• Proceedings of the SAREK Conference
• /
• 2009.06a
• /
• pp.1355-1360
• /
• 2009

This study simulates the flow characteristics of the turbo-fan which was applied to the industrial scale. Numerical analysis has been carried out to investigate a pulsation behavior of exhaust air that flow out the turbo fan, considering a constant rotating rate of impeller. Moving mesh technique provides time-accurate solutions for the flow inside an impeller. From the numerical results, FFT analysis has been made for pressure pulsations inside turbo-fan casing. The numerical simulation shows the pulsation of model-2 has higher than model. Additionally, BPF value is almost same as the numerical results.

• 유체기계공업학회:학술대회논문집
• /
• 2006.08a
• /
• pp.331-334
• /
• 2006

Air foil bearings have been attempted for application to industrial turbo machines, since they have several advantages over oil bearings in terms of endurance, simplicity, environment-friendliness, efficiency, sound and vibration, and small turbo machines with air foil bearings are in the market as the result. Recently, researches on widening the application spectrum of air foil bearings are in progress worldwide. In this paper, a 300 HP class turbo blower using air foil bearings is introduced. The turbo blower has a high speed PMSM(Permanent Magnet Synchronous Motor) driving a compressor, and air flow rate is designed to be $180\;m^3/min$ at pressure ratio of 1.6. The maximum rotational speed is set to 17,000 RPM to maximize the total efficiency with the result that the weight of rotor assembly is 26kg, which is expected to be the largest turbo machine with air foil bearings ever developed in the world.