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Evaluation of the Slotted, Natural-Laminar-Flow Airfoil Concept for Several Aeronautical Design Applications
Evaluation of the Slotted, Natural-Laminar-Flow Airfoil Concept for Several Aeronautical Design Applications
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153004
- ISBN
- 9798346384267
- DDC
- 600
- 서명/저자
- Evaluation of the Slotted, Natural-Laminar-Flow Airfoil Concept for Several Aeronautical Design Applications
- 발행사항
- [Sl] : The Pennsylvania State University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 220 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
- 주기사항
- Advisor: Maughmer, Mark D.
- 학위논문주기
- Thesis (Ph.D.)--The Pennsylvania State University, 2024.
- 초록/해제
- 요약The slotted, natural-laminar-flow (SNLF) airfoil is a low-drag, high-lift airfoil concept that has been explored for commercial aviation applications. This work seeks to determine the benefits of SNLF airfoils for three other aeronautical design problems: a light business jet, a high-performance sailplane, and a light-helicopter tail rotor. For each case, a baseline geometry is developed that provides a fair representation of an effective natural-laminar-flow (NLF) solution for the given application. An SNLF geometry is then designed with the parameters tailored to utilize the strengths of SNLF airfoils while keeping realistic constraints on the geometry and design process. The aerodynamic performance of the baseline and SNLF solutions are then evaluated with transitional RANS CFD.An SNLF light business jet is designed based on the HondaJet. Airfoil selection for the SNLF and baseline geometries is discussed, along with the sizing steps that lead to an 8% reduction in wing area for the SNLF aircraft. Transition via Gortler instabilities is considered and analyzed and is found to have a negligible effect on the performance of the SNLF aircraft. Interference drag from the wing-fuselage and wing-winglet junctures is quantified, and the SNLF junctures are found to be 2 to 3 drag counts lower at the efficient cruise condition. The final analysis indicates that the baseline has a 4% higher cruise efficiency than the SNLF geometry at the efficient flight condition. The reasons are discussed, along with the other notable benefits of SNLF airfoils for this application, such as eliminating the need for a complex high-lift system.For this SNLF sailplane, an SNLF airfoil is applied to the resized wing of a high-performance sailplane and then compared with the Schempp-Hirth Ventus-3. As part of the preparation for the analysis, airfoil polars are compared with wind tunnel data to validate the methods and are found to have good agreement aside from the largest flap deflection. The sailplane comparisons are then made, with visualizations, performance results, and comparisons of the drag associated with the wing-body and wing-winglet juncture drag. While the fundamental aerodynamic characteristics are comparable to the Ventus-3, the CFD analysis predicts the SNLF sailplane has a 1.1% higher maximum lift-to-drag ratio. In addition, carrying ballast in weaker conditions presents gains of over 5% in cross-country speed.The design case of an MD 500E tail rotor was the last application considered. A baseline rotor was defined, and then the SNLF rotor was slowed down by 20% due to the higher maximum lift coefficient of the SNLF airfoil and the constraint of matching the maximum thrust produced in hover. Results indicate that an SNLF tail rotor would provide performance benefits of the baseline in almost all situations, including if the boundary layers are fully turbulent, such as due to premature transition from leading edge erosion. Forward flight predictions indicate that the SNLF rotor requires upwards of 10% less power than the baseline, even with a noisy inflow; however, the pitching moment loads from the SNLF rotor are notably higher. While no analysis is performed, the potential benefit of reducing tail rotor noise is discussed.
- 일반주제명
- Friction
- 일반주제명
- Aviation
- 일반주제명
- Pressure distribution
- 일반주제명
- Turbulence models
- 일반주제명
- Reynolds number
- 일반주제명
- Fluid mechanics
- 기본자료저록
- Dissertations Abstracts International. 86-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798346384267
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a600
■1001 ▼aAxten, Christopher J.
■24510▼aEvaluation of the Slotted, Natural-Laminar-Flow Airfoil Concept for Several Aeronautical Design Applications
■260 ▼a[Sl]▼bThe Pennsylvania State University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a220 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-05, Section: B.
■500 ▼aAdvisor: Maughmer, Mark D.
■5021 ▼aThesis (Ph.D.)--The Pennsylvania State University, 2024.
■520 ▼aThe slotted, natural-laminar-flow (SNLF) airfoil is a low-drag, high-lift airfoil concept that has been explored for commercial aviation applications. This work seeks to determine the benefits of SNLF airfoils for three other aeronautical design problems: a light business jet, a high-performance sailplane, and a light-helicopter tail rotor. For each case, a baseline geometry is developed that provides a fair representation of an effective natural-laminar-flow (NLF) solution for the given application. An SNLF geometry is then designed with the parameters tailored to utilize the strengths of SNLF airfoils while keeping realistic constraints on the geometry and design process. The aerodynamic performance of the baseline and SNLF solutions are then evaluated with transitional RANS CFD.An SNLF light business jet is designed based on the HondaJet. Airfoil selection for the SNLF and baseline geometries is discussed, along with the sizing steps that lead to an 8% reduction in wing area for the SNLF aircraft. Transition via Gortler instabilities is considered and analyzed and is found to have a negligible effect on the performance of the SNLF aircraft. Interference drag from the wing-fuselage and wing-winglet junctures is quantified, and the SNLF junctures are found to be 2 to 3 drag counts lower at the efficient cruise condition. The final analysis indicates that the baseline has a 4% higher cruise efficiency than the SNLF geometry at the efficient flight condition. The reasons are discussed, along with the other notable benefits of SNLF airfoils for this application, such as eliminating the need for a complex high-lift system.For this SNLF sailplane, an SNLF airfoil is applied to the resized wing of a high-performance sailplane and then compared with the Schempp-Hirth Ventus-3. As part of the preparation for the analysis, airfoil polars are compared with wind tunnel data to validate the methods and are found to have good agreement aside from the largest flap deflection. The sailplane comparisons are then made, with visualizations, performance results, and comparisons of the drag associated with the wing-body and wing-winglet juncture drag. While the fundamental aerodynamic characteristics are comparable to the Ventus-3, the CFD analysis predicts the SNLF sailplane has a 1.1% higher maximum lift-to-drag ratio. In addition, carrying ballast in weaker conditions presents gains of over 5% in cross-country speed.The design case of an MD 500E tail rotor was the last application considered. A baseline rotor was defined, and then the SNLF rotor was slowed down by 20% due to the higher maximum lift coefficient of the SNLF airfoil and the constraint of matching the maximum thrust produced in hover. Results indicate that an SNLF tail rotor would provide performance benefits of the baseline in almost all situations, including if the boundary layers are fully turbulent, such as due to premature transition from leading edge erosion. Forward flight predictions indicate that the SNLF rotor requires upwards of 10% less power than the baseline, even with a noisy inflow; however, the pitching moment loads from the SNLF rotor are notably higher. While no analysis is performed, the potential benefit of reducing tail rotor noise is discussed.
■590 ▼aSchool code: 0176.
■650 4▼aFriction
■650 4▼aAviation
■650 4▼aPressure distribution
■650 4▼aTurbulence models
■650 4▼aReynolds number
■650 4▼aFluid mechanics
■690 ▼a0204
■71020▼aThe Pennsylvania State University.
■7730 ▼tDissertations Abstracts International▼g86-05B.
■790 ▼a0176
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164452▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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