Noise computation of high-speed propeller-driven aircraft

Polacsek, Cyril; Spiegel, P.; Boyle, F.; Eaton, Jerry P.; Brouwer, Harry; Nijboer, R.

doi:10.2514/6.2000-2086

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…with the ONERA radiation acoustic code, solving the FWH equation in the frequency domain, and the NLR acoustic code for scattering and refraction [28]. • Time-averaged panel code predictions, coupled with a propeller slipstream model employing momentum-blade element theory [31,32].…”

Section: Steady and Unsteady Euler Simulations Combinedmentioning

confidence: 99%

“…Table 2 presents a summary of major works related to propellers installed on aircraft with tractor propeller configuration. Relevant findings of this research are: (i) the mutual interaction propeller-airframe is significant for both and unsteady, thus steady actuator disk computations can only give an average field estimate while time marching 3D simulations are needed to accurately capture interaction phenomena, especially in the case of propeller operating at incidence [24][25][26][27][28];…”

Section: Introductionmentioning

confidence: 99%

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Propeller installation effects on turboprop aircraft acoustics

Chirico

Barakos

Bown³

2018

Journal of Sound and Vibration

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Section: Steady and Unsteady Euler Simulations Combinedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Propeller installation effects on turboprop aircraft acoustics

Chirico

Barakos

Bown³

2018

Journal of Sound and Vibration

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“…The propeller model (Fig. 2) was originally built for the European APIAN (Advanced Propulsion Integration Aerodynamics and Noise) [11][12][13][14] project. It features six carbon fiber blades and a rotor diameter of 0.508 m. The blade angle at 75% of the radius was set to 40.4 degrees.…”

Section: A Wind Tunnel Facility and Modelsmentioning

confidence: 99%

Aerodynamic and Aeroacoustic Effects of Pylon Trailing Edge Blowing on Pusher Propeller Installation

Sinnige

Lynch

Ragni

et al. 2015

21st AIAA/CEAS Aeroacoustics Conference

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The aerodynamic and aeroacoustic effects of pylon trailing edge blowing on the propulsive performance and noise emissions of a propeller installed in a pusher configuration were studied in a wind tunnel. A propeller model and a pylon equipped with a trailing edge blowing system were installed in the large low-speed facility of the German-Dutch wind-tunnels (DNW-LLF). Particle image velocimetry measurements of the flow field downstream of the pylon confirmed a wake re-energization obtained through blowing, with a momentum deficit recovery of 80% compared to the unblown case. For the symmetric inflow conditions considered, the effect of pylon installation on the propulsive performance was found small. Increases in thrust and torque of 1% up to 6% were measured at high and low thrust settings, which was comparable to the measurement variability. Acoustic data obtained using out-of-flow microphones confirmed the strong interaction effects resulting from the installation of the upstream pylon, with an increase in noise levels due to the presence of the pylon of up to 12 dB at a medium propeller thrust setting. The application of pylon trailing edge blowing successfully eliminated the installation effects, resulting in noise levels equal to those of the isolated propeller over the entire axial directivity range. At higher thrust settings the change in blade angle of attack due to the pylon wake impingement is smaller, and the steady blade loads are larger compared to the unsteady loads experienced during the wake passage. Consequently, in this operating regime the propeller noise emissions were dominated by steady sources for all but the most upstream observer positions.

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“…The six-bladed propeller model (Fig. 3) featured a rotor diameter of 0.508 m, and was designed and built for the European APIAN (Advanced Propulsion Integration Aerodynamics and Noise) research project [13][14][15][16] . The blade angle at 75% of the radius was set to 40.4 degrees.…”

Section: Methodsmentioning

confidence: 99%

Pusher-Propeller Blade Loading With and Without Pylon Trailing-Edge Blowing

Sinnige

Ragni

Eitelberg

et al. 2016

34th AIAA Applied Aerodynamics Conference

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The aerodynamic interaction effects characteristic of pusher propellers were studied at the Large Low-Speed Facility of the German-Dutch wind tunnels (DNW-LLF). A propeller model was positioned downstream of a pylon equipped with a trailing-edge blowing system. Surface-pressure transducers integrated into the propeller blades confirmed the local impact of the pylon wake on the blade loads. At an intermediate thrust setting, the sectional lift impulsively increased by 30% during the wake passage. The application of pylon blowing decreased the integral velocity deficit in the pylon wake by up to 77% compared to the unblown case. As a result, the load fluctuations during the wake encounter were practically eliminated, thereby mitigating the adverse installation effects.

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Noise computation of high-speed propeller-driven aircraft

Cited by 10 publications

References 2 publications

Propeller installation effects on turboprop aircraft acoustics

Propeller installation effects on turboprop aircraft acoustics

Aerodynamic and Aeroacoustic Effects of Pylon Trailing Edge Blowing on Pusher Propeller Installation

Pusher-Propeller Blade Loading With and Without Pylon Trailing-Edge Blowing

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