气体涡轮流量计性能优化的模拟与实验研究

以TRZ80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，提出了前整流器和后导流体的结构优化方案。通过对结构优化前后流量内部流场特征的分析，揭示了流量计结构与性能优化背后确切的流体力学机制。研究结果表明：前整流器和后导流体区域的压降突变与后导流体尾部的涡旋结构和回流现象是影响流量计计量性能的主要机制。优化的流量计结构可以明显减弱压降突变、涡旋结构与回流现象。优化的流量计结构既可以显著降低流量计的压力损失，又可以明显提高流量计的测量精度与稳定性，其压力损失和线性度误差分别降低了约48.58%和32.43%。研究结果有助于为今后开发与量产计量性能更好的气体涡轮流量计提供理论指导和技术支持。

Study on performance optimization of gas turbine flowmeter by numerical simulation and experimental measurement

Taking TRZ80 gas turbine flowmeter as the research object, the structural optimization scheme of the front rectifier and the rear deflector is proposed by combining numerical simulation and experimental test. Through the analysis of the internal flow field characteristics before and after structural optimization, the exact hydrodynamic mechanism behind the structure and performance optimization of flowmeter is revealed. Research results show that the sudden change of pressure drop in the front rectifier and rear deflector area, as well as the vortex structure and reflux phenomenon at the rear deflector tail, are the main mechanisms that affect the metering performance of the flowmeter. The optimized structure can greatly reduce the sudden change of pressure drop, vortex structure and reflux phenomenon. In addition, the optimized structure can significantly reduce the pressure loss of the flowmeter. And it can also obviously improve the measurement accuracy and stability of the flowmeter. The pressure loss and linearity error are reduced by about 48. 58% and 32. 43% , respectively. Research results could help to provide theoretical guidance and technical support for the development and mass production of gas turbine flowmeter with better metering performance in the future.