• Title, Summary, Keyword: Propulsion performance

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A Study on Performance Simulation of Propulsion System for KT-1 (KT-1 기본 훈련기의 추진기관 비행성능 해석연구)

  • 오성환;장현수;기덕종
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.225-229
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    • 2003
  • The exact performance simulation of propulsion system is a key element in the prediction of the aircraft performance. The specification performance analysis using the installed loss of KT-1 showed a large difference with the engine performance measured during the flight tests. This indicates that a method to estimate the more exact performance is needed. The study on the performance simulation with performance map correction along the engine operating line shows the good consistent results through all the flight conditions and engine conditions. The correction factors of the map were resulted from the comparative analysis between the flight test and the simulation of installed engine performance.

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SHIP RESISTANCE AND PROPULSION PERFORMANCE TEST USING HYBRID MESH AND SLIDING MESH (Hybrid mesh 및 sliding mesh를 이용한 선박 저항추진 성능 시험)

  • Park, Bum-Jin;Rhee, Shin-Hyung
    • 한국전산유체공학회:학술대회논문집
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    • pp.77-83
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    • 2009
  • In this study, we conducted resistance and propulsion performance test of ship composed of the Resistance Test, Propeller Open Water Test and Self Propulsion Test using the CFD(Computational Fluid Dynamics). We used commercial RANS(Reynolds Averaged Navier Stokes equation) solver, as a calculating tool. The unstructured grids were used in a bow and stern of ship, having complex shape, for a convenience of generating grids, and the structured grids were adopted in a central hull and rest of hull having a relatively simple shape which is called hybrid grid method. In addition, The sliding mesh method was adopted to rotate a propeller directly in the Propeller Open Water and Self Propulsion Test. The Resistance Test and Self Propulsion Test were calculated using Volume of Fluid (VOF) model and considering a free surface. And all The three cases were applied realizable k-epsilon model as the turbulence model. The results of calculations were verified for the suitability of calculations by comparing MOERI's EFD results.

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Study on Performance Prediction of Electric Propulsion System for Multirotor UAVs (멀티로터 무인항공기의 전기추진계통 성능예측에 대한 연구)

  • Jeong, Jinseok;Byun, Youngseop;Song, Woojin;Kang, Beomsoo
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.6
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    • pp.499-508
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    • 2016
  • This paper describes a study of performance prediction of an electric propulsion system for multirotor UAVs. The electric propulsion system consists of motors, propellers, batteries and speed controllers, and significantly affects performance characteristics of the platform. The performance of the electric propulsion system for multirotor UAVs was predicted using an analytical model derived from the characteristics of each component, operation experiments and statistical analyses. Ground performance tests and endurance flights were performed to verify the reliability of the proposed performance prediction method. A quadrotor platform was designed to demonstrate the parcel delivery service used in the endurance flight. From the result of verification tests, it was confirmed that the proposed method has a good agreement.

Construction and Performance Test of Ground Test Facility for the Hypersonic Propulsion System (극초음속 추진기관 지상시험 설비 구축 및 성능 시험)

  • Lee, Hyoung-Jin;Lee, Bok-Jik;Kim, Sei-Hwan;Jeung, In-Seuck
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.41-44
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    • 2007
  • Ground test facility for the hypersonic propulsion system was designed, constructed and performance test was conducted. The design point was selected using quasi,1-Dimensional CFD analysis before the conceptual design for construction of hypersonic facility After that, specific designs for performance and components were completed using unit analysis CFD code and performance tests were conducted for the various operation conditions.

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The Study of Propulsion Performance Model for Reciprocating Engine Aircraft (소형 왕복엔진 항공기용 추진성능모델 연구)

  • Choi, Won;Kim, Kwang-Hae;Kim, Ji-Hong;Lee, Won-Joong
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.578-585
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    • 2012
  • Reciprocating engine is widely used for small propeller driven aircraft. because it is the superior efficiency and low price. Currently, reciprocating engine is used for the development of KC-100, LSA, PAV, UAV in domestic. In this study, Naturally aspirated engine and turbocharger engine performance model is developed. The propeller is designed and analyzed at cruise condition of reciprocating engine aircraft using optimum method, the propeller performance model is developed. The Integrated propulsion performance model is developed, through the matching with engine and propeller performance model, for small reciprocating engine aircraft performance analysis.

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Performance of Laser-driven In-Tube Accelerator (레이저 구동 관내 가속장치 (LITA)의 성능에 대한 연구)

  • 김수겸;정인석
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.39-42
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    • 2003
  • We studied the vertical launch performance of the Laser-driven In-Tube Accelerator (LITA). This device is primarily characterized by accelerating a projectile in a tube. Owing to the confinement effect, the thrust performance is enhanced. The driver gas can be specified and its pressure be turned so that the impulse performance is optimized. In the experiments, a 3.0-gram projectile was vertically launched. The effects of the projectile exit condition, the laser beam incident direction and the driver gas species were experimentally studied.

