• Title/Summary/Keyword: Guide Vane

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Numerical Simulation of Duct Flow about Shape and Arrangement of Inlet Guide Vane to Increase the Temperature Uniformity (전치 가이드 베인 배치 및 형상에 따른 보일러 입구 온도분포의 수치해석 연구)

  • Lee, Su-Yun;Shin, Seung-Won
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.1172-1177
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    • 2008
  • Diverging channel from gas burner exit to the inlet section of Heat Recovery Steam Generator (HRSG) has been re-designed for 1 MW steam supply and power generation system. Three different test geometries have been chosen for the numerical simulation. The existing design for 300 kW HRSG system (CASE B) has been improved by geometry and position changes of inlet guide vanes along with gas velocity entrance angle at the diverging channel inlet (CASE C). Both cases has been compared with the case where hot combustion gas is directly injected without any guide vanes (CASE A). Improved design shows overall uniform velocity and temperature distribution compared to existing design.

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Surge Control of Turbofan Engine Compressor with the Variable Inlet Guide Vane (가변 안내익을 이용한 터보팬 엔진 압축기의 서지 제어)

  • Bae, Kyoungwook;Kim, Sangjo;Han, Dongin;Min, Chanoh;Lee, Daewoo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.7
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    • pp.539-546
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    • 2013
  • Surge phenomenon can be occurred in a compressor when compressor performance of turbofan engine for an aircraft is changed considerably in a short time on the cases like take-off phase and changing of RPM from idle to maximum, because performance of aircraft engine is changed suddenly. This study is aimed to avoid surge in a compressor. Dynamic simulation in a compressor is modeled by simulink in specific condition. Fuel flow is control input, rpm and air mass flow are expressed in terms of transfer function. Surge margin is obtained by using compressor performance map from NPSS. VIGV(Variable Inlet Guide Vane) is controlled by PD controller with difference between surge margin and reference. Finally this paper verifies IGV can prevent surge phenomenon in a compressor.

An Experimental Study on the Thermal Performance of Air Filled Thermal Diode (공기를 작동 유체로 하는 열다이오드의 열성능에 관한 실험적 연구)

  • Pak, Ee-Tong;Jang, Young-Geun;Hwang, In-Ju
    • Solar Energy
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    • v.17 no.2
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    • pp.35-42
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    • 1997
  • Thermal diode is a device which allows heat to be transferred in one direction by convection due to difference of density of fluid, and blocks heat flow in the opposite direction. Vertical plate for heat collection and radiation are of utility for design of thermal diode. It was considered the transient and steady state of air filled thermal diode with guide vane which combined rectangular and parallelogrammic shape enclosures. $Gr^*$ was kept constantly on $1.11{\times}10^{10}{\sim}1.4{\times}10^{10}$ and error range was ${\pm}3%$ during the experiment. Nu was examined when inclined angle are $15^{\cir\c}\;and\;45^{\circ}$ and, also the experiments was carried out with and without guide vane as well. Specially, Nu was linearly increased due to increase of $Gr^*$, and the effect of guide vane and dimensionless channel depth was sensitive. Developed state of temperature began at dimensionless time $0.5{\sim}0.6$ due to variation of inclined angle, which is characteristic of system.

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Study of the Supersonic Ejector-Diffuser System with a Mixing Guide Vane (혼합 안내깃을 적용한 초음속 이젝터-디퓨져 시스템에 대한 연구)

  • Kong, Fanshi;Jin, Yingzi;Kim, Heuydong
    • Journal of the Korean Society of Propulsion Engineers
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    • v.17 no.1
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    • pp.52-60
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    • 2013
  • Ejector-diffuser system makes use of high-pressure primary stream to entrain the low-pressure secondary stream through pure shear action between two streams. In general, the flow field in the ejector-diffuser system is highly complicated due to turbulent mixing, compressibility effects. A fatal drawback of the ejector system is in its low efficiency. Many works have been done to improve the performance of the ejector system, but not yet satisfactory. In the present study, a mixing guide vane was installed at the inlet of the secondary stream for the purpose of the performance improvement of the ejector system. A CFD method has been applied to simulate the supersonic flows inside the ejector-diffuser system. The present results obtained were validated with existing experimental data. The mixing guide vane effects are discussed in terms of the entrainment ratio, total pressure loss as well as pressure recovery.

A Study on the Performance Prediction Method for an Axial Compressor with Variable Inlet Guide Vane (가변 입구 안내익이 있는 축류압축기의 성능예측 방법에 관한 연구)

  • Kim, Dong-Hyun;Kim, Sang-Jo;Kim, Kui-Soon;Son, Chang-Min;Kim, You-Il;Min, Seong-Ki
    • Journal of the Korean Society of Propulsion Engineers
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    • v.16 no.4
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    • pp.1-8
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    • 2012
  • In this study, numerical method, stage stacking method based on the result of numerical method and scaled stage stacking method have been applied to predict the performance of a multi-stage axial compressor with inlet guide vane. The results obtained through three different methods for off-design conditions were compared with performance test data. And the effect the angle of variable inlet guide vane was also investigated. The three-dimensional numerical simulation has been performed by using flow analysis program, $FLUENT^{TM}$ 6.3 and the performance prediction based on the stage stacking method has been performed with compressor analysis code from NASA.

