Numerical analysis of controlling separation in axial cascades by excitation of periodical incoming wake

• Autorzy: Liu F. , Wang J. , Wu K.
• Języki publikacji: EN

Abstrakty

EN

Numerical analysis has been performed of time-space structures in a large turning angle axial cascade subject to unsteady incoming wake excitation. The results have shown that intentional unsteady excitation could increase the cascade's time-averaged performance. As a result, the vortex structures corresponding to the external exciting frequency are strengthened and other disordered vortices are involved, so that the separation structures of the suction surface are translated from disorder to order. Two interaction regimes between incoming periodic wakes and separation structures are analyzed, indicating that turbulent kinetic energy can enhance momentum interchange and that wave-vortex resonance can promote rolled-up and plus-minus pairing of vortices. Based .on these, responses of separation structures from two periodic incoming wake regimes are compared. The feasibility of far-field noise reduction in ducting fans by using periodic incoming wake is considered.

Słowa kluczowe

EN

unsteady excitation; compressor cascade; separation control; incoming wake; vortex shedding

• Wydawca: Politechnika Gdańska
• Czasopismo: TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
• Rocznik: 2008
• Tom: Vol. 12, No 1-2
• Strony: 21--34
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Liu F.

autor

Wang J.

autor

Wu K.

• School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P. R. China,

Bibliografia

• [1] Saric S, Jakirlic S and Tropea C 2005 ASME J. Fluids Engng 127 (5) 879
• [2] Pack L G and Seifert A 2000 Dynamics of Active Separation Control at High Reynolds Numbers, AIAA Paper 2000-0409
• [3] Tong B G, Zhang B X and Cui E J 1993 Unsteady Flow and Vortex Motion, Beijing (in Chinese)
• [4] Zheng X Q, Zhou X B and Zhou S 2005 ASME J. Turbomachinery 127 (3) 489
• [5] Chun S, Liu Y Z and Sung H J 2007 J. Fluids and Structures 23 85
• [6] Schobeiri M T and Oztiirk B 2007 ASME J. Turbomachinery 129 (1) 92
• [7] Zheng X Q, Hou A P and Zhou S 2003 Acta Mechanica Sinica 35 (5) 599 (in Chinese)
• [8] Hilgenfeld L and Pfitzner M 2004 ASME J. Turbomachinery 126 (4) 493
• [9] Saha A K and Acharya S 2005 ASME J. Turbomachinery 127 (2) 310
• [10] Song Y P, Chen F, Y ang J and Wang Z 2006 ASME J. Turbomachinery 128 (2) 357
• [11] Bbadebo S A, Cumpsty N A and Hynes T P 2005 ASME J. Turbomachinery; 127 (2) 331
• [12] Chun S and Sung H J 2002 Experiments in Fluids 32 269
• [13] Wang Q H, Wang N, Yu D Z and Tang Y H 1999 Chinese J. Engng Thermophysics 20 (1) 41 (in Chinese)