气体涡轮流量计结构优化研究

以TM80气体涡轮流量计为研究对象，采用数值模拟与实验测试相结合的方法对其进行结构优化研究。数值结果表明压力梯度骤变和边界层分离的出现主要由流量计的表芯支座和后导流体引起。由此提出了关于表芯支座坡度和后导流体直径的结构优化方法，将表芯支座的坡度设计为15°,将表芯支座侧面的台阶流转变成渐缩流；将后导流体直径缩减为62 mm,将后导流体侧面的台阶流转变成等直径的管道流。数值模拟和实验测试证实，当表芯支座坡度设计为15°、后导流体直径设计为62 mm时，流量计的压力损失显著降低，仪表系数变得更加稳定，线性度误差明显变小，说明该结构优化方法可以明显提升流量计的计量性能。研究结论有助于为今后开发性能更好的气体涡轮流量计提供有力的理论指导和技术支持。

Research on structure optimization of the gas turbine flowmeter

In this article, the structure of the TM80 gas turbine flowmeter is optimized by using numerical simulation and experimental test. The numerical simulation results reveal that the sudden change of pressure gradient and boundary layer separation are mainly caused by the core support and rear deflector. Therefore, the structural optimization schemes about the slope of core support and the diameter of rear deflector are proposed. Specifically, the slope of the movement support is designed to be 15°. The step flow on the side of the movement support is transformed into a gradual flow, the diameter of the rear guide fluid is reduced to 62 mm, and the step flow on the side of the rear guide fluid is transformed into a pipe flow of equal diameter. The numerical and experimental results show that when the slope of core support is 15° and the diameter of rear deflector is 62 mm, the pressure loss of the flowmeter is significantly reduced, the instrument coefficient becomes more stable, and the linearity error becomes obviously smaller, which verify that the structural optimization schemes can greatly improve the metering performance of the flowmeter. The research results are helpful to provide theoretical guidance and technical support for the development of gas turbine flowmeter with better performance in the future.