the value of Reynolds number, where the second peak appears, varies when the characteristics of the liquid and the sample of the turbine flow sensor are changed. The analysis of this phenomenon and the stress of the rotor are shown. The boundary layer flow is formed when the fluid passes the turbine flow sensor. The transition of the modes of flow in the boundary layer leads a sudden increase of the driv- ing torque of the rotor.Maybe, this is the reason for the zigzag variation of the line.