A Three-Dimensional Analysis of Rotor Wakes

Whitfield, C. E.; Kelly, Jonathan; Barry, B.

doi:10.1017/s0001925900006181

Cited by 12 publications

(8 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A single-sensor hot-wire measurement technique was developed by Whitfield, et al (8) and Hirsh and Kool (9) has made attempts to extend these techniques to the measurement of turbulence intensities of the exit flow of a rotor.…”

Section: Experimental Methodsmentioning

confidence: 99%

Experimental Study on the Three-Dimensional Unsteady Flow Characteristics of the Counter-Rotating Axial Flow Fan

Cho

Cha

2009

JFST

View full text Add to dashboard Cite

The counter-rotating axial flow fan shows that the complex flow characteristics with three-dimensional, viscous, and unsteady flow fields. For the understanding of the entire core flow in counter-rotating axial flow fan, it is necessary to investigate the three-dimensional unsteady flow field between the rotors. This information is also essential for the improvement of the aerodynamic characteristics, the reduction of the aerodynamic noise level and vibration characteristics of the counter-rotating axial flow fan. The purpose of this study is, therefore, to present the periodic characteristics of the blade passage flow, the wake and the tip vortex, which are utilized for the blade design data for the improvement of the aerodynamic characteristics, the reduction of the aerodynamic noise level and vibration characteristics of the counter-rotating axial flow fan. In this paper, the three-dimensional unsteady flow by the rotor-rotor interaction of the CRF were investigated at the design point(peak efficiency operating point). Unsteady flow fields in the CRF are measured at the cross-sectional planes of the upstream, between and downstream of each rotor using the 45° inclined hot-wire probe. The stationary hot-wire technique used the 45° inclined hot-wire probe, which rotates successively with 120 degrees increments about its own axis. And, the sampling data of unsteady flow fields were phase-locked averaged to remove the random components.

show abstract

Section: Experimental Methodsmentioning

confidence: 99%

Experimental Study on the Three-Dimensional Unsteady Flow Characteristics of the Counter-Rotating Axial Flow Fan

Cho

Cha

2009

JFST

View full text Add to dashboard Cite

show abstract

“…Two types of hot wire probes were used: a single wire whose output was utilized for frequency analysis and a slanted hot wire probe for three-dimensional measurements, which utilizes a method proposed by Whitfield et al [6].…”

Section: Experimental Apparatusmentioning

confidence: 99%

Application of casing treatment to an industrial axial-flow fan

Hill

Elder

McKenzie

1998

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

This paper deals with an experimental investigation into the influence of a vaned recess casing treatment on the performance of an industrial-type axial-flow fan with a hub-tip ratio of 0.4. The treatment has been tested in a variety of configurations relative to the fan, with an emphasis on the amount of fan blade tip exposure to the treatment. Two sets of blading, one of which is of the fully reversible type, have been investigated.Detailed flow measurements have been carried out with a slanted hot wire probe to provide an insight into the operation of the device and into the nature of the rotating stall in the solid casing configuration. Strain gauges have been employed to enable blade stresses to be recorded and an in-duct microphone to enable comparative tests on fan noise has also been used. NOTATION P R fan input power (kW) v r radial velocity (m/s) v t tangential velocity (m/s) (positive in the direction of rotor rotation) DH stage enthalpy rise ¼ P R =ṁ, where m is the mass flowwhere q v is the volume flowrate (m 3 /s) and DP the pressure rise across the fan (Pa)where v a is the axial velocity (m/s) and u m the mid-span blade speed (m/s) Φ solid flow coefficient at the stall point for solid casing Φ treated flow coefficient at the stall point for treated casing Ψ total-to-static pressure rise coefficient ¼ DP=ð0:5ru 2 m ) Ψ solid peak pressure rise coefficient for solid casing Ψ treated peak pressure rise coefficient for treated casing INTRODUCTION

show abstract

“…A modified 3-D flow measurement technique with a 54.7 0 slanted hot-wire as proposed by Whitfield et al(1972) was used. Due to the asymmetrical characteristics and limited calibration range of the slanted hot-wire, great care was taken to position the probe and interpret the measurements.…”

Section: Experimental Facility and Instrumentationmentioning

confidence: 99%

Recessed Casing Treatment Effects on Fan Performance and Flow Field

Kang

McKenzie

Elder

1995

Volume 1: Turbomachinery

View full text Add to dashboard Cite

An experimental investigation to examine the influence of the vaned recess casing treatment on stall margin, operating efficiency and the flow field of a low speed axial flow fan with aerospace type blade loading is presented. Different geometrical designs of the vaned passages were examined. The best configuration resulted in a stall margin improvement of 67%, a significantly higher pressure rise in the stall region and insignificant change in peak efficiency. Detailed 3-D flow measurements in the endwall region and in the casing recess were carried out with a slanted hot-wire, providing some insight to the operation of the device. The results revealed that the stall margin improvement was largely due to the removal of flow from the blade tip to the recess, and the elimination of the growth of the stall region at the tip, which occurs at stall in the solid casing build.

show abstract

A Three-Dimensional Analysis of Rotor Wakes

Cited by 12 publications

References 8 publications

Experimental Study on the Three-Dimensional Unsteady Flow Characteristics of the Counter-Rotating Axial Flow Fan

Experimental Study on the Three-Dimensional Unsteady Flow Characteristics of the Counter-Rotating Axial Flow Fan

Application of casing treatment to an industrial axial-flow fan

Recessed Casing Treatment Effects on Fan Performance and Flow Field

Contact Info

Product

Resources

About