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Yu W.-Y.,Inner Mongolia University of Technology | Tian R.,Inner Mongolia University of Technology | Tian R.,Inner Mongolia Autonomous Region Key Laboratory of Renewable Energy | Yan S.-Y.,Inner Mongolia University of Technology | Yan S.-Y.,Inner Mongolia Autonomous Region Key Laboratory of Renewable Energy
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2012

In this paper, Fluent is employed to investigate the flow structure and performance of the steam ejector. Effect of the operating pressure on the entrainment ratio and flow structure of the ejector is discussed. For a given ejector, there exists an optimum primary fluid pressure at which maximum entrainment ratio is obtained. Entrainment ratio is increased by increasing the secondary fluid pressure and decreasing the discharge pressure.

Wang J.-W.,Inner Mongolia University of Technology | Wang J.-W.,Inner Mongolia Autonomous Region Key Laboratory of Renewable Energy | Bai Y.,Inner Mongolia University of Technology | Gao Z.-Y.,Inner Mongolia University of Technology | And 5 more authors.
Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology | Year: 2010

To resolve the noise problem in rotor blade-tip near-wake region of small windmill, the noise radiation of near-wake acoustic field in the rotor blade-tip downstream of windmill was measured based on BSWA VS302USB noise vibration acquisition and analysis system over a range of tip speed ratios at the open experiment segment of wind tunnel. The noise pressure and spectrum in the blade-tip downstream were analyzed. The experimental results show that the noise radiation spectrum of rotor blade-tip is composed of the broadband noise superposed by the discrete noise from fundamental frequency and its harmonic in the rotating process of the rotor. The discrete rotation noise is dominant in total noise level. The tip vortex and adhesion vortex appear in the blade-tip airfoil trailing-edge downstream, which can offer the greater disturbance on the flow field in rotor blade tip. The high pressure pulsation region forms around the blade, and the strongest part of sound pressure level is near the downstream region of blade-tip.

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