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Behavior of Rotating Stall Cell in a High Specific-Speed Diagonal Flow Fan
Shiomi, Norimasa,Cai, W.X.,Muraoka, A.,Kaneko, K.,Setoguchi, T. The Korean Society of Mechanical Engineers 2001 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.15 No.12
An experimental investigation was carried out to clarify unsteady flow fields with rotating stall cell, especially behavior of stall cell, in a high specific-speed diagonal flow fan. As its specific-speed is vary high for a diagonal flow fan, its pressure-flow rate curve tends to indicate unstable characteristics caused by rotating stall similar to axial flow fan. Although for an axial flow fan many researchers have investigated such the flow field, for a diagonal flow fan tittle study has been done. In this study, velocity fields at rotor Inlet in a high specific-speed diagonal flow fan were measured by use of a single slant hot-wire probe. These data were processed by using the "Double Phase-Locked Averaging"(DPLA) technique, i. e. phases of both the rotor blade and the stall cell were taken into account. The behaviors of stall cell at rotor inlet were visualized for the meridional, tangential and radial velocity.
S.Muraoka,Y.L.Feng,H.Kunimoto,S.Chandhaket,A.Okuno,M.Nakaoka 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents a novel version of an active voltage clamped ZVS-PWM high frequency inverter using IGBTS for electromagnetic induction eddy current-based rolling drum heating in new generation copy and printing machines in consumer business use The operating principle of this inverter circuit and unique features are described herein Its constant frequency duty cycle (asymmetrical PWM) controlled voltage source quasi-resonant soft switching high frequency inverter employing IGBTS is proposed, which is capable of achieving stable and efficient zero voltage soft switching commutation over a widely specified power regulation range from full power to low power The operating performances in a steady state of this inverter is discussed and evaluated on basis of simulation and experimental results as an induction heated roller in new generation copy machine.<br/>
H.Tanaka,H Sadakata,H.Muraoka,A.Okuno,E.Hiraki,M.Nakaoka 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents an innovative prototype of a new conceptual electromagnetic induction heated type far infrared rays radiant heating appliance using the voltage-fed edge-resonant ZVS-PWM high frequency inverter using IGBTs for food cooking and processing which operates under a constant frequency variable power regulation scheme This power electronic appliance with soft switching high frequency inverter using IGBTs has attracted special interest from some advantageous viewpoints of safety, cleanliness, compactness and rapid temperature response, which is more suitable for consumer power electronics applications.<br/>