Multi-disciplinary simulation of propeller-turboprop aircraft flight

Filippone, Antonio; Mohamed-Kassim, Zulfaa

doi:10.1017/s0001924000007454

Cited by 14 publications

(10 citation statements)

References 15 publications

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“…A tractor CROR has been designed to be representative of a general aviation propulsion system. Using the FLIGHT aircraft performance code [15,16] to simulate the Beechcraft 350i at take-off conditions, the CROR configuration has been sized to deliver a take-off thrust of 6 kN. With a reference tip speed of M T = 0.46 and fore and aft blade count equal to 4 (N 1 = N 2 = 4), a 3 m diameter CROR resulted.…”

Section: Description Of Test Casesmentioning

confidence: 99%

Acoustic Analysis of Counter-Rotating Open Rotors with a Locked Blade Row

2020

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Counter Rotating Open Rotors (CROR) have the potential to reduce environmental emissions thanks to their high propulsive efficiency. However, there are a number of concerns surrounding their acoustic emissions. This contribution presents a novel multi-configuration CROR that offers considerable noise reductions. In particular, we consider locking either fore or aft rotor during takeoff , with the running rotor providing the required thrust. During cruise, both rotors are operated to retain the high efficiency of the CROR. A coupled Computational Fluid Dynamics-Computational Aeroacoustics analysis (CFD-CAA) has shown the potential of this multi-configuration concept to offer substantial noise reductions when compared to a baseline CROR. During a simulated constant-altitude flyover at takeoff conditions, reductions of 3.5 dBA and 7.9 dBA have been demonstrated when either fore or aft row is locked, respectively. Using the EPNL metric, this result corresponded to7 EPNLdB and 12 EPNLdB, respectively, for the same flyover.

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Section: Description Of Test Casesmentioning

confidence: 99%

Acoustic Analysis of Counter-Rotating Open Rotors with a Locked Blade Row

2020

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“…Table 3 shows the rotor operating characteristics at each flight phase considered. These values were obtained using the FLIGHT aircraft performance code [48,49] for the Beechcraft 350i aircraft to represent a general aviation class aircraft.…”

Section: Inoperative Fore Rotormentioning

confidence: 99%

Noise reduction of a Counter Rotating Open Rotor through a locked blade row

Smith

Filippone

Bojdo

2020

Aerospace Science and Technology

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Counter Rotating Open Rotors (CROR) have the potential to significantly reduce aircraft emissions. However, there are a number of concerns surrounding their noise levels. In this contribution, we propose a number of novel configurations to reduce the noise of CROR for general aviation aircraft. In particular, we lock either fore or aft blade row on departure and approach, and keep the CROR trimmed at the same thrust as in design configuration (both rotors running). The CROR is switched back to design configuration at cruise to regain the high propulsive efficiency. To further reduce noise, two additional cases are investigated: 1.) folded aft rotor; 2.) increased diameter fore rotor (with locked-aft blade row). A low-order CROR trim code that has been developed to compute the aerodynamic and aeroacoustic performance of new design configurations is used in the numerical analysis. The results demonstrate significant noise gains for a number of blade count combinations during a constant altitude flyover. The analysis found that using a locked-fore and locked-aft configuration resulted in a maximum noise reduction of around 3 dB(A) (or 3 dB (EPNL)) and 3 dB(A) (or 6 dB (EPNL)) respectively. Folding the aft rotor backward could result in a maximum noise gain of around 12 dB(A). Increasing the fore rotor diameter by 30% was shown to reduce noise by a maximum of 8 dB(A) against an operative CROR of the same tip extension.

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“…Using the FLIGHT aircraft performance code [31,32] to simulate a representative general aviation aircraft, the baseline CROR was sized to deliver a required take-off thrust of = 6 kN at ∞ = 0.2. With equal fore and aft blade counts ( 1 = 2 = 4) and tip speeds ( = 0.46), corresponding to Ω = 1, 000 rev/min, a 3m diameter CROR design resulted.…”

Section: Description Of Test Casesmentioning

confidence: 99%