Preprint Article Version 1 This version not peer reviewed

Axial fan blade vibration under inlet cross-flow

Version 1 : Received: 4 July 2017 / Approved: 5 July 2017 / Online: 5 July 2017 (04:22:10 CEST)

A peer-reviewed article of this Preprint also exists.

Heinemann, T.; Becker, S. Axial Fan Blade Vibration Assessment under Inlet Cross-Flow Conditions Using Laser Scanning Vibrometry. Appl. Sci. 2017, 7, 862. Heinemann, T.; Becker, S. Axial Fan Blade Vibration Assessment under Inlet Cross-Flow Conditions Using Laser Scanning Vibrometry. Appl. Sci. 2017, 7, 862.

Journal reference: Appl. Sci. 2017, 7, 862
DOI: 10.3390/app7080862

Abstract

In thermal power plants equipped with air-cooled condensers, axial cooling fans operate under the influence of ambient flow fields. Under inlet cross-flow conditions, the resultant asymmetric flow field is known to introduce additional harmonic forces to the fan blades. This effect has previously been studied only numerically or using blade mounted strain gauges. For this study, Laser Scanning Vibrometry was used to assess fan blade vibration under inlet cross-flow conditions in an adapted fan test rig inside a wind tunnel test section. Two co-rotating laser beams scanned a low pressure axial fan, resulting in spectral, phase resolved surface vibration patterns of the fan blades. Two distinct operating points were examined, with and without inlet cross-flow influence. While almost identical fan vibration patterns were found for both reference operating points, overall blade vibration increased by 100% at low fan flow rate due to cross-flow, and by 20% at high fan flow rate. While numerically predicted natural frequency modes could be confirmed from experimental data as minor peaks in the vibration amplitude spectrum, they were not excited significantly by cross-flow. Instead, primarily higher rotation rate harmonics were amplified, i.a. a synchronous blade tip flapping was strongly excited at the blade pass frequency.

Subject Areas

axial fan; laser scanning vibrometry; wind tunnel; inlet cross-flow; blade vibration

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