The results of an experimental investigation of the flow at two exit radial locations of a forward-curved blades centrifugal fan are presented. Hot wire techniques were used to obtain steady velocity components and velocity unsteadiness levels (rms value of the components of velocity fluctuation) for different operating conditions. Globally speaking, the data reveal a strong flow asymmetry, with considerable changes in both magnitude and direction along the different circumferential positions. Particularly, big differences appear between the circumferential positions closer to the volute tongue and the other ones. The periodic character of the velocity signals due to the passing of the blades, clearly observed around the impeller, is missed in the vicinity of the volute tongue, where the main contribution to the velocity fluctuations appears to be random. Based on the measured velocity signals, velocity unsteadiness of the flow is determined analyzing the main contributions as a function of the flow rate and the measurement position. High levels of velocity unsteadiness were observed near the volute tongue, mainly at low flow rates.
Unsteady Flow Pattern Characteristics Downstream of a Forward-Curved Blades Centrifugal Fan
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division August 12, 1999; revised manuscript received December 11, 2000. Associate Editor: B. Schiavello
- Views Icon Views
- Share Icon Share
- Search Site
Velarde-Sua´rez, S., Ballesteros-Tajadura, R., Santolaria-Morros, C., and Gonza´lez-Pe´rez, J. (December 11, 2000). "Unsteady Flow Pattern Characteristics Downstream of a Forward-Curved Blades Centrifugal Fan ." ASME. J. Fluids Eng. June 2001; 123(2): 265–270. https://doi.org/10.1115/1.1351175
Download citation file: