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Study of Influence on the Rotor Wake to the Unsteady Separation Structure on Transonic Compressor Stator
Pages: 744-751
Year: Issue:  4
Journal: Journal of Engineering Thermophysics

Keyword:  transonic compressorunsteady simulationrotor wakestatic blade surfaceseparation structure;
Abstract: A numerical simulation was performed to analyze the unsteady effect of the rotor wake to the separation structures on the static blade surface and hub of the transonic compressor under the design condition.Firstly,employing the experimental results of Rotor 37,the reliability of the numerical simulation methods are verified.By the calculation of the transonic compressor under the design condition,the results of the steady and unsteady methods are similar on the whole,but the unsteady calculations consider the effects of rotor wake on stator flow.Study shows that the rotor wake has been stretched,distorted,accumulated and dissipated in the process of transportation.The rotor wake forces the flow angle to be periodical fluctuating at the interface of rotor and stator.Because of the scanning of the rotor wake,the area of the closed separation at the stator leading edge occurs firstly increasing and then decreasing as a periodical fluctuation,and the form of separation at the stator trailing edge transforms from the closed separation to open separation periodically.The scanning of the rotor wake induces out of a small vortex in front of the suction side of the horseshoe vortex,and makes the topological structure of a couple of spiral points at the corner between the root of the stator trailing edge and the hub to be changed periodically.The scanning of the rotor wake makes the area of high hydrostatic pressure at the stator pressure side to occur periodically migration.
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