| 摘要 |
PURPOSE:To aim at enlarging stable operating ranges at points other than a design point without lowering the aerdynamic performance at the design point, by moving a movable piece of a fluid control device due to the balance between the differential pressure of the surfaces of high and low pressure stage rotary blades and the recovering force of a holding member so that a flow volume is controlled. CONSTITUTION:When a compressor operates at a high rotational speed approaching a design point, the pressure in the inside chamber 12a of a fluid control device 12 is increased by the pressure downstream of high-pressure stage blades 2' so that the differential pressure between it and a inside chamber 12b increases, thereby a movable piece 14 is moved due to the differential pressure. Then the positions of through-holes 20, 23 are shifted from each other to block passages, causing the control of boundary layer to be stopped. When the rotational speed of the compressor lowers below the design point, the through-holes 20, 23 are aligned together to reinitiate the control of boundary layer. Accordingly, upon stopping of the compressor the movable piece 14 is moved by the recovering force of holding members such as, for example, coil springs 15, 16 in the direction opposite to the direction upon starting. With this arrangement, only upon operation at points other than the design point at which the glowth of the boundary layer is remarkable, the boundary layer control of the surfaces of rotary blades is made, thereby a stable operating range at points other than the design point may be widened without remarkably lowering the aerodynamic performance at the design point.
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