• Title/Summary/Keyword: 실속 후 모델

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Optimum Shape Design of Counter-rotating Wind Turbine System (상반회전 풍력발전 시스템의 설계형상 최적화에 관한 연구)

  • Lee, Ju-Young;Jung, Sung-Nam;Song, Seung-Ho;Kim, Dong-Yong
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.373-375
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    • 2003
  • 상반회전 풍력발전 시스템의 경우 전방에 위치한 로터의 후류 효과를 적절히 반영하여 설계에 이용해야 한다. 본 연구에서는 이러한 로터의 후류효과 및 블레이드의 실속후 모델을 고려하여 30kW급 상반회전시스템의 설계형상에 대한 검토연구를 수행하였다 기본공력이론은 모멘텀 이론과 2차원 준정상 공기력 이론을 통합한 형태를 사용하였다. 로터의 후류영향을 고려하기 위해 축소형 풍차 블레이드 모델에 대한 풍동시험 결과를 적절히 이용하며, 이로부터 보조로터를 지난 후류의 축속도 및 각속도 성분을 결정하였다. 최종적으로 상반회전 시스템의 로터 반경 및 상호 이격거리 등을 고려한 성능해석을 수행하고 이로부터 최적 설계형상에 대한 파라미터 연구결과를 제시하였다.

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Software Development for the Performance Analysis of the HAWT based on BEMT (BEMT를 적용한 수평축 풍력터빈 성능해석 소프트웨어의 개발)

  • Kim, Beom-Seok;Nam, Cheong-Do;Lee, Young-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.11a
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    • pp.575-578
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    • 2005
  • The optimum design and the performance analysis software called POSEIDON for the HAWT (Horizontal Axis Wind Turbine) was developed by use of BEMT. The Prandtl's tip loss theory was adopted to consider the blade tip loss. The lift and the drag coefficient of S-809 airfoil were predicted via X-FOIL and also the post stall characteristics of S-809 were estimated by the Viterna's equations. All the predicted aerodynamic characteristics are fairly well agreed with the wind tunnel test results, performed by Sommers in Delft university of technology. The rated power of the testing rotor is 20kW(FIL-20) at design conditions. The experimental aerodynamic parameters and the X-FOIL data were used for the power prediction of the FIL-20 respectively. The comparison results shows good agreement in power prediction.

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Software Development for the Performance Analysis of the HAWT based on BEMT (BEMT를 적용한 수평축 풍력터빈 성능해석 소프트웨어의 개발)

  • Kim, Beom-Seok;Lee, Young-Ho
    • New & Renewable Energy
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    • v.1 no.4 s.4
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    • pp.38-42
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    • 2005
  • The optimum design and the performance analysis software called POSEIDON for the HAWT [Horizontal Axis Wind Turbine] was developed by use of BEMT. The Prandtl's tip loss theory was adopted to consider the blade tip loss. The lift and the drag coefficient of S-809 airfoil were predicted via X-FOIL and also the post stall characteristics of S-809 were estimated by the Viterna's equations. All the predicted aerodynamic characteristics are fairly well agreed with the wind tunnel test results, performed by Sommers in Delft university of technology. The rated power of the testing rotor is 20kW[FIL-20] at design conditions. The experimental aerodynamic parameters and the X-FOIL data were used for the power prediction of the FIL-20 respectively. The comparison results shows good agreement in power prediction.

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Study on the Optimum Rotor Blade Design of the 5 kW HAWT by BEMT (BEMT를 이용한 5 kW급 수평축 풍력발전용 로터 블레이드 형상 최적설계에 관한 연구)

  • Kim, Mun-Oh;Lee, Min-Woo;Kim, Chang-Goo;Kim, Tae-Hyung;Lee, Young-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.444-447
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    • 2009
  • The optimum design and the performance analysis software called POSEIDON for the HAWT (Horizontal Axis Wind Turbine) was developed by use of BEMT. The Prandtl's tip loss theory was adopted to consider the blade tip loss. The aerodynamic characteristics of NACA 63415 airfoils were predicted via X-FOIL and the post stall characteristics were estimated by the Viterna's equations. All the predicted aerodynamic characteristics are fairly well agreed with the Velux wind tunnel test results. The rated power of the testing rotor is 5kW at design conditions. The power, estimated by use of predicted lift and drag coefficient via X-FOIL becomes a little higher than experimental one.

