Abstract
In order to control and suppress rotating stall in a vaneless diffuser of centrifugal turbomachine, a new passive device by use of radial shallow grooves is proposed and the effect is studied experimentally and theoretically. The results show that the radial grooves of 3 mm depth suppress rotating stall completely over the all flow ranges. The radial grooves of only 1 mm depth on both sidewalls can also suppress rotating stall : Theoretical considerations have revealed that this remarkable effect of radial grooves is caused by the following two mechanisms ; one is a significant decrease in tangential velocity due to the mixing between the main flow and the groove flow, and the other is an increase in radial velocity due to the reverse flow in the grooves.
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