Study on effect of air intake method to prevent cavitation in various guide vane opening ratio of cross-flow turbine.

2021 ◽  
Vol 2021.27 (0) ◽  
pp. 11E05
Author(s):  
Kouki OHIRA ◽  
Yuuki NISHIKAWA ◽  
Xiangtong MENG ◽  
Takaya KITAHORA ◽  
Sho KAMODA ◽  
...  
Keyword(s):  
Guide Vane ◽  
Cross Flow ◽  
Air Intake ◽  
Opening Ratio

scholarly journals Development of a Hydropower Turbine Using Seawater from a Fish Farm

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 266
Author(s):  
Md Rakibuzzaman ◽  
Sang-Ho Suh ◽  
Hyoung-Ho Kim ◽  
Youngtae Ryu ◽  
Kyung Yup Kim
Keyword(s):  
Power Plants ◽  
Guide Vane ◽  
Cross Flow ◽  
Synchronous Generator ◽  
Fish Farm ◽  
Hydropower Plant ◽  
Fish Farms ◽  
Data Simulation ◽  
Small Hydropower ◽  
Hydropower Plants

Discharge water from fish farms is a clean, renewable, and abundant energy source that has been used to obtain renewable energy via small hydropower plants. Small hydropower plants may be installed at offshore fish farms where suitable water is obtained throughout the year. It is necessary to meet the challenges of developing small hydropower systems, including sustainability and turbine efficiency. The main objective of this study was to investigate the possibility of constructing a small hydropower plant and develop 100 kW class propeller-type turbines in a fish farm with a permanent magnet synchronous generator (PMSG). The turbine was optimized using a computer simulation, and an experiment was conducted to obtain performance data. Simulation results were then validated with experimental results. Results revealed that streamlining the designed shape of the guide vane reduced the flow separation and improved the efficiency of the turbine. Optimizing the shape of the runner vane decreased the flow rate, reducing the water power and increasing the efficiency by about 5.57%. Also, results revealed that tubular or cross-flow turbines could be suitable for use in fish farm power plants, and the generator used should be waterproofed to avoid exposure to seawater.

scholarly journals Guide Vane with Current Plate to Improve Efficiency of Cross Flow Turbine

2013 ◽  
Vol 03 (02) ◽  
pp. 28-35 ◽  
Author(s):  
Kiyoshi Kokubu ◽  
Toshiaki Kanemoto ◽  
Keisuke Yamasaki
Keyword(s):  
Guide Vane ◽  
Cross Flow ◽  
Improve Efficiency

Performance Improvement of Cross-Flow Turbine with a Cylindrical Cavity and Guide Wall

2021 ◽  
Author(s):  
Naoto Ogawa ◽  
Mirei Goto ◽  
Shouichiro Iio ◽  
Takaya Kitahora ◽  
Young-Do Choi ◽  
...  
Keyword(s):  
Performance Improvement ◽  
Performance Test ◽  
Guide Vane ◽  
Cross Flow ◽  
Maximum Efficiency ◽  
Small Hydropower ◽  
Turbine Efficiency ◽  
Partial Load ◽  
Guide Wall ◽  
The Cross

Abstract The cross-flow turbine has been utilizing the development of small hydropower less than about 500kW in the world. The turbine cost is lower than the other turbines because of its smaller assembled parts and more straightforward structures. However, the maximum efficiency of the cross-flow turbine is lower than that of traditional turbines. Improving the turbine efficiency without increasing manufacturing costs is the best way to develop small hydropower in the future. This study is aiming to improve the turbine efficiency at the design point and partial load. The runner's outflow angle varies with turbine speed and guide vane opening in the typical cross-flow turbine. The tangential velocity component remains in the outflow in these conditions; thus, change the outflow direction along the runner's radial direction is helpful for performance improvement. The authors experimentally change the desirable outflow angle by attaching a cavity and a guide wall at the outside casing tip. The turbine performance test was conducted for various turbine speeds and guide vane opening. Next, flow visualization around the runner was performed. As a result, the effect of the cavity and the guide wall can be revealed. The outlet flow fields are different by attaching the cavity and the guide wall, especially between the partial and optimum load conditions.

Aerodynamic Influence of Endwall Fences Located in the Vicinity of the Leading Edge-Endwall Junction of Nozzle Guide Vanes

2011 ◽  
Author(s):  
Zeki Ozgur Gokce ◽  
Cengiz Camci
Keyword(s):  
Total Pressure ◽  
Numerical Study ◽  
Guide Vane ◽  
Flow Characteristics ◽  
Cross Flow ◽  
Vertical Cylinder ◽  
Leading Edge ◽  
Horseshoe Vortex ◽  
Horseshoe Vortices ◽  
Nozzle Guide

