• Title, Summary, Keyword: 프로펠러 성능추정

Search Result 23, Processing Time 0.046 seconds

Performance analysis of Coaxial Propeller for Multicopter Type PAV (Personal Air Vehicle) (멀티콥터형 PAV(Personal Air Vehicle)의 동축반전 프로펠러에 대한 성능해석)

  • Kim, Young Tae;Park, Chang Hwan;Kim, Hak Yoon
    • Journal of Aerospace System Engineering
    • /
    • v.13 no.3
    • /
    • pp.56-63
    • /
    • 2019
  • Performance analyses were performed on a propeller developed for use in a PAV (Personal Air Vehicle) under 600 kg Maximum Take-Off Weight (MTOW). The actuator disc theory and CFD analyses were used to estimate the hovering time with regards to MTOW variation for a given battery weight. The interference induced power factor kint was introduced to account for the effect of flow interference between the propellers and to estimate the performance of counter-rotating propellers. The Maximum Figure of Merit (FM) value of the propeller pitch was determined and the design RPM range for the required power inversely obtained from the CFD results. Previous research indicate that the flight time of large multi-copter is limited by the available battery energy density. Similarly, the propeller pitch settings and spacing are important factors in reducing the kint value.

A Study on the Propeller Thrust for a Moored Ship (계류중인 선박의 프로펠러 추력 추정에 관한 연구)

  • Ha, M.K.;Song, I.H.;Kim, D.J.;Wee, K.S.;Kim, S.W.
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.34 no.1
    • /
    • pp.50-59
    • /
    • 1997
  • Shipbuilder checks the status of main engine and propeller operation before sea trial. Generally these tests are carried out at a quay during fitting out of the ship. For these tests the operator has to estimate the maximum RPM with permissible torque and thrust to ensure the safety of the mooring line and ship. In this paper, the propeller characteristics according to the draft variation for a moored ship is inveatigated. From these tests, it is shown that shaft submergence is a dominant parameter in the propeller performance at shallow shaft submergence and that the propeller performance is dependent upon the propeller RPM when the shaft submergence is kept unchanged. In this study, a simple formula of the required thrust for a given propeller shaft submergence and propeller RPM is derived. 1be propeller thrust, which is calculated by another formula in case of dtep draft, is compared with results of bollard pull test for FPSO.

  • PDF

중소형선의 저항추진성능추정 프로그램

  • 김은찬;고영철
    • Bulletin of the Society of Naval Architects of Korea
    • /
    • v.32 no.3
    • /
    • pp.12-18
    • /
    • 1995
  • 본 고에서는 중소형 선박의 초기설계시 필요로 하는 종합적인 저한추진성능 추정 프로그램을 다루고자 한다. 국내의 중소형 선박 설계자들이 많이 사용하고 있는 도표 및 회귀식을 선종별로 고루 모아서 손쉽게 사용할 수 있도록 전산화하였다. 이 프로그램에는 저항추진계수의 추정, 프로펠러의 간략한 설계 및 단독효율 추정, 전달동력과 회전수의 추정이 포함되어 있다.

  • PDF

Study on the Prediction Method of Ship′s Powering Performance Using the Data Bank (데이터뱅크를 이용한 선박 저항추진성능 추정 기법 연구)

  • Eun-Chan Kim;Kuk-Jin Kang
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.32 no.2
    • /
    • pp.68-74
    • /
    • 1995
  • The statistical analysis system is necessary to predict the resistance and powering performance quickly and precisely at the initial design stage. The authors propose the several functions of the performance prediction program and the structures of data bank. The program includes several series charts, regression coefficients and adapted regression analysis method based on the data bank to predict the resistance and propulsive coefficients. The calculation procedure to find out the principal dimensions and open-water efficiency of the optimum propeller is also included. The evaluation for the program and data bank is conducted by the arbitrarily selected 14 ship models. The results show good agreement with experiments within 5% mean prediction error.

  • PDF

Development of Internet-Based Marine Propeller Design and Analysis System (인터넷 기반 선박용 프로펠러 설계 및 해석 시스템 개발)

  • Jang, Hyun-Gil;Ahn, Byoung-Kwon;Moon, Il-Sung;Lee, Chang-Sup
    • Journal of Ocean Engineering and Technology
    • /
    • v.24 no.4
    • /
    • pp.66-71
    • /
    • 2010
  • Numerical prediction of propeller performance plays an important role in a marine propeller design process. Program developers are consistently trying to improve diminish predicted errors, and program users need to keep up with the latest ones with minimum expenditure of time and money. We have developed an internet based design system in which clients can design propellers with remote access. In this paper, optimized Internet based Propeller Design and Analysis System (iProDAS) for transferences of the massive data is presented, and a sample design using iProDAS is examined.

