The Numerical Analysis of Forward Fan Noise Shielding Effect on the Over-the-Wing Nacelle Configuration

Fukushima, Yuma; Misaka, Takashi; Obayashi, Shigeru; Sasaki, Daisuke; Nakahashi, Kazuhiro

doi:10.2514/6.2014-0720

Cited by 3 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only recently have we observed a return to interest in OWN aerodynamic performance [11][12][13][14][15][16][17], including distributed over-wing propulsion [18], and noise shielding characteristics [19][20][21][22]. One study by Hooker et al [13] is of particular interest.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of the Overwing Nacelle Design Space

Ahuja

Renganathan

Mavris

2022

Journal of Aircraft

View full text Add to dashboard Cite

The over-wing nacelle (OWN) concept refers to aircraft designs where the engine is installed above the wing. The OWN configuration offers several advantages over conventional under-wing nacelle (UWN) vehicles, which include improved fuel-burn and propulsive efficiencies due to the feasibility of ultra high bypass ratio turbofans, and reduced noise. However, a non-optimal OWN design can result in large transonic drag penalties that can potentially outweigh the aforementioned benefits. We study the OWN design problem from an aerodynamics and propulsion perspective, using the NASA common research model, a notional 90,000 pound thrust class turbofan model, and Reynolds-Averaged Navier-Stokes simulations. We first quantify the sensitivity of drag, lift, and pressure recovery to variations in engine location and power setting, and identify trends. Then, we perform aerodynamic design optimization of the wing and nacelle to determine OWN performance improvement from outer mold line refinement at a favorable engine installation location. A 20% reduction in drag is achieved for the optimized OWN configuration, highlighting the sensitivity of OWN aerodynamics to airframe contours. However, compared to the UWN baseline, the optimized OWN drag is 5% higher at the same lift and worsens significantly at higher lift.

show abstract

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of the Overwing Nacelle Design Space

Ahuja

Renganathan

Mavris

2022

Journal of Aircraft

View full text Add to dashboard Cite

show abstract

Influence of Turbulence Statistics on Stochastic Jet-Noise Prediction with Synthetic Eddy Method

Hirai¹,

Fukushima²,

Obayashi³

et al. 2019

Journal of Aircraft

View full text Add to dashboard Cite

Comparison of Overwing and Underwing Nacelle Aeropropulsion Optimization for Subsonic Transport Aircraft

Ahuja,

Hyun Lee,

Perron

et al. 2024

Journal of Aircraft

View full text Add to dashboard Cite

This research compares a forward-mounted overwing nacelle configuration to a conventional underwing nacelle for a single-aisle transport aircraft. We focus on characterizing the impact of the overwing placement on cruise fuel burn. To this end, we optimize both configurations under similar constraints and design processes. We use coupled computational fluid dynamics and propulsion cycle analysis with Gaussian process-based adaptive sampling in a multistage design process. The particular overwing design has a 4% higher fuel flow than the underwing design at cruise conditions. However, a postoptimization nacelle placement study illustrates that this fuel burn difference can drop to 2–3% if the overwing nacelle is moved farther forward in our design space without accounting for any resulting structural weight changes.

show abstract

The Numerical Analysis of Forward Fan Noise Shielding Effect on the Over-the-Wing Nacelle Configuration

Cited by 3 publications

References 15 publications

Sensitivity Analysis of the Overwing Nacelle Design Space

Sensitivity Analysis of the Overwing Nacelle Design Space

Influence of Turbulence Statistics on Stochastic Jet-Noise Prediction with Synthetic Eddy Method

Comparison of Overwing and Underwing Nacelle Aeropropulsion Optimization for Subsonic Transport Aircraft

Contact Info

Product

Resources

About