Effect of Inlet and Riser Sections on Two-Phase Flow Instability under Rolling
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摘要: 本文对摇摆状态下并联多通道系统的两相流动不稳定性进行了初步研究。重点讨论了在摇摆状态下的并联通道入口段和上升段对管间脉动不稳定性的影响。以均匀流模型为基础,采用控制容积积分法建立了并联多通道的分析模型并建立系统方程组,同时考虑了摇摆状态的影响。用吉尔方法对系统方程组进行求解,得到了并联多通道系统在摇摆状态下的不稳定边界。发现在一定的摇摆状态下两相流动不稳定区域会同时出现在低含汽和高含汽两个区域,在高含汽率区域某些工况下会出现倍周期现象。Abstract: In this paper the two-phase flow instability of parallel channels system is studied under ocean conditions. The effect of inlet and riser sections under rolling motion is analyzed detailed. The parallel channel model based on the homogeneous flow model and the system equations are built by using control volume integrating method. The rolling motion model is also included. Gear method is used to solve the equations. The instability boundary under ocean condition is obtained. It is found that the instable regions occur both in low and high equilibrium quality regions. In high equilibrium quality the period-doubling phenomena are found.
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Key words:
- Rolling /
- Inlet section /
- Rise section /
- Two-phase flow /
- Instability /
- Oscillation between pipes
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