A coupling of computational methods for CROR installation effects

Sanders, Laurent; Mincu, Daniel C.; Denis, Williams; Vitagliano, Pier Luigi; Minervino, Mauro; Kennedy, John; Eret, Petr; Bennett, Gareth J.

doi:10.2514/6.2014-3190

Cited by 4 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to the noise characteristics, the results are intended to serve as a database for the validation of numerical codes. Some preliminary achievements with a satisfactory agreement between the numerical and experimental data can be found in Sanders et al 13 measured was found to be 10 dB lower than the tonal noise sources under investigation in this work which was considered to be satisfactory. The tunnel produces a uniform velocity flow, which varies by only 0.5% over the area of the test section with a turbulence intensity, which can be controlled between 0.26-8% as the tunnel also contains a controllable turbulence generation system, see Pininfarina -Wind Tunnel 14 for more technical details.…”

Section: Introductionsupporting

confidence: 76%

“…In that work, which had a low Mach number of 0.1, similar to ours, negligible corrections of the order of magnitude of 1 dB were found to be required, apart from for one position at 150 , which is equivalent to our most downstream microphone no. 13, where a correction of 2 dB was needed. However, the application of such shear layer correction procedures to CROR emissions are still the subject of extensive study, are not straightforward and may not even be applicable for the more complicated sound fields generated by a CROR source.…”

Section: Test Configurationsmentioning

confidence: 99%

“…In addition to the noise characteristics, the results are intended to serve as a database for the validation of numerical codes. Some preliminary achievements with a satisfactory agreement between the numerical and experimental data can be found in Sanders et al 13 Experimental facilities and instrumentation Figure 2 depicts the out-of-flow microphone used for background measurements in an empty wind tunnel (engine running without blades installed was not tested). The background noise level measured was found to be 10 dB lower than the tonal noise sources under investigation in this work which was considered to be satisfactory.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental observations of an installed-on-pylon contra-rotating open rotor with equal blade number in pusher and tractor configuration

Eret

Kennedy

Amoroso

et al. 2016

International Journal of Aeroacoustics

Self Cite

View full text Add to dashboard Cite

Noise from contra-rotating open rotors is a major obstacle to the adoption of this fuel efficient technology as a viable aircraft propulsion system. A better understanding of both contra-rotating open rotor noise generation and reduction has been achieved due to ongoing extensive research. One of the most recent research activities is the WENEMOR (wind tunnel tests for the evaluation of the installation effects of Noise EMissions of an open rotor advanced regional aircraft) project, which has been developed in response to the requirements described in the Clean SkyIntegrated Technology Demonstrators under the heading of Green Regional Aircraft. The project investigates the airframe installation effects of a 1=7th scale model of a regional aircraft equipped with two contra-rotating open rotors of the same rotor diameter, the same rotational speed and equal blade number. For this case, the blade passing frequency of rotor-alone tones and the frequency of relevant interaction tones cannot be distinguished due to the equal blade count of the two rotors. This study presents the tone directivity plots up to 4 Â blade passing frequency of the isolated WENEMOR single pylon contra-rotating open rotor engine in both pusher and tractor configurations at various angles of incidence and flow velocities. A linear array of 13 microphones is deployed for the far field sound measurements. The tone directivity trends show the efficient on-axis acoustic radiation at all blade passing frequency tones with the contra-rotating open rotor tone at 2 Â blade passing frequency dominating in the vast majority of the tests. The main objective is to compare the acoustic emission of pusher and tractor configurations tested under the same flow velocities and angles of incidence. The results suggest that the pusher configuration of the isolated contra-rotating open rotor tends to be slightly louder than the tractor at 2 Â blade passing frequency. However, it is shown that the acoustic performance of the isolated contra-rotating open rotor is complicated and sensitive to any change in the flow velocity and the angle of incidence. The increasing flow velocity and the increasing angle of incidence show limited consistency in proportional trends in the directivity plots of sound pressure levels. It is anticipated that the findings will be different for a more realistic case of installedon-model contra-rotating open rotor.

show abstract

Section: Introductionsupporting

confidence: 76%

Section: Test Configurationsmentioning

confidence: 99%

“…In addition to the noise characteristics, the results are intended to serve as a database for the validation of numerical codes. Some preliminary achievements with a satisfactory agreement between the numerical and experimental data can be found in Sanders et al 13 Experimental facilities and instrumentation Figure 2 depicts the out-of-flow microphone used for background measurements in an empty wind tunnel (engine running without blades installed was not tested). The background noise level measured was found to be 10 dB lower than the tonal noise sources under investigation in this work which was considered to be satisfactory.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental observations of an installed-on-pylon contra-rotating open rotor with equal blade number in pusher and tractor configuration

