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Physics-Based Models for Rotor Aerodynamics under Adverse Weather
Physics-Based Models for Rotor Aerodynamics under Adverse Weather
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105328
- ISBN
- 9798263325022
- DDC
- 629.13
- 서명/저자
- Physics-Based Models for Rotor Aerodynamics under Adverse Weather
- 발행사항
- [Sl] : Georgia Institute of Technology, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 280 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: A.
- 주기사항
- Advisor: Sankar, Lakshmi N.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2025.
- 초록/해제
- 요약As the demand for next-generation air mobility systems grows across both civilian and military domains, their reliable operation under a range of environmental conditions becomes essential. Vertical lift systems, including multirotors, eVTOLs, and other compact rotorcrafts (drones), offer unique operational flexibility due to their ability to take off and land vertically, hover, and perform various tasks. However, these systems are particularly vulnerable to adverse weather conditions such as rain and icing, where even minimal accumulation of water or ice on lifting and non-lifting surfaces can lead to significant aerodynamic performance degradation.This dissertation develops and benchmarks integrated high-fidelity and low-fidelity computational frameworks to analyze aerodynamic degradation caused by rain and ice accretion on rotor systems. The emphasis is on delivering robust, physics-informed predictive tools that support early-stage design, performance evaluation, and operational planning for modern rotorcraft.To address existing modeling gaps, a modular modeling framework for highfidelity and computationally efficient low-fidelity methods, is developed to assess the impact of rain and icing on various rotor configurations. The investigation begins with rain effects, enhancing 2-D and 3-D unsteady viscous flow analyses with a tightly coupled water droplet transport model to simulate droplet collection and interaction with the airflow over rotors. This coupled solver is applied to multiple rotor configurations: including a single main rotor (S-76), coaxial (Harrington rotor-1), tandem (Sweet), and a notional quadrotor, under hover and forward flight conditions. The model accounts for the drag force imposed by the airstream on water droplets and the subsequent reaction forces exerted by the droplets on the airflow. This approach is found to be better suited for assessing adverse effects of rain and icing conditions on multirotor configurations with nonlinear wake interactions, eliminating the needs for airfoil drag polars, tip loss models, and empirical compressibility corrections.For icing scenarios, both high- and low-fidelity approaches are employed to simulate ice accretion and assess performance degradation. Case studies include a twobladed teetering tail rotor, an 81% scaled version of the Bell APT70 drone rotor tested at Universite du Quebec a Montreal (UQAM), and a NASA eVTOL propeller configuration. Results from the low-fidelity blade element momentum theory (BEMT) approach are benchmarked against high-fidelity Navier-Stokes simulations and validated using experimental data from NASA and UQAM. Simulations show good agreement for rime ice accretion, while discrepancies for glaze ice highlight the limitations of existing roughness and transition models. Sensitivity analyses confirm that environmental variables, such as droplet size, liquid water content, and temperature, play a dominant role in shaping ice morphology and aerodynamic penalties.This work advances physics-based modeling capabilities for predicting the effects of adverse weather on vertical lift air mobility systems. The resulting tools and insights support the design and certification of next-generation rotorcraft capable of safe and resilient operation in all-weather environments.
- 일반주제명
- Aeronautics
- 일반주제명
- Fluid dynamics
- 일반주제명
- Altitude
- 일반주제명
- Water
- 일반주제명
- Fines & penalties
- 일반주제명
- Aviation
- 일반주제명
- Unmanned aerial vehicles
- 일반주제명
- Pressure distribution
- 일반주제명
- Aircraft
- 일반주제명
- Heat transfer
- 일반주제명
- Physics
- 일반주제명
- Aerodynamics
- 일반주제명
- Design
- 일반주제명
- Drones
- 일반주제명
- Surveillance
- 일반주제명
- Reynolds number
- 일반주제명
- Wind shear
- 일반주제명
- Rain
- 일반주제명
- Clouds
- 일반주제명
- Shear stress
- 일반주제명
- Aerospace engineering
- 일반주제명
- Atmospheric sciences
- 일반주제명
- Fluid mechanics
- 일반주제명
- Meteorology
- 일반주제명
- Robotics
- 일반주제명
- Thermodynamics
- 기본자료저록
- Dissertations Abstracts International. 87-05A.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a629.13
■1001 ▼aGahlot, Aishwerya Singh.
