• Title, Summary, Keyword: Propulsion performance

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Study on the Performance of Waterjet Propulsion System for 180ton class Fishing Guard Ship (180톤 어업지도선 물분사 추진기의 성능시험 연구)

  • Jung, Un-Hwa;Kim, Moon-Chan;Chun, Ho-Hwan;Lee, Seung-Ho
    • Journal of the Society of Naval Architects of Korea
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    • v.46 no.2
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    • pp.127-135
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    • 2009
  • The performance of the waterjet system of 180 ton class fishing guard ship has been experimentally studied. A waterjet propulsion system has many advantages in comparison with a conventional screw propeller especially for high speed craft because of its good cavitation performance. Recently waterjet system has been applied to fishing boats and fishing guard ship because of avoiding a net problem although their speeds are not so high. This paper describes experimental procedure and analysis method of resistance and self-propulsion tests with a 1/14.46-scale model. Experimental results were analyzed according to ITTC 96 standard method. The full-scale effective power and delivered power of the ship were also analyzed and the full-scale speed predicted from the model test results shows a good agreement with the full-scale result from the sea trial tests.

Study on the Performance of Waterjet Propulsion System for Patrol Boat (해안경비정 물분사 추진기의 성능시험 연구)

  • Jung, Un-Hwa;Kim, Moon-Chan;Lee, Seung-Ho;Shin, Byung-Chul;Lee, Jin-Hee
    • Journal of the Society of Naval Architects of Korea
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    • v.47 no.2
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    • pp.178-187
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    • 2010
  • The performance of the waterjet system of a patrol boat has been experimentally studied. A waterjet propulsion system has many advantages comparing with a conventional screw propeller especially for high speed craft because of its good cavitation performance. This paper describes experimental procedure and analysis method of self-propulsion tests with a 1/12-scale model. Experimental results were analyzed according to ITTC 96 standard method. The full-scale effective power and delivered power of the ship were also analyzed and the full-scale speed predicted from the model test compares reasonably with the measured full-scale results of the sea trial.

Disk MHD Accelerator with Swirl Vane and Its Performance

  • Takeshita, Shinji;Furuya, Seizo;Harada, Nobuhiro
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.536-542
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    • 2008
  • The rocket technology has the best reliability and the high acceleration performance currently. In addition, next generation propulsion system is acquired to low cost and high payload percentage at that same time. This work is to improve the performance of Diskshaped MHD accelerator which is expected as the one of the solution. In this study we have been focusing on the swirl vane. It is so important to know that how the swirl vane contribute the plasma and its performance. As results, the gas velocities of r-component with inlet swirl were increased about over 3000m/s at the channel exit. And then static gas pressure were also reduced, we found that the case with inlet swirl gives the good influence to the acceleration performance. And the difference of the acceleration by positive and negative inlet swirl is that gas velocity of $\theta$-component may operate to the electric field.

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Performance Analysis of a Mixed-Flow Pump for Waterjet Propulsion

  • Ahn Jong-Woo;Kim Ki-Sup;Park Young-Ha;Kim Kyung-Youl;Oh Hyoung-Woo
    • Journal of Ship and Ocean Technology
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    • v.9 no.2
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    • pp.11-20
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    • 2005
  • A mixed-flow pump is largely applied for waterjet propulsion in high-speed vessels because of excellent cavitation performance. For the present study, we analyze the performance of mixed-flow pump, which is composed of impeller and stator. The test device for a mixed-flow pump was installed in the test section in the KRISO cavitation tunnel. The performance tests of two mixed-flow pumps were carried out with the test device at various flow rates using various nozzles. The test results agree fairly well with the predicted results by commercial CFD code. The test device is available for verification of impeller performance together with CFD analysis

Propellants helium saturated efforts and its effects for HTV(H-II transfer vehicle) propulsion system ground firing tests

  • Nakai, Shunichiro;Ishizaki, Shinichiro;Yamamoto, Mio;Okudera, Hiroyuki;Imada, Takane;Matsuo, Shinobu
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.399-402
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    • 2008
  • It is well known that helium saturated propellants significantly effects the dynamics of propulsion system, thruster cross coupling, water hammer and thruster performance. Especially for the propulsion systems, which have multiple high thrust engines, such as HTV(H-II transfer vehicle), the effect is more important. Therefore full-saturated propellants should be used at ground tests of HTV propulsion system and evaluate its effects. HTV is an advanced space vehicle being developed by Japan Aerospace Exploration Agency(JAXA) to enhance cargo delivery capabilities of the fleet of vehicles visiting the International Space Station(ISS). This paper presents an overview of the successful effort of the testing with saturated propellants(MMH/MON3) for HTV propulsion system during the ground firing tests.