Eret

Kennedy

Amoroso

et al. 2016

International Journal of Aeroacoustics

Self Cite

View full text Add to dashboard Cite

show abstract

“…The comparisons of the acoustic emissions of the pusher and the tractor configuration tested at the same flow velocities and angles of incidence favor slightly the tractor configuration at 2*BPF which are the dominant rotor tones when ignoring the influence of the pylon. These experimental results are being utilized by GRA partners to develop and validate numerical codes for CROR noise prediction with initial results recently reported by Sanders et al 6,7 The more recent paper by Sanders reviews the literature for installation effects.…”

Section: Introductionmentioning

confidence: 94%

“…The perpendicular distance from the center of the front blade plane to the linear microphone array varies depending on both engine pylon angle and also on the extension which ranges between a minimum distance of 6.28D and a maximum of 6.65D. The work of Sanders et al 6,7 conducted a numerical simulation of the WENEMOR engine and demonstrated that the farfield region begins at a distance of 1.5D for the fundamental BPF.…”

Section: Experimental Facilitiesmentioning

confidence: 99%

A parametric study of airframe effects on the noise emission from installed contra-rotating open rotors

Kennedy

Eret

Bennett

2018

International Journal of Aeroacoustics

View full text Add to dashboard Cite

This work reports on the results of the Clean Sky WENEMOR project which has conducted an extensive experimental investigation of installed contra-rotating open rotors on a scale model of an advanced regional aircraft configuration. The tests were conducted in the Pininfarina Wind Tunnel, Italy and the data used for this analysis were taken from a linear far-field array of microphones. The contra-rotating open rotors were operated in pusher and tractor modes with approach and takeoff settings for revolutions per minute and thrust. Realistic modern blade profiles were supplied and utilized through the Clean Sky Green Regional Aircraft program. A range of airframe geometries was tested which included interchangeable tails, engine pylon elongation, engine pylon rotation, and variable wing to engine distance. Changes in the contra-rotating open rotor noise emission to the far field as a function of flow speed, angle of attack, and airframe geometry were clearly identified. The influence of airframe geometry on contra-rotating open rotor tonal content, directivity, and broadband levels is reported for emission angles from 30 to 150. Both significant noise increases and decreases with respect to the baseline airframe configurations were detected in both the tonal and broadband levels as a function of emission angle (ranging from 10 to 25 dB at the blade passing frequency tones). While the changes to the tonal level were generally greater than those of the broadband level, the broadband levels are shown to be significant when considering the influence of airframe geometries on contra-rotating open rotor noise emission.

show abstract

Aeroacoustics research in Europe: The CEAS-ASC report on 2018 highlights

Gely

Bennett

2019

Journal of Sound and Vibration

Self Cite

View full text Add to dashboard Cite

The Council of European Aerospace Societies (CEAS) Aeroacoustics Specialists Committee (ASC) supports and promotes the interests of the scientific and industrial aeroacoustics community on an European scale and European aeronautics activities internationally. In this context, "aeroacoustics" encompasses all aerospace acoustics and related areas. Each year the committee highlights some of the research and development projects in Europe.This paper is a report on highlights of aeroacoustics research in Europe in 2018, compiled from information provided to the ASC of the CEAS. During 2018, a number of research programmes involving aeroacoustics were funded by the European Commission. Some of the highlights from these programmes are summarised in this article, as well as highlights from other programmes funded by national programmes or by industry. Furthermore, a concise summary of the CEAS-ASC workshop "Future Aircraft Design and Noise Impact" held in the Netherlands Aerospace Centre (NLR) Amsterdam in September 2018 is included in this report.Enquiries concerning all contributions should be addressed to the authors who are given at the end of each subsection.

show abstract

A coupling of computational methods for CROR installation effects

Cited by 4 publications

References 5 publications

Experimental observations of an installed-on-pylon contra-rotating open rotor with equal blade number in pusher and tractor configuration

Experimental observations of an installed-on-pylon contra-rotating open rotor with equal blade number in pusher and tractor configuration

A parametric study of airframe effects on the noise emission from installed contra-rotating open rotors

Aeroacoustics research in Europe: The CEAS-ASC report on 2018 highlights

Contact Info

Product

Resources

About