| 摘要 |
<p>PURPOSE: To provide an improved centrifugal compressor capable of stable operation in a broad operation range and with a high efficiency without generation of flow separation at a tip of an impeller. CONSTITUTION: A pipe diffuser 11 is used in a centrifugal compressor in order to obtain high efficiency and a broad operating range. The number of channels 31 in the pipe diffuser 11 is limited such that a wedge angle is relatively large and therefore not susceptible to flow separation at leading edges thereof. A vaneless space between an impeller 12 and a leading edge circle of the diffuser 11 is limited in its radial depth such that the flow separations are further inhibited. Further, the impeller 12 has a relatively great backsweep, thereby reducing influents under lower flow conditions.</p> |
