• Title/Summary/Keyword: Small-scale Rotor Blade

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Experimental Study on the Small-Scale Rotor Hover Performance in Partial Ground Conditions (부분적 지면조건 하에서의 소형 로터 블레이드 제자리 비행 성능에 대한 실험적 연구)

  • Seo, Jin-Woo;Lee, Byoung-Eon;Kang, Beom-Soo;Oh, Se-Jong;Yee, Kwan-Jung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.1
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    • pp.12-21
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    • 2010
  • This paper focuses on the hover performance experiment of a small-scale single rotor in partial ground conditions. In this study, small-scale rotor blade rotating device and floor panel are used to include partial ground effect. Thrust and torque were measured with varying collective pitch angles at fixed rotor rotating speed. The overlap distance between rotor and ground is d, the rotor diameter is D. It was shown that the ground effects have little effect on the rotor performance until d/D is 0.25. Four blade rotor has more increased thrust and more reduced power than those of two blade rotor because of stronger ground effect. In addition, it was also found that the thrust increases as a collective pitch angle become smaller. Based on these experiment results, we deduced new empirical equation considered blade number and partial ground effect.

Development and Verification of Small-Scale Rotor Hover Performance Test-stand (소형 로터 블레이드의 제자리 비행 성능 시험장치 개발 및 검증)

  • Lee, Byoung-Eon;Seo, Jin-Woo;Byun, Young-Seop;Kim, Jeong;Yee, Kwan-Jung;Kang, Beom-Soo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.10
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    • pp.975-983
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    • 2009
  • This paper presents the work being carried out in order to deduce hover performance of a small-scale single rotor blade as a preliminary study of a small coaxial rotor helicopter development. As an initial research, a test stand capable of measuring thrust and torque of a small-scale rotor blade in hover state was constructed and fabricated. The test stand consists of three parts; a rotating device, a load measuring sensor and a data acquisition system. Thrust and torque were measured with varying collective pitch angle at fixed RPM. Through this research, hover performance tests were conducted for a small-scale single rotor blade operating in low Reynolds number ($Re\;{\approx}3{\times}10^5$), as well as for verifying the test stand itself for acquiring hover performance.

Prediction of Hover Performance on Development of Small-Scale UAV using Numerical and Experimental Approach (실험을 통한 소형 무인헬리콥터의 공력인자 도출 및 제자리 비행 성능 예측)

  • Lee, Byoung-Eon;Kim, Sang-Deok;Byun, Young-Seop;Song, Jun-Beum;Kang, Beom-Soo
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.2548-2553
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    • 2008
  • Prediction of the rotor blade performance is important for determining design factors such as weight and size in development of a small-scale helicopter. Generally, prediction of helicopter performance means the estimation of the power required for a given flight condition. However, due to lack of test data and analyzed results for small-scale rotor blade operated at low Reynolds numbers ($Re{\approx}10^5$), this is not an easy task. As an initial research, this work performs a modeling of a single rotor configuration with FLIGHTLAB and a experimental research with rotor test bed. In this process, we performed small-scale isolated single rotor by experimental and numerical method and achieved good agreement of the hover performance on the test data and simulation results.

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Design of Mach-Scale Blade for LCH Main Rotor Wind Tunnel Test (소형민수헬기 주로터 풍동시험을 위한 마하 스케일 블레이드 설계)

  • Kee, YoungJung;Park, JoongYong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.46 no.2
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    • pp.159-166
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    • 2018
  • In this study, the internal structural design, dynamic characteristics and load analyses of the small scaled rotor blade required for LCH(Light Civil Helicopter) main rotor wind tunnel test were carried out. The test is performed to evaluate the aerodynamic performance and noise characteristics of the LCH main rotor system. Therefore, the Mach-scale technique was appled to design the small scaled blade to simulate the equivalent aerodynamic characteristics as the full scale rotor system. It is necessary to increase the rotor speed to maintain the same blade tip speed as the full scale blade. In addition, the blade weight, section stiffness, and natural frequency were scaled according to the Mach-type scaling factor(${\lambda}$). For the design of skin, spar, torsion box, which are the main components of the blade, carbon and glass fiber composite materials were adopted, and composite materials are prepreg types that can be supplied domestically. The KSec2D program was used to evaluate the section stiffness of the blade. Also, structural loads and dynamic characteristics of the Mach scale blade were investigated through the comprehensive rotorcraft analysis program CAMRADII.

Detailed Design of an Active Rotor Blade for Reducing Helicopter Vibratory Loads

  • Natarajan, Balakumaran;Eun, Won-Jong;Shin, Sang-Joon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.10a
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    • pp.236-241
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    • 2011
  • An active trailing-edge flap blade named as Seoul National University Flap (SNUF) blade is designed for reducing helicopter vibratory loads and the relevant aeroacoustic noise. Unlike the conventional rotor control, which is restricted to 1/rev frequency, an active control device like the present trailing-edge flap is capable of actuating each individual blade at higher harmonic frequencies i.e., higher harmonic control (HHC) of rotor. The proposed blade is a small scale blade and rotates at higher RPM. The flap actuation components are located inside the blade and additional structures are included for reinforcement. Initially, the blade cross-section design is determined. The aerodynamic loads are predicted using a comprehensive rotorcraft analysis code. The structural integrity of the active blade is verified using a stress-strain recovery analysis.

