• Title/Summary/Keyword: Radial Turbine

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Development of Radial Turbine for Air Cycle Refriger (공기 사이클 냉동기에 적응되는 반경 터빈의 개발)

  • Kwon, Gi-Hun;Lee, Ki-Ho;Kim, Jong-Seon
    • 유체기계공업학회:학술대회논문집
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    • pp.281-286
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    • 2001
  • The radial turbine has been successfully applied to the systems which request relatively small output compared with the axial turbine, and has low manufacturing cost due to it's small size and simple structure. Recently, the researches on the development and the efficiency maximization of the radial turbine are in progress corresponding with the trend toward miniaturization in turbo machinery and the development of small dispersed power generation systems. The radial turbine is to be applied to our turbo refrigerator of which engine speed is 26,000 rpm and turbine efficiency is $88\%$. Also, as a heat exchanger is accepted instead of a combustor in our turbo refrigerator, the design of radial turbine has been performed to be appropriate to the circumstance of low temperature air, not high temperature combustor gas, into the turbine inlet . This radial turbine is being developed in consideration with not only the aero-dynamic performance but also the simplification of manufacturing and integration, and the durability at operating condition. This paper refer to the performance evaluation about the radial turbine design by comparison with consulting from Russia and the our evaluation about various design factors which are considered in aero-dynamic design process.

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Study of the radial Turbine for Wave Energy Conversion (파력발전용 레이디얼터빈성능에 관한 연구)

  • Kim Tae-Ho;Kim Heuy-Dong;Setoguchi Toshiaki
    • Proceedings of the KSME Conference
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    • pp.549-552
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    • 2002
  • The objective of this study is to clarify the detailed performances of the impulse type radial turbine and to present an optimum configuration of the turbine. The impulse type radial turbine has been manufactured and investigated experimentally under steady and sinusoidally oscillating flow conditions by model testing. Then, the starting characteristics under sinusoidally flow conditions have been evaluated by a numerical simulation using a quasi-steady analysis. As a result, the running and starting characteristics of the impulse type radial turbine for wave energy conversion have been clarified. Furthermore, the recommended configuration is presented, especially for setting angles of inner and outer guide vanes.

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Numerical Analysis of Flow in Radial Turbine (Effects of Nozzle Vane Angle on Internal Flow)

  • OTSUKA, Kenta;KOMATSU, Tomoya;TSUJITA, Hoshio;YAMAGUCHI, Satoshi;YAMAGATA, Akihiro
    • International Journal of Fluid Machinery and Systems
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    • v.9 no.2
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    • pp.137-142
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    • 2016
  • Variable Geometry System (VGS) is widely applied to the nozzle vane for the radial inflow turbine constituting automotive turbochargers for the purpose of optimizing the power output at each operating condition. In order to improve the performance of radial turbines with VGS, it is necessary to clarify the influences of the setting angle of nozzle vane on the internal flow of radial turbine. However, the experimental measurements are considered to be difficult for the flow in radial turbines because of the small size and the high rotational speed. In the present study, the numerical calculations were carried out for the flow in the radial turbine at three operating conditions by applying the corresponding nozzle vane exit angles, which were set up in the experimental study, as the inlet boundary condition. The numerical results revealed the characteristic flow behaviors at each operating condition.

Performance Analysis by CFD and Aerodynamic Design of 100kW Class Radial Turbine Using Waste Heat from Ship (선박 폐열을 이용한 100kW급 구심터빈 공력설계 및 CFD에 의한 성능해석)

  • Mo, Jang-Oh;Kim, You-Taek;Kim, Mann-Eung;Oh, Cheol;Kim, Jeong-Hwan;Lee, Young-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.35 no.2
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    • pp.175-181
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    • 2011
  • The purpose of this study is to secure the design data for the optimization of the radial turbine and heat cycle system, by using the CFD analysis technique and the design of 100kW class radial turbine applicable to waste heat recovery generation system for ship. Radial turbine was comprised of scroll casing, vane nozzle with 18 blades and rotor with 13 blades, and analysis grid was used to about 2.3 million. Mass flow rate and rotational speed was 0.5kg/s, 75,0000rpm, respectively. Eight kinds of inlet pressure was set between 195 and 620kPa. As the flow accelerated through the nozzle passage to the throat, the pressure level at the pressure and suction sides becomed similar to about Mach number of 0.35. When the inlet temperature and pressure was $250^{\circ}C$, 352kPa respectively, the isentropic efficiency and mechanical power showed the analysis results of 74% and 108kW.

