跪求中文翻译

Ultrasonic gas flow detection technology in recent years, the field of flow testing a bright spot, in flow measurement plays an increasingly important role in updating its technology very quickly. And the accuracy of the measurement results, stability and adaptability flow of increasingly high demand. From ultrasonic flowmeter principle may lead to the channel length and propagation time these two basic measurement uncertainty The cause analysis, detailed description of the measurement of uncertainty causes; As convection ultrasonic flowmeter market is very sensitive situation, Therefore, it may encounter the ideal and non-ideal typical flowing to conduct a study, pipe flow calculation method, the specific introduction to the finite volume method (FMV), finite volume method in the discrete FLUENT, FLUENT final choice of turbulence model sports the typical turbulent flow field for treatment. Measurement uncertainty can reflect different sources of error of the measurement results, th