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Effect of system response on partial surge initiated instability in a transonic axial flow compressor

Chinese Journal of Aeronautics 2022年第2期35卷 117-127页

作者： Tianyu PAN Zhaoqi YAN Dakun SUN Simin LI Mengzong ZHENG Qiushi LI Reserach Institute of Aero-Engine Beihang UniversityBeijing 100083China School of Energy and Power Engineering Beihang UniversityBeijing 100083China Key Laboratory of Fluid and Power Machinery Ministry of EducationXihua UniversityChengdu 610039China

Partial surge is a type of instability inception in transonic compressors and occurs in the form of axisymmetric low-frequency disturbances localized in the hub *** studies illustrate that the frequency of partial surge is set by the Helmholtz frequency of the entire system,which motivates to propose a hypothesis that the system response performs an important role in the formation of partial *** further verification,a series of experiments are conducted to explore the link between the propagating of the partial surge and the system feedback in this *** the first case,an additional test point is set on the wall of the plenum to detect the system *** the flow behaviors inside the plenum with the disturbances in the rotor tip and stator hub/tip regions,the effects of the system feedback on the occurrence of the continuous disturbances and the rotating stall cells are *** the second case,a screen is mounted at the compressor outlet to prevent positive feedback from the *** experimental results demonstrate that in the absence of system feedback,it is the occurrence of spike-type stall inception that leads to the flow instability instead of that of partial *** addition,three flow phenomena in the second case are discussed,including the occurrence of the single pulse,the unstable process during the stall evolution and the switch of instability inception.

关键词： Partial surge Plenum amplification Rotating stall system response Stall inception Transonic compressor

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Transition to Phase Synchronization Through Generalized Synchronization

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Chinese Physics Letters 2003年第7期20卷 999-1002页

作者：何岱海张廷宪高建郑志刚 DepartmentofMathematicsandStatistics mcMasteruniversityHamiltonL8S4K1Canada DepartmentofPhysics BeijingnormalUniversityBeijing100875 DepartmentofPhysics QujingNormalCollegeQujing655000 DepartmentofPhysics BeijingnormalUniversityBeijing100875

Synchronization in drive-response chaotic systems is studied. For a small mismatch of the natural frequency of the drive and response oscillators, phase synchronization comes before generalized synchronization. For moderate and even large parameter misfits, generalized synchronization can be achieved before phase synchronization. The mechanism of these two different bifurcations is interpreted in terms of the local-minimal-fluctuation method. It is found that the qualitative changes of local-minimal-fluctuations of the response system well manifests the appearance of generalized synchronization.

关键词： phase synchronization Natural frequencies system response

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