The performance of combined heat and power plant according to gas turbine air mass flow rate change (가스터빈 공기량 조절에 따른 열병합발전 성능 변화)

  • Kim, Jae-Hoon;Moon, Seung-Jae
    • Plant Journal
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    • v.18 no.2
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    • pp.32-40
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    • 2022
  • In this study, we investigated the operation data of combined heat and power in accordance with the change of the inlet guide vane with partial load. The partial load 80% could close the inlet guide vane up to 24%, and the exhaust gas temperature could be increased by 52℃. The partial load 90% could close the inlet guide vane up to 12%, and the exhaust gas temperature could be increased by 23℃. At 80% of partial load with the thermal load tracking mode, the output could be increased up to 5.68 MW, the combined cycle efficiency increased by 0.73%, and the combined heat and power efficiency increased by 1.81%. At 90% of the partial load, the output could be increased up to 2.55 MW, the combined cycle efficiency increased by 0.32%, and the combined heat and power efficiency increased by 0.72%.

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Experimental Study on Effect of the Contoured Endwall on the Three-Dimensional Flow in a Turbine Nozzle Guide Vane Cascade (끝벽의 형상이 터빈 노즐안내깃 캐스케이드내 3차원 유동에 미치는 영향에 관한 연구)

  • Yun, Won-Nam;Chung, Jin-Taek
    • 유체기계공업학회:학술대회논문집
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    • 2003.12a
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    • pp.514-519
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    • 2003
  • The objective of this study is to document the secondary flow and the total pressure loss distribution in the contoured endwall installed linear turbine nozzle guide vane cascade passage and to propose an appropriate contraction ratio of the contoured endwall which shows the best loss reduction among the simulated cases. In this study, three different contraction ratio of contoured endwalls have been tested. This study was performed by experimental method and when the contoured endwall has the contraction ratio of 0.17 on exit height the results showed the best loss reduction.

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Performance Characteristics of Small Tubular-type Hydroturbine according to the Guide Vane Opening Angle by Experiment and CFD (실험 및 CFD에 의한 가이드베인 개도에 따른 소형 튜블러 수차의 성능특성)

  • Nam, Sang-Hyun;Kim, You-Taek;Choi, Young-Do;Lee, Young-Ho
    • The KSFM Journal of Fluid Machinery
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    • v.11 no.5
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    • pp.44-49
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    • 2008
  • As the alternative energy, renewable energy should have been developing by many techniques, in order to substitute the fossil fuel which will be disappeared in the near future. One of the small hydropower generator, main concept of tubular turbine is based on using the different water pressure levels in pipe lines, energy which was initially wasted by using a reducing valve at the end of the pipeline, is collected by turbine in the hydro power generator. A propeller shaped hydro turbine has been used in order to use this renewable pressure energy in order to acquire basic design data of tubular type hydraulic turbine, output power, head, efficiency characteristics due to the guide vane opening angle are examined in detail. First, it ensures the reliance of CFD by that of compared with experiment data. After all, the results of performance characteristics of the CFD and experiment show to confirm the data that power, head and efficiency of less than 4%, 2% and 5% respectively. Moreover influences of pressure, tangential and axial velocity distributions on turbine performance are investigated.

An Experimental Study on the Performance of a Surface Piercing Propeller in Tunnel (수면관통형 터널 프로펠러의 성능해석을 위한 실험적 연구)

  • Jeong, Seong-Wook;Lee, Seung-Hee
    • Journal of the Society of Naval Architects of Korea
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    • v.43 no.3 s.147
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    • pp.294-303
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    • 2006
  • A surface piercing propeller (SPP) in tunnel has been proposed recently as a new propulsion system for a high speed air cavity ship. The purpose of the present study is to investigate the characteristics of the SPP in tunnel through a series of model tests. A model propulsion system is placed on a dummy body made of Acrylics. The tunnel is divided into two regions by a guide vane extending from the inlet to the center of the propeller shaft. Air has been supplied from an air nozzle placed at the bottom of the dummy body and the changes in propeller performances caused by the air flow are investigated. The measurements are done for open water and in-tunnel conditions, both for fully and partially submerged propeller. The influence of the guide vane configurations on the propeller performance is also studied. The experiments are performed at the variable pressure circulation water channel of Inha University

Reduced Scale Model Experiments and Numerical Simulation for Flow Uniformity in de-NOx SCR Reactor (배연탈질 SCR 반응기내 유동균일 화를 위한 축소모형실험 및 전산해석)

  • 이인영;김동화;이정빈;류경옥
    • Journal of Korean Society for Atmospheric Environment
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    • v.17 no.4
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    • pp.347-354
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    • 2001
  • SCR (Selective Catalytic Reduction) process is presently considered as one of the most effective techniques for removing nitric oxides from exhaust gases. In this study, based on the conceptually designed SCR reactor of 500 MW coal fired power plant. a reduced scale (1/20) SCR reactor model was made to analyze the flow pattern in front of catalyst layer according to the guide vane's design factors such as the number, interval, and angle of vanes. The results of the test were compared to those numerical simulation in order to assure the reliability of two methods. On the basis of our study. the critical Reynolds number (2.0$\times$ 10$^{5}$ ) was proposed for ensuring the similarity between the reduced scale model and the prototype of SCR reactor. Optimum design parameters of guide vanes were determined as follows, 4 vanes, the first vane angle of 93$^{\circ}$, and the vane intervals of 0.85 S/n, 1.05 S/n, 1.1 S/n, 1.0S/n, 1.0S/n (S: the distance of duct, n: the number of guide vanes). The excellent agreement between the results of the numerical simulation and the reduced scale model provides the validation of two methods for prediction of flow through SCR reactor.

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