以超低温蝶阀为研究对象、LNG液化天然气（Liquefied Natural Gas，LNG）为流体工质，利用Solidworks软件对蝶板的结构尺寸进行参数化处理。基于计算流体力学数值模拟技术，利用Ansys软件对蝶阀开展流-热-固单向耦合计算分析，计算90°~10°不同蝶阀开度下蝶板的流量系数，及蝶阀开度10°下不同蝶板结构参数对蝶阀流通性能、蝶板位移及应力行为的影响。计算结果表明：减小蝶板厚度可以显著增强蝶阀的流通性能，降低蝶板所受最大应力；降低轴颈厚度对蝶阀流通性能提升效果较弱，但可以有效降低蝶板所受最大应力。

Taking the ultralow temperature butterfly valves as the research object and liquefied natural gas (LNG) as the fluid working medium, the parameterization processing of structure size of butterfly plate was carried out by using Solidworks software. Based on computational fluid dynamics numerical simulation technology, the fluidheatsolid unidirectional coupling calculation analysis of butterfly valves was performed by using Ansys software, the flow coefficient of the butterfly plate under different butterfly valve opening of 90° - 10° was calculated, and the effects of different butterfly plate structure parameters on the butterfly valve circulation performance, the butterfly plate displacement and stress behavior under butterfly valve opening of 10° were analyzed. The calculation results show that reducing the butterfly plate thickness can significantly enhance the flow performance of the butterfly valve, and reduce the maximum stress on the butterfly plate; decreasing the journal thickness has a weaker effect on improving the flow performance of butterfly valves, but it can effectively reduce the maximum stress on the butterfly plate.

TH137