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Experimental and numerical simulation investigations of an axial flow fan performance in high-altitude environments
Ist Teil von
Energy (Oxford), 2021-11, Vol.234, p.121281, Article 121281
Ort / Verlag
Oxford: Elsevier Ltd
Erscheinungsjahr
2021
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
To study the operating performance of fans at high altitudes, a pressure-variable ventilation device able to vary the gas phase environment of fans and pipeline was designed. The fan performances at altitudes of 0 m, 900 m, 1900 m, 3000 m, and 4300 m were tested, and computational fluid dynamics (CFD) methods were used to simulate fan performance at high altitudes. The results indicated that under the same number of revolutions, as the altitude increases, the fan's output volume flow slightly decreases, the static pressure difference between the pressure surface and the suction surface of the blade decreases, the load of the blade decreases, the fan's output static pressure and shaft power linearly decrease, and the fan's static pressure efficiency nonlinearly decreases. In a high-altitude environment, the noise pressure pulsation interval and amplitude of fan noise are reduced, discrete noise and broadband noise are weakened at the same time, and the A sound level of each frequency band is reduced on a yearly basis.
•As the altitude increases, the fan's output volume flow slightly decreases.•As the altitude increases, the fan's pressure and shaft power linearly decrease.•As the altitude increases, the fan's efficiency nonlinearly decreases.•In a high-altitude environment, discrete noise and broadband noise are weakened.