Analysis of APIAN high speed isolated test results - acoustics and aerodynamics

Frota, J.; Maury, Eric

doi:10.1016/s1290-0958(01)90064-4

Cited by 4 publications

(4 citation statements)

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“…The propeller featured a diameter of 0.508 m and six highly swept blades, representative of a high-speed propeller design. The model was developed and used before in the Advanced Propulsion Integration Aerodynamics and Noise (APIAN) project [14] funded by the European Union. The blade pitch angle at r∕R 0.75 was set to 40.4 deg with respect to the local chord line, with the pitch angle defined such that the blade section is aligned with the rotational direction for a pitch angle of 0 deg.…”

Section: Modelsmentioning

confidence: 99%

Aerodynamic and Aeroacoustic Performance of a Propeller Propulsion System with Swirl-Recovery Vanes

Sinnige

Stokkermans

Ragni

et al. 2018

Journal of Propulsion and Power

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Swirl-recovery vanes (SRVs) enhance propulsive efficiency by converting the rotational kinetic energy in a propeller slipstream into additional thrust. This paper discusses the aerodynamic and aeroacoustic impact of the installation of a set of SRVs downstream of a single-rotating propeller. Experiments were carried out in a large low-speed wind tunnel, whereas simulations were performed by solving the Reynolds-averaged Navier-Stokes equations. Favorable comparisons between the experimental and numerical slipstream data validated the simulations, which predicted a maximum propulsive-efficiency increase of 0.7% with the current design of the SRVs. This can be improved further by optimizing the pitch distribution of the SRVs. The upstream effect of the SRVs on the time-averaged propeller performance was negligible. Yet, small but systematic unsteady propeller loads were measured with a peak-to-peak amplitude of at most 2% of the time-averaged loading, occurring at a frequency corresponding to the five SRV passages during one revolution. The downstream interaction was one order of magnitude stronger, with unsteady loading on the SRVs with a peak-to-peak amplitude of about 20% of the time-averaged load. The interaction mechanisms caused an increase of the tonal noise levels of 3-7 dB, with the noise penalty decreasing with increasing propeller thrust setting.

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Section: Modelsmentioning

confidence: 99%

Aerodynamic and Aeroacoustic Performance of a Propeller Propulsion System with Swirl-Recovery Vanes

Sinnige

Stokkermans

Ragni

et al. 2018

Journal of Propulsion and Power

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“…Wind tunnel tests campaign for the enhanced GEMINI II model [27]: aerodynamic and acoustic measurements.…”

Section: Commission)mentioning

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%

Propeller installation effects on turboprop aircraft acoustics

Chirico

Barakos

Bown³

2018

Journal of Sound and Vibration

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“…The characteristics of the propeller and pylon models are provided in Tables 1 and 2, respectively. The six-bladed propeller of 0.508 m diameter was designed and built for the EU-funded APIAN project [20][21][22]. The blade pitch angle was set to 40.4°at r/R = 0.75, as defined from the direction of the tangential velocity of the blade.…”

Section: Methodsmentioning

confidence: 99%

APIAN-INF: an aerodynamic and aeroacoustic investigation of pylon-interaction effects for pusher propellers

et al. 2017

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Advanced propellers promise significant fuelburn savings compared to turbofans. When installed on the fuselage in a pusher configuration, the propeller interacts with the wake of the supporting pylon. This paper presents an experimental analysis of the aerodynamic and aeroacoustic characteristics of this pylon-propeller interaction. An isolated propeller was operated in undisturbed flow and in the wake of an upstream pylon at the large low-speed facility of the German-Dutch wind tunnels (DNW-LLF). Measurements of the pylon-wake characteristics showed that the wake width and velocity deficit decreased with increasing thrust due to the suction of the propeller. The installation of the pylon led to a tonal noise penalty of up to 24 dB, resulting from the periodic blade-loading fluctuations caused by the wake encounter. The noise penalty peaked in the upstream direction and became increasingly prominent with decreasing propeller thrust setting, due to the associated reduction of the steady blade loads. The integral propeller performance was not significantly altered by the pylon-wake encounter process. However, at sideslip angles of ±6°, the effective advance ratio of the propeller was modified by the circumferential velocity components induced by the pylon tip vortex. The propeller performance improved when the direction of rotation of the propeller was opposite to that of the pylon tip vortex. Under this condition, a reduction was measured in the noise emissions due to a favorable superposition of the angular-inflow and pylon-wake effects.Keywords Propulsion integration Á Pusher propellers Á Propeller noise Á Pylon-installation effects List of symbols BNumber of blades

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Analysis of APIAN high speed isolated test results - acoustics and aerodynamics

Cited by 4 publications

References 0 publications

Aerodynamic and Aeroacoustic Performance of a Propeller Propulsion System with Swirl-Recovery Vanes

Aerodynamic and Aeroacoustic Performance of a Propeller Propulsion System with Swirl-Recovery Vanes

Propeller installation effects on turboprop aircraft acoustics

APIAN-INF: an aerodynamic and aeroacoustic investigation of pylon-interaction effects for pusher propellers

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