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Study on the Optimum Rotor Blade Design of the 1 kW HAWT by BEMT (BEMT를 이용한 1 kW급 수평축 풍력발전용 로터 블레이드 형상 최적설계에 관한 연구)

  • Lee, Min-Woo;Kim, Jeong-Hwan;Kim, Jung-Ryul
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.4
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    • pp.356-362
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    • 2007
  • The optimum design and the performance analysis software called POSEIDON for the HAWT (Horizontal Axis Wind Turbine) was developed by use of BEMT. The Prandtl's tip loss theory was adopted to consider the blade tip loss. The aerodynamic characteristics of NACA 63-415 airfoils were predicted via X-FOIL and the post stall characteristics were estimated by the Viterna's equations. All the predicted aerodynamic characteristics are fairly well agreed with the Velux wind tunnel test results. The rated power of the testing rotor is 1 kW at design conditions. The power, estimated by use of predicted lift and drag coefficient via X-FOIL becomes a little higher than experimental one.

A Dynamic Simulation and Real-Time Linear Simulation for Mid-Class Civil Aircraft Turbofan Engine (중형항공기용 터보팬 엔진의 동적모사 및 실시간 선형모사)

  • 공창덕;기자영;고광웅
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 1998.04a
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    • pp.6-6
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    • 1998
  • 중형항공기용 터보팬 엔진의 정상상태 및 천이상태 성능을 해석하고 제어기 설계를 위한 선형모델을 구하였다. 정상상태 성능해석은 설계점으로 선정한 지상정지조건과 최대상승조건(Mach=0.78, 고도=36000ft) 및 순항조건(Mach=0.78, 고도=39000ft)을 고려하였으며, 저압압축기의 공회전 상태에서 최대 회전속도까지의 부분부하성능해석을 수행하였다. 부분부하 성능해석 결과 90% RPM 조건에서 가장 연료소모율이 적어 경제적임을 알 수 있다. 동적 성능모사는 각각의 대기조건에서 연료가 Step 증가, Ramp 증가 및 감소, Step 증가 후 Ramp 감소하는 경우에 대해 수행하였다. 모사결과 고려된 모든 조건에서 연료의 Step 증가시 고압압축기의 터빈입구온도가 제한온도를 초과하여, 보다 빠른 가속과 최적의 성능을 위해서는 적절한 제어가 필요함을 알 수 있었다. 또한 최대상승조건에서 연료를 Step 증가시킬 경우 고압압축기에서 실속이 발생하여 이에 대한 대책도 필요함을 알 수 있었다.

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Aerodynamic Performance Prediction of a Counter-rotating Wind Turbine System with Wake Effect (후류영향을 고려한 상반회전 풍력발전 시스템의 공력성능 예측에 관한 연구)

  • Dong, Kyung-Min;Jung, Sung-Nam
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.7
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    • pp.20-28
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    • 2002
  • In this paper, the aerodynamic performance prediction of a 30kW counter-rotating (C/R) wind turbine system has been made by using the momentum theory as well as the two-dimensional quasi-steady strip theory with special care on the wake and the post-stall effects. In order to take into account the wake effects in the performance analysis, the wind tunnel test data obtained for a scaled blade are used. Both the axial and rotational inductions behind the auxiliary rotors are determined through the wake model. In addition, the optimum chord and twist distributions along the blades are obtained from the Glauert's optimum actuator disk model considering the Prandtl's tip loss effect. The performance results of the counter-rotating wind turbine system are compared with those of the conventional single rotor system and demonstrated the effectiveness of the counter-rotating wind turbine system.

