布置方式对U型管不稳定性的影响

The Influence on Instabilities of U type Tube with Different Placement

从实验和理论两方面研究了不同布置方式对加热Ｕ型管不稳定性的影响。实验在氟利昂－１１３试验台上进行，研究了不同布置Ｕ型管在三种压力工况，六种加热工况及各种流量下的流动不稳定性。理论研究得出了系统稳定性的判据，比较了不同布置方式Ｕ型管的脉动起始边界；并对实际工业现场的Ｕ型管布置方式进行了模拟数值计算。

This paper studied the influence on instabilities of U type tube with different placement experimentally and theoretically. Experiments were carried out on the Freon 113 modeling setup. Flow instabilities under three pressure conditions, six heat inputs and varions mass flow rates were investigated. The Laws law was employed to determine the P.D.O thresholds and the thresholds of U type tube with different placement were comparied. Numerical method was used to calculate the U type tube used in the practical engineering application and the thresholds of U type tube with different placement in the higher system pressure were also comparied.