■24510▼aPhysics-Based Models for Rotor Aerodynamics under Adverse Weather
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a280 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: A.
■500 ▼aAdvisor: Sankar, Lakshmi N.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2025.
■520 ▼aAs the demand for next-generation air mobility systems grows across both civilian and military domains, their reliable operation under a range of environmental conditions becomes essential. Vertical lift systems, including multirotors, eVTOLs, and other compact rotorcrafts (drones), offer unique operational flexibility due to their ability to take off and land vertically, hover, and perform various tasks. However, these systems are particularly vulnerable to adverse weather conditions such as rain and icing, where even minimal accumulation of water or ice on lifting and non-lifting surfaces can lead to significant aerodynamic performance degradation.This dissertation develops and benchmarks integrated high-fidelity and low-fidelity computational frameworks to analyze aerodynamic degradation caused by rain and ice accretion on rotor systems. The emphasis is on delivering robust, physics-informed predictive tools that support early-stage design, performance evaluation, and operational planning for modern rotorcraft.To address existing modeling gaps, a modular modeling framework for highfidelity and computationally efficient low-fidelity methods, is developed to assess the impact of rain and icing on various rotor configurations. The investigation begins with rain effects, enhancing 2-D and 3-D unsteady viscous flow analyses with a tightly coupled water droplet transport model to simulate droplet collection and interaction with the airflow over rotors. This coupled solver is applied to multiple rotor configurations: including a single main rotor (S-76), coaxial (Harrington rotor-1), tandem (Sweet), and a notional quadrotor, under hover and forward flight conditions. The model accounts for the drag force imposed by the airstream on water droplets and the subsequent reaction forces exerted by the droplets on the airflow. This approach is found to be better suited for assessing adverse effects of rain and icing conditions on multirotor configurations with nonlinear wake interactions, eliminating the needs for airfoil drag polars, tip loss models, and empirical compressibility corrections.For icing scenarios, both high- and low-fidelity approaches are employed to simulate ice accretion and assess performance degradation. Case studies include a twobladed teetering tail rotor, an 81% scaled version of the Bell APT70 drone rotor tested at Universite du Quebec a Montreal (UQAM), and a NASA eVTOL propeller configuration. Results from the low-fidelity blade element momentum theory (BEMT) approach are benchmarked against high-fidelity Navier-Stokes simulations and validated using experimental data from NASA and UQAM. Simulations show good agreement for rime ice accretion, while discrepancies for glaze ice highlight the limitations of existing roughness and transition models. Sensitivity analyses confirm that environmental variables, such as droplet size, liquid water content, and temperature, play a dominant role in shaping ice morphology and aerodynamic penalties.This work advances physics-based modeling capabilities for predicting the effects of adverse weather on vertical lift air mobility systems. The resulting tools and insights support the design and certification of next-generation rotorcraft capable of safe and resilient operation in all-weather environments.
■590 ▼aSchool code: 0078.
■650 4▼aAeronautics
■650 4▼aFluid dynamics
■650 4▼aAltitude
■650 4▼aWater
■650 4▼aFines & penalties
■650 4▼aAviation
■650 4▼aUnmanned aerial vehicles
■650 4▼aPressure distribution
■650 4▼aAircraft
■650 4▼aHeat transfer
■650 4▼aPhysics
■650 4▼aAerodynamics
■650 4▼aDesign
■650 4▼aDrones
■650 4▼aSurveillance
■650 4▼aReynolds number
■650 4▼aWind shear
■650 4▼aRain
■650 4▼aClouds
■650 4▼aShear stress
■650 4▼aAerospace engineering
■650 4▼aAtmospheric sciences
■650 4▼aFluid mechanics
■650 4▼aMeteorology
■650 4▼aRobotics
■650 4▼aThermodynamics
■690 ▼a0389
■690 ▼a0605
■690 ▼a0538
■690 ▼a0725
■690 ▼a0204
■690 ▼a0557
■690 ▼a0771
■690 ▼a0348
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-05A.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360254▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