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Performance Improvement Study of Propeller Propulsion Efficiency and Cavitation for the 8800TEU Class Container (8800TEU급 컨테이너선 프로펠러 추진효율 및 캐비테이션 성능향상 연구)

  • Ahn, Jong-Woo;Kim, Gun-Do;Kim, Ki-Sup;Park, Young-Ha;Ahn, Hae-Seong;Jung, Young-Jun;Yoon, Ji-Hyun
    • Journal of the Society of Naval Architects of Korea
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    • v.54 no.6
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    • pp.453-460
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    • 2017
  • In order to investigate propulsion efficiency and cavitation characteristics for expanded area ratio variation of the 8800TEU class container propeller, a series of performance tests were conducted at Large Cavitation Tunnel (LCT) and Towing Tank (TT) in KRISO. The cavitation test of the existing propellers (KP1029 & KP1030) was conducted using FRP model ship in LCT. On the basis of LCT test results, it was required to design propeller with better propulsion efficiency and cavitation performance. Two propellers (KP1171 & KP1172) with decreased expanded area ratio were designed on the basis of KP1029 propeller. The new design propellers showed higher efficiency than KP1029 and reasonable cavitation performance. In the future, they will be applied as the standard propeller for the propeller design of the large container ship. Through the performance test and prediction results for the new design propellers, it is thought that high-load propeller with better propulsion efficiency and cavitation performance will be developed constantly.

Study on Operating Performance Estimation Process of Electric Propulsion Systems for 2.5 Displacement Ton Class Catamaran Fishing Boat (쌍동형 배수량 2.5톤 급 어선의 전기 추진 시스템 운항성능 추정 프로세스 연구)

  • Jeong, Yong-Kuk;Lee, Dong-Kun;Jeong, Uh-Cheul;Ryu, Cheol-Ho;Oh, Dae-Kyun;Shin, Jong-Gye
    • Journal of Ocean Engineering and Technology
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    • v.27 no.5
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    • pp.1-9
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    • 2013
  • Because the environmental regulations for ships are getting tighter, green ships employing eco-friendly technology have recently received a large amount of attention. Among them, various studies for electric propulsion ships have been carried out, particularly in the United States, European Union, and Japan. On the other hand, research related to electric propulsion ships in Korea is in a very nascent stage. In this paper, an estimation process based on the rough requirements of ship-owners for the operating performance of electric propulsion ships is proposed. In addition, the estimation process is applied to a small fishing boat for verification of the process. These results are expected to be used as design guidelines in the early stage of the design process for electric propulsion ships.

Propulsion Technologies of Supercavitating Rocket Torpedo, Shkval (초공동 로켓 어뢰 Shkval 추진기술)

  • Kim, Yoon-Gon;Nah, Young-In
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.383-387
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    • 2011
  • The supercavitating rocket torpedo SHKVAL was analyzed in view of its system operation procedure and the structure and performance. 3 different propulsion systems installed in SHKVAL were 1st solid rocket booster for launch and acceleration, 2nd solid rocket booster for further acceleration, and Mg-rich Hydroreactive fuel rocket propulsion system for cruising. The gas generator used to help generate the supercavitation bubble was composed of a solid propellant gas generator and a hydroreactive fuel one. The structures and their performance were described based on as much knowledge as we have obtained from cumulative information and up-to-date analysis.

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Development of Block type Inlet Distortion Simulating Device for Gas Turbine Engine Inlet Distortion Test

  • Lee, Kyung-Jae;Lee, Bo-Hwa;Kang, Sang-Hun;Jung, Jae-Hong;Yang, Soo-Seok;Lee, Dae-Sung;Kwak, Jae-Su
    • International Journal of Aeronautical and Space Sciences
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    • v.8 no.2
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    • pp.121-125
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    • 2007
  • In late 1960's, engineers of the engine manufacturer experienced that the distortion of inlet flow of turbofan and turbojet engine could cause the surge in compressor and affect overall engine operational performance, which result in the deterioration of stability of the engine. In this study, block type of inlet distortion simulating device has been developed in order to investigate the effect of inlet distortion on the deterioration of overall engine operational performance. The inlet distortion simulating device was installed in front of engine inlet in order to simulate distortion of inlet flow. The degree of inlet distortion was measured by rakes installed upstream the inlet distortion simulating device and between the engine inlet and inlet distortion simulating device. Before applying the inlet distortion simulating device to real engine, preliminary tests were performed with a simulated engine in order to verify the degree of inlet distortion by the device. Preliminary inlet distortion tests were performed in Altitude Engine Test Facility(AETF) of Korea Aerospace Research Institute(KARI) and results showed that the inlet distortion simulating device could be used in simulating various inlet distortion cases.