Investigation of rotor noise source mechanisms with forward speed simulation

Grosche, F.-R.; Stiewitt, H.

doi:10.2514/6.1977-1361

Cited by 3 publications

(3 citation statements)

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“…either profiles out of the NACA00 series or flat plates. Some reports publish data, mostly via particular case studies, on PVS related to asymmetrical blade profiles, 6,9,10,20,[31][32][33][34] being more relevant to realistic axial fan design than symmetrical profiles.…”

Section: Determination Of Quantities Influencing Pvsmentioning

confidence: 99%

“…The above literature overview points to the complexity of the PVS phenomenon even in the case of isolated airfoils exposed to uniform, steady flow [1,2,7,[9][10][11][13][14][15][16][17][18][19]. On the basis of Longhouse [6] and Grosche & Stiewitt [20], it is reasonable to expect that PVS phenomenon occurs in the case of rotating blade rows 10 as well. Therefore, according to the literature, it is concluded that PVS has two relevant aspects from a fan engineering point of view: noise and vibration.…”

Section: ) Introduction and Objectivesmentioning

confidence: 99%

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Profile vortex shedding from low-speed axial fan rotor blades: a modelling overview

Daku

Vad

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper presents an overview of the characteristics potentially influencing the profile vortex shedding (PVS) phenomenon being relevant in noise and vibration of low-speed axial fan rotor blades. Dimensional analysis has been applied to explore the essential dimensionless quantities in a systematic and comprehensive manner. On this basis, limitations have been established, and simplifying assumptions have been set up in terms of PVS investigation. Groups of dimensionless characteristics playing a role in the semi-empirical model for predicting the PVS frequency were identified. The available semi-empirical model and its unique features related to the measurement evaluation methodology and Reynolds number dependence have been outlined. The presented comprehensive analysis provides guidelines from the perspective of transferability of the literature data on PVS from steady, isolated blade profile models to low-speed axial fan rotors. It also results in the formulation of objectives of future research related to PVS.

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Section: Determination Of Quantities Influencing Pvsmentioning

confidence: 99%

Section: ) Introduction and Objectivesmentioning

confidence: 99%

Profile vortex shedding from low-speed axial fan rotor blades: a modelling overview

Daku

Vad

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…This acoustic program predicts the rotational and vortex noise signatures of the propeller at any specified observer location. Tne blades are divided into several (up to 20) radial sections at which the various blade and aerodynamic parameters are represented. The output of the program is the noise pressure-time history at a finite number of observer locations in the fixed system.…”

Section: Design Of Propeller Configurations For Noise Investigationmentioning

confidence: 99%

Investigation of Performance, Noise, and Detectability Characteristics of Remotely Piloted Vehicle (RPV) Propellers

Janakiram¹

1980

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A APPLIED TECHNOLOGY LABORATORY U. S. ARMY RESEARCH AND TECHNOLOGY LABORATORIES (AVRADCOM)Foet Eustis, Va. 23604 APPLIED TECHNOLOGY LABORATORY POSITION STATEMENTReconnaissance and target detection RPVs that use piston engine driven propellers are highly susceptible to ground detection due to propulsion system noise.This report examines the noise and detectability aspects of designing propellers for RPVs using piston engines in the 25 horsepower category.Results of this work, although preliminary, cover design variao)les considered essential to selecting best choice minimum detection propeller configurations. Future R&D in this area is desired to develop performance/noise data from small-scale propellers to a level that compares with that of large-scale propellers.Bill W. Scruggs, Jr., of the Aeronautical Systems Division served as project engineer for this effort. DISCLAIMERSThe findings in this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.When Government drawings, specifications, or other data are used for any purpose other than in connection with a definitely related Government procurement operation, the United States Government thereby incurs no responsibility nor any obligation whatsoever, and the fact that the Government may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission, to manufacture, use, or sell any patented iniention that may in any wa be related thereto.Trade names cited in this report do not constitute an official endorsement or approval of the use of such commercial hardware o. software. DISPOSITION :NSTRUCTIONS Destroy this report when no longer neededDo not return t to the originator. Several small-scale propeller configurations applicable to a conceptual Remotely Piloted Vehicle (RPV) aircraft were designed, fabricated, and tested to determine their performance, acoustic, an~d detectability characteristics.The tests were conducted in static and simulated forward flight conditions in a wind tunnel. Propellers tested included tractor, pusher, and ducted configurations. The accustic data obtained was used to determine the slar' It is concluded that the acoustic and detectability characteristcsa of small-scale RPV propellers are, in general, significantly different from those of the large-scale propellers. It was found that the forward velocity has a significant effect on the acoustic characteristics as well as the detection distances (slant range and altitude of no detection) of most of the RPV propeller configurations tested. An increase in forward velocity resulted in a significant drop in the SPLs at higher harmonics (beyond 4th or 5th) of the blade passage frequency in the forward direction as well as in and about the plane of the propeller. In fact, for most of the propeller configurations tested, an...

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Noise and detectability characteristics of small-scale remotely piloted vehicle propellers

Janakiram¹,

Scruggs²

1982

Journal of Aircraft

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Investigation of rotor noise source mechanisms with forward speed simulation

Cited by 3 publications

References 2 publications

Profile vortex shedding from low-speed axial fan rotor blades: a modelling overview

Profile vortex shedding from low-speed axial fan rotor blades: a modelling overview

Investigation of Performance, Noise, and Detectability Characteristics of Remotely Piloted Vehicle (RPV) Propellers

Noise and detectability characteristics of small-scale remotely piloted vehicle propellers

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