| 摘要 |
A centrifugal compressor includes an impeller, a casing, an impeller housing portion, an inlet port, an annular flow passage provided around the impeller, a discharge port communicated with the annular flow passage, an annular chamber provided around the inlet port, a downstream slot communicating a downstream end of the annular chamber with the impeller housing portion, and an upstream slot communicating an upstream end of the annular chamber with the inlet port. The downstream slot draws a one-cycle curved line pulsating in an axial direction of the inlet port. A most upstream point of the downstream slot is located at an upstream end portion of impeller blades of the impeller when seen along a direction perpendicular to a rotary shaft of the impeller. According to the centrifugal compressor, it becomes possible to expand its operating range by improving a surging restriction effect brought by more effective casing treatment.
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