• Title/Summary/Keyword: impulse turbine

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A Twin Impulse Turbine for Wave Energy Conversion -The Performance under Unsteady Airflow-

  • Alam, M M Ashraful;Sato, Hideki;Takao, Manabu;Okuhara, Shinya;Setoguchi, Toshiaki
    • International Journal of Fluid Machinery and Systems
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    • v.9 no.4
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    • pp.300-306
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    • 2016
  • A twin unidirectional impulse turbine for wave energy conversion has been suggested in our previous study, and the performance under unsteady flow has been investigated by quasi-steady analysis. In the present study, the performance of twin impulse turbine under unsteady flow condition has been investigated by unsteady analysis of Computational fluid dynamics. As a result, the mean efficiency of twin unidirectional impulse turbine under unsteady flow is lower than the maximum efficiency of unidirectional impulse turbine. Moreover, it is verified that airflow goes backward in the reverse turbine in low flow rates.

Turbine Performance Experiments for the Turbopump of a Liquid Rocket Engine

  • Lee, Hanggi;Shin, Juhyun;Jeong, Eunhwan;Choi, Changho
    • International Journal of Aerospace System Engineering
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    • v.3 no.1
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    • pp.25-29
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    • 2016
  • This paper highlights the performance of an impulse turbine which is a part of turbopump in a liquid rocket first stage engine. The turbopump, currently under development at Korea Aerospace Research Institute, has an impulse type turbine with 12 nozzles and a single rotor. The impulse turbine can archive high specific power with the low gas flow rates. The supersonic impulse turbine with a single rotor can make a simple structure. High-pressure gases are converted into the dynamic energy with flows through the 12 nozzles and drive the rotor to make the power for the pumps. The turbine test was performed in the high-pressured turbine test facility with air gas instead of burned gas. A hydraulic dynamometer was used to absorb the power from the turbine and control the rotational speed and torque. The test points were at several pressure ratios with 7 different rotational speeds. Results showed the efficiency was highest at the design pressure ratio. The efficiency was insensitive to the pressure ratio variation than the rotational speed. It was a typical characteristic in an impulse turbine.

Present State of Self-Rectifying Air Turbines for Wave Energy Conversion

  • Setoguchi, Toshiaki;Takao, Manabu
    • 유체기계공업학회:학술대회논문집
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    • 2003.12a
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    • pp.3-12
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    • 2003
  • This paper reviews the present state of the art on the self-rectifying air turbines, which could be used for wave energy conversion. The overall performances of the turbines under irregular wave conditions, which typically occur in the sea, have been evaluated numerically and compared from the viewpoints of the starting and running characteristics. The types of turbine included in the paper are as follows: (a) Wells turbine with guide vanes (WTGV); (b) turbine with self-pitch-controlled blades (TSCB); (c) biplane Wells turbine with guide vanes (BWGV); (d) impulse turbine with self-pitch-controlled guide vanes (ISGV) and (e) impulse turbine with fixed guide vanes (IFGV). As a result, under irregular wave conditions it is found that the running and starting characteristics of the impulse type turbines could be superior to those of the Wells turbine. Moreover, the authors have explained the mechanism of hysteretic behavior of the Wells turbine and the necessity of links for improvement of the performance of ISGV.

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A Study on the Development of a New Micro Positive Displacement Hydraulic Turbine (마이크로 용적형 수차의 개발에 관한 연구)

  • Lee, Young-Ho;Choi, Young-Do
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.2
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    • pp.284-290
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    • 2006
  • For the case of high head and critical low flow rate range of micro hydropower resources, it requires very low specific speed turbines which are lower than conventional impulse turbine's specific speed. In order to satisfy the request for very low specific speed turbine with high efficiency, a new positive displacement turbine is developed. The performance characteristics of the new turbine is tested and compared with a conventional impulse turbine, which is used for automatic water faucet system. The purpose of present study is to develop an high performance turbine that can be used to extract micro hydropower potential of a water supply system. The test results show that the positive displacement turbine is much more efficient than the conventional turbine and it can sustain high efficiency under the wide range of operating conditions. The pressure pulsations at the inlet and outlet of the positive displacement turbine can be considerably minimized by using simple pressure damper.

A Study of Self Starting Characteristics of Impulse Turbine of Wave Energy Conversion (파력발전용 임펄스 터어빈의 자기 기동 특성 해석)

  • MOON JAE-SEUNG;HYUN BEOM-SOO
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2004.11a
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    • pp.220-224
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    • 2004
  • The present paper deals with the numerical study to analyze the self-starting performance of impulse turbine in a reciprocating air flow generated by sinusoidal motion of wave inside oscillating water column. Result was compared to that of Wells turbine, well-known wave energy conversion device, and showed that the impulse turbine has a superior self-starting ability. More detailed parametric study was performed to demonstrate the effects of moment of inertia of rotor, loading torque, tip clearance and angle of guide vane.