Cavitation and Noise Characteristics of High-Speed Propellers with Geometric Variations (고속 프로펠러의 형상변화에 따른 캐비테이션 및 소음 특성)

  • Jong-Woo Ahn;Young-Ha Park;Il-Sung Moon;Ki-Sup Kim
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.38 no.3
    • /
    • pp.23-30
    • /
    • 2001
  • The cavitation noise of high-speed propellers was experimentally studied using new measurement device in KRISO cavitation tunnel. A series of cavitation noise tests were carried out for 6 propellers with various sections, loading distributions, and a different area ratio. From the experimental results, the noise characteristics for various cavitation patterns and the noise performance for a series of propellers were analyzed. These can be used for full-scale prediction study of the noise and optimum design of high-speed propellers.

  • PDF

Development of a Preswirl Stator-Propeller System for Improvement of Propulsion Efficiency : a Symmetric Stator Propulsion System (추진 효율 향상을 위한 고정날개-프로펠러 추진시스템 개발: 대칭형 고정날개 추진 시스템)

  • Jin-Tae Lee;Moon-Chan Kim;Jung-Chun Suh;Soo-Hyung Kim;Jin-Keun Choi
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.29 no.4
    • /
    • pp.132-145
    • /
    • 1992
  • A series of design, theoretical analysis and model test procedures is presented for the development of an axisymmetric stator-propeller system. A preswirl stator is located in front of a propeller in order to improve the propulsion efficiency by cancellation of the slip stream rotational velocity due to the propeller. Model test results show that propulsion efficiency gain due to the symmetric stator-propeller system is about 3% compared to the single propeller. This efficiency gain would increase for full scale application since the pressure drag coefficient of the stator would decrease due to increasement of turbulent intensity behind the hull wake and increasement of Reynolds number.

  • PDF

Development of KD- Propeller Series using a New Blade Section (새로운 날개단면을 이용한 KD-프로펠러 씨리즈 개발)

  • J.T. Lee;M.C. Kim;J.W. Ahn;H.C. Kim
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.28 no.2
    • /
    • pp.52-68
    • /
    • 1991
  • A new propeller series is developed using the newly developed blade section(KH18 section) which behaves better cavitation characteristics and higher lift-drag ratio at wide range of angle-of-attack. The pitch and camber distributions are disigned in order to have the same radial and chordwise loading distribution with the selected circumferentially averaged wake input. Since the geometries of the series propeller, such as chord length, thickness, skew and rate distribations, are selected by regression of the recent full scale propeller geometric data, the performance prediction of a propeller at preliminary design stage can be mure realistic. Number of blades of the series propellers is 4 and the expanded blade area ratios are 0.3, 0.45, 0.6 and 0.75. Mean pitch ratios are selected as 0.5, 0.65, 0.8, 0.75 and 1.1 for each expanded area ratio. The new propeller series is composed of 20 propellers and is named as KD(KRISO-DAEWOO) propeller series. Propeller open water tests are performed at the experimental towing tank, and the cavitation observation tests and fluctuating pressure measurements are carried out at the cavitation tunnel of KRISO. $B_{P}-\delta$ curves, which can be used to select the optimum propeller diameter at the preliminary design stage, are derived from a regression analysis of the propeller often water test results. The KD-cavitation chart is derived from the cavitation observation test results by choosing the local maximum lift coefficient and the local cavitation number as parameters. The caviy extent of a propeller can be predicted more accurately by using the KD-cavitation chart at a preliminary design stage, since it is derived from the results of the cavitation observation tests in the selected ship's wake, whereas the existing cavitation charts, such as the Burrill's cavitation chart, are derived from the test results in uniform flow.

  • PDF

Proposal for Improvement in Prediction of Marine Propeller Performance Using Vortex Lattice Method (와류격자법에 의한 프로펠러 성능추정 향상을 위한 제안)

  • Suh, Sung-Bu
    • Journal of Ocean Engineering and Technology
    • /
    • v.25 no.4
    • /
    • pp.48-53
    • /
    • 2011
  • Current trends in propeller design have led to the need for extremely complex blade shapes, which place great demands on the accuracy of design and analysis methods. This paper presents a new proposal for improving the prediction of propeller performance with a vortex lattice method using the lifting surface theory. The paper presents a review of the theory and a description of the numerical methods employed. For 8 different propellers, the open water characteristics are calculated and compared with experimental data. The results are in good agreement in the region of a high advanced velocity, but there are differences in the other case. We have corrected the parameters for the trailing wake modeling in this paper, and repeated the calculation. The new calculation results are more in agreement with the experimental data.