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Biomechanical Characteristics of Hand Rim Contact Orientation During Wheelchair Propulsion: A Literature Review (표준형 휠체어 추진시 휠손잡이 촉수위치 특성에 관한 연구)

  • Kwon, Hyuk-Cheol;Kong, Jin-Yong
    • Physical Therapy Korea
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    • v.9 no.2
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    • pp.19-32
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    • 2002
  • The purpose of this paper is to provide the reader with a pertinent information and research trends of biomechanics in wheelchair propulsion. Biomechanical studies for wheelchair propulsion mainly focus on the most suitable propulsion performance and methods for preventing upper extremity injuries. Recent issues have concentrated on wheelchair propulsion style and cycle mainly because of the high prevalence of repetitive strain injuries in the upper extremely such as shoulder impingement and carpel tunnel syndrome. Optimizing wheelchair propulsion performances as well as medical reflections are presented throughout the review. Information on the underlying musculoskeletal mechanisms of wheelchair propulsion has been introduced through a combination of data collection under experimental conditions and a more fundamental mathematical modelling approach. Through a synchronized analysis of the movement pattern and muscular activity pattern, insight has been gained in the wheelchair propulsion dynamics of people with a different level of disability (various level of physical activity and functional potential). Through mathematical modelling simulation, and optimization (minimizing injury and maximizing performance), underlying musculoskeletal mechanisms during Wheelchair propulsion is investigated.

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Numerical Study on Propulsion Performance Enhancement of Superdetonative mode Ram Accelerator by using strong mixture

  • Sung, Kun-Min;Jeung, In-Seuck
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.519-524
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    • 2008
  • A numerical study is conducted to investigate propulsion performance enhancement based on S225 experiment case of ISL(French-German Research Institute of Saint-Louis)'s superdetonative ram accelerator. For govern equation, multi-species Navier-Stokes equation coupled with Baldwin-Lomax turbulence modeling is used. Govern equation is discretized by Roe's FDS and integrated by LU-SGS time integration. Detailed chemical reaction about $H_2/O_2/CO_2$ for high pressure is considered. $2H_2+O_2+2.5CO_2$ mixture was used for propellant gas. For the same over-driven factor, the launching speed of computation was faster than one of S225. Another configuration and condition of S225 was applied. A flame structure is very different from S225. For strong mixture case, it shows ignition by viscous effect. Acceleration and speed increment is higher than S225 computation and experiment. By using more strong mixture, propulsion performance was enhanced.

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Aero Engine in the New Century -Challenge in Technology and Business-

  • Sekido, Toshinori
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.440-448
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    • 2004
  • Toasting the 100 year anniversary of controlled, powered flight, the propulsion system used on today's aircraft represents the evolution of jet propulsion based on the gas turbine, first conceived by Whittle and Von Ohain about 70 years ago. In that period, propulsion system concepts have evolved through turbo-props, turbo-jets, low by-pass ratio(BPR) turbofans to today's high BPR 2-shaft and 3-shaft turbofans. Also, this period has seen remarkable progress in the performance, reliability environmental compatibility of these propulsion systems.(omitted)

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Performance analysis of dynamic positioning system with loss of propulsion power of T/S NARA (실습선 나라호의 추진력 상실에 따른 동적위치제어시스템의 성능 분석)

  • LEE, Jun-Ho;KONG, Kyeong-Ju;JUNG, Bong-Kyu
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.54 no.2
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    • pp.181-187
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    • 2018
  • In order for the probe to perform ocean exploration and survey research, it is necessary to adjust the position of the ship as desired by dynamic positioning system. The dynamic positioning system of T/S NARA is applied to K-POS dynamic positioning system of Kongsberg, which makes maintaining the ship's position, changing position and heading control possible. T/S NARA is not capable of dynamic positioning if one or more propulsive forces are lost with DP Level One. However, it is predicted that dynamic positioning can be achieved even at the time of missing one thrust in a good sea condition. Therefore, we want to analyze the effect of each propulsion on the performance of dynamic position system. When one of the bow thruster and azimuth thrusters lost their propulsion, maintaining the ship's position, changing position and heading control performance were compared and analyzed. If the situation occurred disable from using the bow thruster, they can not maintain ship's position. Azimuth thruster was influential for the ship's position control and bow thruster was influential in heading control. The excellent dynamic positioning performance can be achieved, considering the propulsion power that will have a impact on each situation in the future.