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A 3-Dimensional Numerical Simulation of Impulse Turbine for Wave Energy Conversion

  • Lee, Hyeong-Gu;Lee, Yeon-Won
    • Journal of Advanced Marine Engineering and Technology
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    • v.27 no.4
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    • pp.535-541
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    • 2003
  • This paper describes numerical analysis of the impulse turbine with fixed guide vanes, a high performance hi-directional air turbine having simple structure for wane energy conversion. A 3-dimensional incompressible viscous flow numerical analysis based on the full Reynolds-averaged Wavier-Stokes equations was made to investigate the internal flow behavior Numerical results ate compared with experimental data. As a result, a suitable choice for the one of design factors has been clarified.

The Effect of Rotor Tip Geometry on the Performance of Turbopump Turbine (터보펌프 터빈의 로터 팁 형상에 따른 성능변화 연구)

  • Jeong, Eun-Hwan;Park, Pyun-Goo;Kim, Jin-Han
    • Aerospace Engineering and Technology
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    • v.6 no.2
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    • pp.197-204
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    • 2007
  • Effect of rotor tip geometry on the performance of supersonic impulse turbine was investigated experimentally. Using the shrouded supersonic impulse turbine of the 30ton class liquid rocket engine turbopump as a base model, the measured performance of de-shrouded rotor was compared. The effect of nozzle-rotor overlap also has been investigated. It has been found that the magnitude of turbine efficiency is largely affected by the existence of the rotor shroud. However, measured efficiency sensitivity of the de-shrouded supersonic impulse turbine with respect to turbine tip clearance was relatively smaller than that of high performance reaction turbine. It also has been found that there exists nozzle-rotor overlap value which results optimum efficiency in supersonic impulse turbine.

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Experimental Investigation of the Effect of Partial Admission Ratio on the Performance of Supersonic Impulse Turbine (초음속 충동형 축류터빈의 부분분사비 효과에 대한 실험적 연구)

  • Jeong, Eun-Hwan;Park, Pyun-Goo;Kim, Jin-Han
    • Journal of the Korean Society of Propulsion Engineers
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    • v.11 no.4
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    • pp.59-66
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    • 2007
  • In this paper, experimental investigation results of the effect of partial admission ratio on the performance of axial turbine was presented. A supersonic impulse turbine of gas generator cycle liquid rocket engine turbopump was used for the test. for experimental purpose, a nozzle block, in which total 14 number of axi-symmetric convergent-divergent nozzles are arranged circumferentially, was designed and manufactured. Partial admission ratio was controlled by changing the number of active nozzles. High pressure air was used as working medium for the test. The experimental result revealed that the performance of the supersonic impulse turbine does not much affected by the partial admission ratio for supersonic impulse turbine.

Experiments on Supersonic Impulse Turbine (초음속 충동형 터빈에 대한 시험적 고찰)

  • Jeong, Eun-Hwan;Kim, Jin-Han
    • The KSFM Journal of Fluid Machinery
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    • v.8 no.6 s.33
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    • pp.26-32
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    • 2005
  • 1.6 MW class supersonic partial admission impulse turbine has been designed and tested in Korea Aerospace Research Institute for the liquid rocket engine application. The test has been performed using a high pressure air source facility in KARI. For the turbine power absorption, a hydraulic dynamometer has been used. Appropriate similarity relations are used for the determination of test condition. Various settings of turbine pressure ratio and rotational speed are tested to investigate global turbine characteristics. From measured data, parameters related to the turbine design are derived and validated.

Experiments on Supersonic Impulse Turbine (초음속 충동형 터빈에 대한 시험적 연구)

  • Jeong, Eunhwan;Lee, Eun Seok;Kim, Jinhan
    • 유체기계공업학회:학술대회논문집
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    • 2004.12a
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    • pp.125-131
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    • 2004
  • 1.6 MW class supersonic partial admission impulse turbine has been designed and tested in Korea Aerospace Research Institute for the liquid rocket engine application. The test has been performed using a high pressure air source facility in KARI. For the turbine power absorption, a hydraulic dynamometer is used. Appropriate similarity relations are used for the determination of test condition. Various settings of turbine pressure ratio and rotational speed are tested to investigate global turbine characteristics. From measured data, Parameters related to the turbine design are derived and validated.

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