Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 13, 2024 - March 14, 2024
The impeller stall inception in a transonic centrifugal compressor with bleed slots was investigated by the experiments and the unsteady numerical analysis. Both the experimental and CFD results showed that the impeller stall inception occurred first at the leading edge of the splitter blade before that of the main blade. Then, the numerical results revealed also that the blockage development of both pressure and suction side passage of the splitter blade was the main cause of the stall inception. The blockage development within the pressure side was caused by the expansion of the stagnation region, following the development of suction side due to the leading-edge separation. It is because the low momentum fluid was no longer discharged due to the decreasing of bleed air at the inlet of pressure side passage, while the increasing at the inlet of suction side passage. Therefore, while bleed air restrained the blockage development within the suction side passage, it induced the blockage development within the pressure side passage, which affected impeller stall inception.