Secondary flow characteristics like horseshoe vortices and related total pressure losses decrease turbine efficiency. Computerized simulations of potentially favorable modifications in turbine systems could provide a fast, numerical and inexpensive method of evaluating their effects on flow properties: This paper consists of a comparative numerical study of the flow characteristics of a domain containing a vertical cylinder subjected to cross flow and upstream endwall modifications. Analyzing the flow around a turbine nozzle guide vane (NGV) could be simplified by modeling it as a vertical cylinder with a diameter proportional to the leading edge diameter of the blade, and adding upstream endwall fences of varying dimensions and alignments could attenuate the development of a horseshoe vortex. A commercial computational fluid dynamics (CFD) software package, Fluent, was used for the numerical analysis. To validate the modeling strategy, experimental data previously reported in the literature for conventional cylinders in cross flow were compared to the current predictions. A grid independence study was also performed. The lateral distance between the two legs of the horseshoe vortex downstream of the cylinder was decreased by 7% to 14%. All fence types effectively changed the location of the main horseshoe vortex roll-up. The height of the fence was more influential than the length of the fence in modifying flow characteristics. The existence of the fences slightly increased the mass-averaged total pressure loss far downstream of the cylinder; however, beneficial near-fence flow characteristics were observed in all cases. Also, it was noted that an endwall fence could possibly result in decreased interaction between the horseshoe vortices created by consecutive blades in a row of NGV blades, which would be expected to result in improved flow conditions within actual turbine passages.

Numerical Analysis on Effects of the Contoured Endwall on the Three Dimensional Flow Characteristics in an Annular Turbine Nozzle Vane

2007 ◽  
Author(s):  
Wu Sang Lee ◽  
Jin Taek Chung ◽  
Dae Hyun Kim ◽  
Seung Joo Choe
Keyword(s):  
Guide Vane ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Cross Flow ◽  
Leading Edge ◽  
Secondary Flows ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Nozzle Guide Vane ◽  
Nozzle Guide

The three-dimensional flow in a turbine nozzle guide vane passage causes large secondary loss through the passage and increased heat transfer on the blade surface. In order to reduce or control these secondary flows, a linear turbine with contoured endwall configurations was used and changes in the three-dimensional flow field were analyzed and discussed. Contoured endwalls are installed at a location downstream of the saddle point near the leading edge of the pressure side blade and several positions along the centerline of the passage at constant distance. The objective of this study is to document the development of the three-dimensional flow in a turbine nozzle guide vane cascade with modified endwall. In addition, it proposes and appropriates endwall contouring which shows best overall loss reduction performance among the simulated contoured endwall. The results of this study show that the development of passage vortex and cross flow in the cascade composed of one flat and one contoured endwalls are affected by the acceleration which occurs in contoured endwall side. The overall loss is reduced near the flat endwall rather than contoured endwall, the best performance was shown for the case of 10–15% contoured for span-wise, 40–70% length of chord from trailing edge.

scholarly journals PENGARUH BUKAAN GUIDE VANE TERHADAP KINERJA TURBIN PIKOHIDRO TIPE CROSS-FLOW

2017 ◽  
Vol 6 (1) ◽  
Author(s):  
Mafruddin Mafruddin ◽  
Marsuki Marsuki
Keyword(s):  
Guide Vane ◽  
Cross Flow

Turbin Cross-flow merupakan salah satu jenis turbin implus yang paling umum digunakandalam pembangkit listrik tenaga air salah satunya pembangkit listrik tenaga pikohidro. Lokasiyang dapat diaplikasikan turbin Cross-flow sebagai pembangkit listrik tenaga pikohidro yaitudi desa Sumber Agung Kecamatan Suoh Kabupaten Lampung Barat. Salah satu faktor yangmempengaruhi kinerja turbin Cross-flow yaitu bukaan guide vane. Penelitian ini bertujuanuntuk mengetahui pengaruh bukaan guide vane terhadap kinerja turbin Cross-flow. Metodeyang digunakan dalam penelitian ini melalui 6 (enam) tahapan yaitu studi pustaka, observasi,desain turbin, pembuatan tuirbin, pengujian turbin dan analisis hasil pengujian. Variasi bukaanguide vane yaitu bukaan 20%, 40%, 60% dan 80%. Dari hasil penelitian diketahui bahwabukaan guide vane berpengarh terhadap kinerja turbin Cross-flow. Efisiensi tertinggi turbinCross-flow diperoleh dengan bukaan guide vane 80% yaitu sebesar 40%, sedangkan untukbukaan 60% efisiensi turbin sebesar 39%, untuk bukaan 40% efisiensi turbin sebesar 37% danbukaan 20 efisaiensi turbin sebesar 35%.Kata Kunci: Guide Vane , Kinerja, Turbin Cross-flow

1813 Study on the Performance of a Cross-flow Wind Turbine with Guide Vane

2005 ◽  
Vol 2005 (0) ◽  
pp. 270
Author(s):  
Ken-ichi KANEKO ◽  
Satoshi KAGAWA ◽  
Yoshiharu TSUJIKAWA
Keyword(s):  
Wind Turbine ◽  
Guide Vane ◽  
Cross Flow
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