入口旋回流注入法が非接触シールの静及び動特性へ及ぼす影響(J13-5 流体関連振動II,J13 流体関連の騒音と振動)

Abstract

Non-contacting seal is used to prevent leakage flow for turbomachineries, such as gas turbines and compressors. Since these turbomachineries tend to be operated under high pressure and power, the fluid forces induced at the seal is one of the causes of instability. One way to reduce this instability is to use inlet swirl injection against rotation. In this research, we found the distribution of circumferential velocity and pressure at the inlet of the seal and the effect of injection of inlet swirl on the static and dynamic characteristics. We also compared this seal with conventional type seals in order to determine how much the generation of the fluid forces could be reduced.