流场中轻浮颗粒下拉方式数值模拟与对比分析

基于Fluent软件,采用VOF和DPM模型对振动混合器和叶轮搅拌器中轻浮颗粒的分散过程进行数值模拟,分析了颗粒分散效果的影响因素。结果表明,与叶轮搅拌相比,振动混合器在相同离底间隙的条件下,轻浮颗粒的下拉效果更好,消耗功率更少。

Hybrid Operation of Fault Current Limiter and Thyristor Controlled Braking Resistor

The effectiveness of a combination of fault current limiter and thyristor controlled braking resistor on power system stability enhancement and damping turbine shaft torsional oscillations has been studied. If both devices operate at the same bus, the stabilization control scheme can be carried out continuously and with flexibility. As a result, the fault currents are limited, and the generator disturbances and the turbine shaft torsional oscillations are converged quickly. In this paper, the effectiveness of the combination of both devices has been demonstrated by considering 3LG （three-lines-to-ground） fault in a two-machine infinite bus system. Also, temperature rise effect of both devices with various resistance values and weights has been demonstrated. Simulation results indicate a significant power system stability enhancement and damping turbine shaft torsional oscillations as well as with allowable temperature rise.