低温推进剂交叉输送管路流场特性仿真研究

Simulation Research on Flow Characteristics of Cryogenic Propellant Cross Feed Pipeline

为分析在双隔离阀关阀过程中不同管路布置对芯级侧隔离阀后的流场产生的波动问题,利用Flow simulation软件模拟分析了阀门间距、阀门口径以及阀门压差对介质为液氧的交叉输送管路流场特性的影响。结果表明:使用双蝶阀的输送管路的阀门间距对芯级侧管路基本没有影响,并且其关阀角度较小时的调节能力要强于其在较大关阀角度的调节能力;当其他条件相同,随着阀门口径的增大,芯级侧隔离阀后流量变化有显著差异;此外,在给定交叉输送管路几何尺寸大小的情况下,压差变化时,管路流场参数的控制策略需要进行相应调整。

To analyze the fluctuation of flow field behind the core stage isolation valve caused by the different pipeline layout in the closing process of double isolation valve,the effects of the valve installation distance,the valve diameter and the valve pressure difference on the flow characteristics of the cross feed pipeline performed with liquid oxygen were simulated and analyzed with Flow simulation software.The results showed that the valve installation distance of the feed pipeline with the double butterfly valves had little influence on the core stage pipeline,meanwhile the regulating capacity of valves at small closing angle was better than that of the valve at large closing angle.When the other conditions were constant,the change of flowrate after the core stage isolation valve was significantly different with the increase of the valve diameter.In addition,at the given geometric size of the cross feed pipeline,the control strategy of the flow field parameters of the pipeline should be adjusted accordingly when the valve pressure difference changed.