Software Development to Predict the Power Characteristics of a Horizontal Axis Wind Turbine Rotor (수평축 풍력발전용 로터 성능해석 프로그램 개발)

  • Kim, Beom-Seok;Nam, Chung-Do;Kim, You-Taek;Kim, Jin-Gu;Lee, Young-Ho
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.11a
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    • pp.168-169
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    • 2005
  • The optimum design and the performance analysis software called POSEIDON for the HAWT (Horizontal Axis Wind Turbine) was developed by use of BEMT. The Prandtl's tip loss theory was adopted to consider the blade tip loss. The lift and the drag coefficient of S-809 airfoil were predicted via X-FOIL and also the post stall characteristics of S-809 were estimated by the Viterna's equations. All the predicted aerodynamic characteristics are fairly well agreed with the wind tunnel test results, performed by Sommers in Delft university of technology. The rated power of the testing rotor is 20kW(FIL-20) at design conditions. The experimental aerodynamic parameters and the X-FOIL data were used for the power prediction of the FIL-20 respectively. The comparison results shows good agreement in power prediction.

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A Study on the Configuration Design and the Performance Analysis of the 20kW HAWT based on BEMT (BEMT를 적용한 20kW 수평축 풍력터빈 형상설계 및 성능해석)

  • Kang, Ho-Keun;Nam, Cheong-Do;Lee, Young-Ho;Kim, Beom-Seok
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.6
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    • pp.669-676
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    • 2006
  • The optimum design and the performance analysis software called POSEIDON for the HAWT (Horizontal Axis Wind Turbine) is developed by use of BEMT, which is the standard computational technique for prediction of power curves of wind turbines. The Prandtl's tip loss theory is adopted to consider the blade tip loss. The lift and the drag coefficient of S-809 airfoil are predicted via X-FOIL and the post stall characteristics of S-809 also are estimated by the Viterna's equations.$^{[13]}$ All the predicted aerodynamic characteristics are fairly well agreed with the wind tunnel test results. performed by Sommers in Delft university of technology. The rated power of the testing rotor is 20kW(FIL-20) at design conditions. The experimental aerodynamic parameters and the X-FOIL data are used for the power Prediction of the FIL-20 respectively The comparison results shows good agreement in power prediction.

Development of Health Promotion Program through IUHPE - Possibilities of collaboration in East Asia - (IUHPE를 통한 건강 증진 프로그램의 발달-동아시아권의 공동연구의 가능성-)

  • Moriyama, Masaki
    • Proceedings of The Korean Society of Health Promotion Conference
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    • 2004.10a
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    • pp.1-16
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    • 2004
  • This paper considers the possibilities of health promotion from the following perspectives; (1) IUHPE, (2) socio-cultural similarities, (3) action research, and (4) learning from our past. 1. The IUHPE values decentralized activities through regions, and countries such as Japan, Korea, Hong Kong, Taiwan and China belong to NPWP region. Since IUHPE World Conference was held in Japan in 1995, Japan used to occupy more than 60% of NPWP membership. After 2001, membership is increasing rapidly in Chinese speaking sub-region. The transnational collaboration is still in its beginning phase. 2. Confucianism is one of key points. Confucian tradition should not be seen only as obstacles but as advantages to seek a form of health promotion more acceptable in East Asia. 3. Within the new public health framework, people are expected to create and live their health. However, especially in Japan, the tendency of 'lacking of face-to-face explicit interactions' is still common at health-promotion settings as well as academic settings. Therefore, the author tried participatory approaches such as asking WlFY (interactive questions designed for subjects to review their daily life and environment) and as introducing round table interactions. So far, majority of participants welcome new trials. 4. The following social phenomena are comparatively discussed after Japanese invasion and occupation of Korea ended in 1945; ·status of oriental medicine, ·separation of dispensary services, and ·health promotion specialist as a national license. In contrast to Japanese' tendency of maintaining the status quo and postponing of substantial social change, trend toward rapid and dynamic social changes are more commonly observed in Korea. Although all of above possibilities are still in their beginning stages, they are going to offer interesting directions waiting for further challenges and accompanying researches.

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