| 摘要 |
<p>PURPOSE:To prevent occurrence of surging at the time of low flow-rate operation of a centrifugal compressor, by arranging annular cascades in two stages so that fluid is passed through an inner cascade or both of the inner and the outer cascades. CONSTITUTION:Since an inner, annular cascade 20 is designed to suit the low flow-rate operation of a centrifugal compressor, it is operated normally as a diffuser when the flow rate of fluid is low. On the other hand, an outer, annular cascade 23 does not always operate normally as a diffuser under the state that the flow rate of fluid is low. However, since the inner cascade 20 always operates normally as a diffuser, there is no fear of the compressor to cause surging.</p> |
