采用流场分析提高涡轮流量传感器性能的研究

Research on improving the performance of liquid turbine flow sensor with flow field analysis

以10 mm口径液体涡轮流量传感器为研究对象,经过对传感器内部流场进行分析,提出通过减小靠近叶片顶端的叶片受力面积,提高传感器测量性能的方法。从对特性曲线的分析出发,结合传感器数学模型,提出了一种利用不同流量点的仪表系数平方差Δ(K^2)评价传感器性能的方法。在此基础上,结合CFD仿真和传感器样机实验测试,研究了不同叶轮叶片形状参数对传感器性能的影响。实验结果表明:改变叶轮叶片形状能有效提高传感器的测量性能,切角参数为0.25时,传感器性能最优;此方法同样适用于其他口径涡轮流量传感器结构的优化。

Taking the liquid turbine flow sensor with diameter of 10 mm as the research object,the sensor internal flow field is analyzed;a method is proposed,which can improve the measurement performance of the sensor through reducing the blade area near the top of the blade. Starting from analyzing the sensor characteristic curve,combing with the sensor mathematical model,a turbine flow sensor performance evaluation method is proposed,which uses the square difference of meter coefficients at different flow rates to evaluate the sensor performance. Based on above,combining with Computational Fluid Dynamics（ CFD） simulation and sensor prototype experiment test,the influence of different blade shape parameters on the performance of the sensor is investigated. The experiment results show that changing the shape of the impeller blade can improve the performance of the sensor effectively; and the linearity error reaches optimum when the blade shape parameter equals 0. 25. This method also can be applied to the structure optimization of the turbine flow sensors with other calibers.