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Structural Integrity through Aerodynamic Analysis and Structural Test for Small Wind Turbine Composite Blade (공력해석 및 구조시험을 통한 소형 복합재 블레이드의 구조 안전성 평가)

  • Jang, Yun-Jung;Jeong, Jin-Hwan;Lee, Jang-Ho;Kang, Ki-Weon
    • The KSFM Journal of Fluid Machinery
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    • v.15 no.2
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    • pp.63-68
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    • 2012
  • This paper deals with the aerodynamic analysis and structural test under estimated loading condition for small composite blade, which is utilized in dual rotor wind turbine system. Firstly, the front and rear blades of dual rotor wind turbine system were modeled using reverse engineering method. And using finite volume method, the aerodynamic forces were analyzed at the rated and cutout wind speed to identify the pressure distribution on blades. And then, the full scale structural tests were conducted according to load and strength based methodology in IEC 61400-2 to identify the structural integrity of composite blade.

The Vibration Characteristic and Fatigue Life Estimation of a Small-scaled Hingeless Hub System with Composite Rectangular Blades (복합재료 기준형 블레이드를 장착한 축소 힌지없는 허브시스템의 진동특성과 피로수명 예측)

  • Song, Keun-Woong;Kim, Jun-Ho;Kim, Duck-Kwan;Joo, Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.310-315
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    • 2003
  • This paper described that rotating test and fatigue test of a small-scale hingeless hub system with composite rectangular blades. Generally Rotating stability and fatigue test technique is one of Key-technology on test and evaluation for helicopter rotor system Rotating test of hingeless rotor system was achieved by means of rotor vibration characteristic and aeroelastic stability test GSRTS, equipped with hydraulic actuator and 6-component rotating balance was used to test hingeless rotor system especially for an observation of blade motion including flawing, lagging and feathering. Rotating test was done in hover and forward flight condition. Small-scaled blade fatigue test condition was determined by blade load analysis with the reference table of composite materials(S-N curve). Fatigue test bench was developed for the estimation of blade fatigue life, and tested its characteristic.

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Design of KUH Main Rotor Small-scaled Blade (KUH 주로터 축소 블레이드 설계)

  • Kim, Do-Hyung;Kim, Seung-Ho;Han, Jung-Ho
    • Aerospace Engineering and Technology
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    • v.8 no.1
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    • pp.32-41
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    • 2009
  • In this study, scale-down design of full-scale Korean Utility Helicopter (KUH) main rotor blade has been investigated. The scaled model system were designed for the measurement of aerodynamic performance, tip vortex and noise source. For the purpose of considering the same aerodynamic loads, the Mach-scale method has been applied. The Mach-scaled model has the same tip Mach number, and it also has the same normalized frequencies. That is, the Mach-scaled model is analogous to full-scale model in the view point of aerodynamics and structural dynamics. Aerodynamic scale-down process could be completed just by adjusting scaling dimensions and increasing rotating speed. In the field of structural dynamics, design process could be finished by confirming the rotating frequencies of the designed blade with the stiffness and inertial properties distributions produced by sectional design. In this study, small-scaled blade sectional design were performed by applying domestic composite prepregs and structural dynamic characteristics of designed model has been investigated.

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Free-Stream Turbulence Effect on the Heat (Mass) Transfer Characteristics on a Turbine Rotor Surface (자유유동 난류강도가 터빈 동익 표면에서의 열(물질)전달 특성에 미치는 영향)

  • Lee, Sang-Woo;Park, Jin-Jae;Kwon, Hyun-Goo;Park, Byung-Kyu
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.1442-1446
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    • 2004
  • The heat (mass) transfer characteristics on the blade surface of a first-stage turbine rotor cascade has been investigated by employing the naphthalene sublimation technique. A four-axis profile measurement system is employed for the measurements of the local heat (mass) transfer coefficient on the curved blade surface. The experiments are carried out for two free-stream turbulence intensities of 1.2% and 14.7%. The high free-stream turbulence results in more uniform distributions of heat load on the both pressure and suction surfaces and in an early boundary-layer separation on the suction surface. The heat (mass) transfer enhancement on the suction surface due to the endwall vortices is found to be relatively small under the high free-stream turbulence.

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A Study of Fatigue Load for Rotor Blades of the Utility Helicopter (다목적 헬리콥터 로터 블레이드 피로하중에 대한 연구)

  • Oh, Man-Seok;Kim, Hyun-Duk;Park, Jung-Sun;Gi, Yeong-Jung
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.648-653
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    • 2007
  • In this study, we have generated fatigue load spectrum that is using to prediction of life time for the helicopter rotor blades. We derive utility helicopter missions for the sake of generating load spectrum. Helix and Felix are standard loading sequences which relate to the main rotors of helicopters with articulated and semi-rigid rotors respectively. We got scale factors which is applied to specific case and it did be obtained through the finite element analysis tools. The fatigue life of the rotor blade is estimated by using MSC/Fatigue. We suggest that generated our fatigue load spectrum in conjunction with small utility helicopter should use to rotor blade fatigue test of the korea helicopter program.

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