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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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Three dimensional unsteady numerical calculations were performed to investigate unsteadiness of the tip leakage flow in an axial compressor. The first stage of the four-stage low-speed research axial compressor was examined. Since this compressor has a relatively large tip clearance, the unsteadiness of the tip leakage flow is induced. Through the results from the unsteady calculations, the process of the induced unsteady tip leakage flow was investigated. It was shown that the leakage flow that occurred at a rotor blade tip clearance affected the pressure distribution on the pressure side near the tip of the adjacent blade, thus caused the fluctuation of the pressure difference between the pressure side and suction side. Consequently, the unsteady tip leakage flow was induced at the adjacent rotor blade. The unsteady feature of the tip leakage flow was changed as the operating point was moved. The interface between the tip leakage flow and the main flow only affected the trailing edge region at the design point whereas the interface influenced up to the leading edge at the low flow rate point. As the flow rate decreased, additionally, it was seen that the vortex size of the tip leakage flow increased and the relatively large length scale disturbance occurred. On the other hand, using frequency analysis, it was shown that the unsteadiness was not associated with the rotor speed and was about 40% of the blade passing frequency. This feature was explained in the rotor relative frame of reference, and the frequency decreased as the flow rate decreased.
목차
ABSTRACT
1. 서론
2. 연구 방법
3. 연구 결과
4. 결론
참고문헌
참고문헌 (8)
참고문헌 신청
1. [학술지(정기간행물)] - Mailach, R / 2001 / Rotating Instabilities in an Axial Compressor Originating from the Fluctuating Blade Tip Vortex / Journal of Turbomachinery 123 : 453 ~ 463
2. [학술지(정기간행물)] - März, J / 2002 / An Experimental and Numerical Investigation Into the Mechanisms of Rotating Instability / Journal of Turbomachinery 124 : 367 ~ 375
3. [학술대회논문] - Hah, C / 2008 / Tip Clearance Vortex Oscillation, Vortex Shedding and Rotating Instability in an Axial Transonic Compressor Rotor / ASME Turbo Expo 2008
4. [학술지(정기간행물)] - Du, J / 2010 / Numerical Investigation on the Self-Induced Unsteadiness in Tip Leakage Flow for a Transonic Fan Rotor / Journal of Turbomachinery 132
5. [학술대회논문] - Kielb, R. E / 2003 / Blade Excitation by Aerodynamic Instabilities- A Compressor Blade Study / ASME Turbo Expo 2003
2. [학술지(정기간행물)] - März, J / 2002 / An Experimental and Numerical Investigation Into the Mechanisms of Rotating Instability / Journal of Turbomachinery 124 : 367 ~ 375
3. [학술대회논문] - Hah, C / 2008 / Tip Clearance Vortex Oscillation, Vortex Shedding and Rotating Instability in an Axial Transonic Compressor Rotor / ASME Turbo Expo 2008
4. [학술지(정기간행물)] - Du, J / 2010 / Numerical Investigation on the Self-Induced Unsteadiness in Tip Leakage Flow for a Transonic Fan Rotor / Journal of Turbomachinery 132
5. [학술대회논문] - Kielb, R. E / 2003 / Blade Excitation by Aerodynamic Instabilities- A Compressor Blade Study / ASME Turbo Expo 2003
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UCI(KEPA) : I410-ECN-0101-2013-554-001507611