气体涡轮流量计后导流体结构优化设计

Structure optimization design of rear deflector for gas turbine flowmeter

通过数值模拟和实验测试相结合的方法,研究了LWQ80气体涡轮流量计后导流体的结构优化及其计量性能的变化规律。基于流量计内部流场特征及其流动机理的探究,分析得出造成后导流体压损的主要原因是后导流体区域的壁面边界层分离和流体流向偏转。由此提出了缩小分离区和提升导流片导流效果的优化思路,通过延长后导流体的长度和延后导流片的位置,设计了一种改进型的后导流体结构。研究结果表明:后导流体结构经过改进后,气体涡轮流量计的计量性能得到了明显提升。在流量为250 m^(3)/h时流量计的压损降低了20.5%左右,仪表系数的恒定性显著提高,最大示值误差降低了近2.5倍,且能有效延长流量计的使用寿命。研究结果有助于为气体涡轮流量计的结构与性能优化提供理论指导和技术支持。

By combining experimental and numerical simulation methods,the structural optimization of the rear deflector for LWQ80 gas turbine flowmeter and the variation law of its metering performance is studied in this article.Based on the investigation of the internal flow field characteristics and flow mechanism of turbine flowmeter,it is found that the separation of boundary layer and the deflection of flow direction are two main causes which influence the pressure loss of the rear deflector.Based on this,the optimization idea of reducing the separation area and improving the diversion effect of the deflector is proposed.An improved structure of rear deflector is designed by extending the length of the rear deflector and posting the position of the deflector.Results show that it is equipped with the selected deflector that the comprehensive performance of the flowmeter is obviously improved.At the detection point of 250m^(3)/h,the pressure loss is reduced by 20.5%,the constancy of the instrument coefficient is significantly improved,the maximum indication error is reduced by nearly 2.5 times,and the service life of the flowmeter can be effectively prolonged.Research results are helpful to provide theoretical guidance and technical support for the structure and performance optimization of the gas turbine flowmeter.