Abstract
AbstractThe research to be aimed an axial-flow of electric fan and improve the character of extend. In the other ways, it is add the composite model the guide vane out the fan. The purpose is reduce the vortex happened. It made the air-floating model improve to the balance and fluid smooth. The improve because the second flow influence. Upgrade the fan function and reduce the flow visualization caused the fan noise.At first we need design and set four same leaves of the fan, the different level and horizontal inclination angle to contrast to the fan, after CNC to manufacture the fan of the aerofoil. It also creative the prototype of the fan. This experiment utilizes in AMCA Standard and match the equipment of wind tunnel to measure the efficiency function curve of the 210-85 standard. And follow the ANSI 12.35 under the Free Field Full Anechoic Chamber to perform the noise test. Finally, we put the fan in the water tunnel and observed the situation of the flow. We should focus those four groups contrast the fan to design 12 different to the leaves of the fan. The guide vane based on the different water level of horizontal inclination angle. To repeat the three tests and compare what the different before put the guide vane. Finally, use the water tunnel to verify and approve the fan added the guide fan it will reduce the second flow happened. Owing to stagnate area scale and wide margin to decrease. The vortex wide be reduced. After added the guide vane the maximum static pressure maybe promote about 10%. Because the vortex disturb caused the wind pressure can reduce 1 to 4dB also.After a series of experimentation, we obtain a large number of data and static with analysis get the result that fan leaves of the guide vane is relative to promote the maximum static pressure. The water level and inclination of angle will get the relationship and match the fan to promote static pressure area.