Flow control in axial fan inlet guide vanes by synthetic jets

• Published in: EPJ Web of conferences Vol. 45; pp. 1021 - np
• Main Authors: Cyrus, V., Trávníček, Z., Wurst, P., Kordík, J.
• Format: Journal Article
• Language: English
• Published: EDP Sciences 01-01-2013
• Subjects: Axial flow; Casing (material); Guide vanes; Inlets; Reduction; Separation; Synthetic jets; Turning
• ISBN: 9788073729127; 8073729121
• ISSN: 2100-014X; 2100-014X
• DOI: 10.1051/epjconf/20134501021

Tested high pressure axial flow fan with hub/tip ratio of 0.70 and external diameter of 600 mm consisted of inlet guide vanes (IGV), rotor and stator blade rows. Fan peripheral velocity was 47 m/s. Air volume flow rate was changed by turning of rear part of the inlet guide vanes. At turning of 20 deg the flow was separated on the IGV profiles. The synthetic jets were introduced through radial holes in machine casing in the location before flow separation origin. Synthetic jet actuator was designed with the use of a speaker by UT AVCR. Its membrane had diameter of 63 mm. Excitation frequency was chosen in the range of 500 Hz - 700 Hz. Synthetic jets favourably influenced separated flow on the vane profiles in the distance of (5 - 12) mm from the casing surface. The reduction of flow separation area caused in the region near the casing the decrease of the profile loss coefficient approximately by 20%.