An Experimental Study on Flow in the Nozzle of a Radial Turbine (구심터빈의 노즐 내부 유동에 대한 시험 연구)

  • Kang, Jeong-Seek;Lim, Byeung-Jun;Ahn, Iee-Ki
    • The KSFM Journal of Fluid Machinery
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    • v.13 no.1
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    • pp.35-41
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    • 2010
  • Experimental study on the flow field inside the nozzle for radial turbine was performed. At design point, the pressure is high and the Mach number is low at the pressure side of the nozzle inlet semi-vaneless space as the flow turns through the nozzle vanes. As the flow accelerates through the nozzle passage to the throat the pressure level at the pressure and suction sides becomes similar. The flow continued accelerating from the throat to the inlet of turbine wheel and the pressure field became uniform in the circumferential direction in the vaneless space. In high expansion ratio condition, strong favorable pressure gradient band region occurred just after the throat in the semi-vaneless space in the circumferential direction and the pressure became uniform in the circumferential direction after this band. In low expansion ratio condition, core flow acceleration is dominant after the throat and this non-uniform pressure field reached to the inlet of turbine wheel.

A Study of Aerodynamic Design of a Radial Turbine for BOP of MCFC Fuel Cell System (연료전지 BOP용 구심터빈 공력설계에 관한 연구)

  • Choi, Bum-Seog;Ahn, Kook-Young;Park, Moo-Ryong
    • 유체기계공업학회:학술대회논문집
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    • pp.531-534
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    • 2006
  • This study is concerned with radial turbine design and performance improvement of a turbo generator system, which is used for maximizing performance of a 250kW MCFC fuel cell system. A preliminary design of a radial turbine has been performed under the thermodynamic and fluid-dynamic conditions determined by a cycle analysis of the MCFC BOP system. Basic demensions are determined by a meanline analysis and calculation of radial variation at the exit of the turbine. The turbine impeller is designed and modified by iterative processes of three dimensional flow analysis.

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An Investigation of Flow Characteristics of Radial Gas Turbine for Turbocharger under Unsteady Flow (과급기용 Radial Turbine의 비정상 유동특성에 관한 연구)

  • Choi, J.S.;Koh, D.K.;Winterbone, D.E.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.2 no.2
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    • pp.42-48
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    • 1994
  • Turbocharging is one of the best methods to improve the performance of diesel engines, because of its merits,-power ratio, fuel consumption and exhaust emissions. Most of them in small and medium diesel engines have adopted the pulse turbocharging method with twin entry vaneless radial turbines to maximize the energy utility of exhaust gas. This method requires the high performance of turbine under unsteady flow, and also the matching between turbine and diesel engine is most important. However, it is difficult to match properly between them. Because the steady flow data are usually used for it. Accordingly, it is necessary to catch the characteristics of turbine performance correctly over the wide range of the operation conditions under unsteady flow. In this paper, the characteristics of turbine performance under unsteady flow are represented at varying conditions, such as inlet pressure amplitude, turbine speed and frequence.

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CFD Performance Analysis and Design of a 8kW Class Radial Inflow Turbine for Ocean Thermal Energy Conversion Using a Working Fluid of Ammonia (암모니아 작동유체를 이용한 해수온도차발전용 8kW급 구심터빈의 설계 및 CFD 성능해석)

  • Mo, Jang-Oh;Cha, Sang-Won;Kim, You-Taek;Lim, Tae-Woo;Lee, Young-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.8
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    • pp.1030-1035
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    • 2012
  • In this research, we analysed design and CFD analysis of an inflow radial turbine for OTEC with an output power of 8kW using an working fluid of ammonia. The inflow radial turbine consists of scroll casing, vain nozzle with 18 blade numbers and rotor blade with 13 blade numbers. Mass flow rate, and inlet temperature are 0.5kg/s and $25^{\circ}C$ respectively, and variable rotational speeds were applied between 12,000 and 36,000 with 3,000 rpm intervals. As the results according to the rotational speeds, the designed speed is 24,000 rpm where maximum efficiency exists. The maximum efficiency and output power are 88.66% and 8.52kW, respectively. Through this study, we expect that the analysed results will be used as the design material for the composition of the turbine optimal design parameters corresponding to the target output power under various working material conditions.

Aerodynamic Rig Test of Radial Turbine for APU (APU용 구심터빈의 공력리그시험)

  • Kang, Jeong-Seek;Lim, Byeung-Jun;Ahn, Iee-Ki
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.37 no.1
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    • pp.1-7
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    • 2013
  • An aerodynamic rig test of a radial turbine for an auxiliary power unit (APU) was performed at a high-temperature turbine test facility at the Korea Aerospace Research Institute. The pressure ratio, Mach number, and flow coefficient in the rig test are the same as those under normal engine operation conditions. The design pressure ratio is 3.096, design test speed is 34909 rpm, and turbine inlet temperature is $160^{\circ}C$. The turbine has airfoil-type nozzles, and the diameter of the turbine wheel is 175.74 mm. The turbine map is experimentally measured, and the detailed flow at the turbine inlet is measured. The pressure distribution in the nozzle at both the hub and the shroud sides and the pressure distribution along the shroud casing of the turbine wheel were measured, and this confirmed that the expansion process in the turbine wheel is acceptable.