scholarly journals Study on an Axial Flow Hydraulic Turbine with Collection Device

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Yasuyuki Nishi ◽  
Terumi Inagaki ◽  
Kaoru Okubo ◽  
Norio Kikuchi
Keyword(s):  
Velocity Ratio ◽  
Axial Flow ◽  
Hydraulic Turbine ◽  
Power Coefficient ◽  
Speed Ratio ◽  
Maximum Output ◽  
Recovery Coefficient ◽  
Composite Body ◽  
Inlet Velocity ◽  
Collection Device

We propose a new type of portable hydraulic turbine that uses the kinetic energy of flow in open channels. The turbine comprises a runner with an appended collection device that includes a diffuser section in an attempt to improve the output by catching and accelerating the flow. With such turbines, the performance of the collection device, and a composite body comprising the runner and collection device were studied using numerical analysis. Among four stand-alone collection devices, the inlet velocity ratio was most improved by the collection device featuring an inlet nozzle and brim. The inlet velocity ratio of the composite body was significantly lower than that of the stand-alone collection device, owing to the resistance of the runner itself, the decreased diffuser pressure recovery coefficient, and the increased backpressure coefficient. However, at the maximum output tip speed ratio, the inlet velocity ratio and the loading coefficient were approximately 31% and 22% higher, respectively, for the composite body than for the isolated runner. In particular, the input power coefficient significantly increased (by approximately 2.76 times) owing to the increase in the inlet velocity ratio. Verification tests were also conducted in a real canal to establish the actual effectiveness of the turbine.

313 Effect of Number of Blades on Performance of an Axial Flow Hydraulic Turbine with a Collection Device

2013 ◽  
Vol 2013.21 (0) ◽  
pp. 127-128
Author(s):  
Kaoru Okubo ◽  
Yasuyuki Nishi ◽  
Sou Hirama ◽  
Terumi Inagaki ◽  
Yukio Kikuchi
Keyword(s):  
Axial Flow ◽  
Hydraulic Turbine ◽  
Collection Device

S051011 Development of Axial Flow Hydraulic Turbine with Collection Device

2012 ◽  
Vol 2012 (0) ◽  
pp. _S051011-1-_S051011-5
Author(s):  
Hironobu IWAMOTO ◽  
Yasuyuki Nishi ◽  
Terumi INAGAKI ◽  
Kaoru OKUBO ◽  
Norio KIKUCHI
Keyword(s):  
Axial Flow ◽  
Hydraulic Turbine ◽  
Collection Device

Performance characteristics of axial flow hydraulic turbine with a collection device in free surface flow field

2017 ◽  
Vol 112 ◽  
pp. 53-62 ◽  
Author(s):  
Yasuyuki Nishi ◽  
Genki Sato ◽  
Daishi Shiohara ◽  
Terumi Inagaki ◽  
Norio Kikuchi
Keyword(s):  
Free Surface ◽  
Flow Field ◽  
Axial Flow ◽  
Free Surface Flow ◽  
Hydraulic Turbine ◽  
Surface Flow ◽  
Performance Characteristics ◽  
Collection Device

scholarly journals DEVELOPMENT OF A NUMERICAL MODEL FOR THE STUDY OF AN OSCILLATING WATER COLUMN DEVICE CONSIDERING AN IMPULSE TURBINE

2019 ◽  
Vol 18 (1) ◽  
pp. 99
Author(s):  
A. L. dos Santos ◽  
L. A. Isoldi ◽  
L. A. O. Rocha ◽  
M. N. Gomes ◽  
R. S. Viera ◽  
...  
Keyword(s):  
Numerical Model ◽  
Energy Conversion ◽  
Water Column ◽  
Numerical Study ◽  
Velocity Ratio ◽  
Power Coefficient ◽  
Working Fluid ◽  
Speed Ratio ◽  
Oscillating Water Column ◽  
Impulse Turbine

The present work brings a numerical study of an energy conversion device which takes energy from the waves through an oscillating water column (OWC), considering an impulse turbine with rotation in the chimney region through the implementation of a movable mesh model. More precisely, a turbulent, transient and incompressible air flow is numerically simulated in a two-dimensional domain, which mimics an OWC device chamber. The objectives are the verification of the numerical model with movable mesh of the impulse turbine in the free domain from the comparison with the literature and, later, the study of the impulse turbine inserted in the geometry of the OWC device. In order to perform the numerical simulation on the generated domains, the Finite Volume Method (FVM) is used to solve the mass and momentum conservation equations. For the closure of the turbulence, the URANS (Unsteady Reynolds Averaged Navier-Stokes) model k-ω SST is used. To verify the numerical model employed, drag coefficients, lift, torque and power are obtained and compared with studies in the literature. The simulations are performed considering a flow with a Reynolds number of ReD = 867,000, air as the working fluid and a tip speed ratio of λ = 2. For the verification case, coefficients similar to those previously predicted in the literature were obtained. For the case where the OWC device was inserted it was possible to observe an intensification of the field of velocities in the turbine region, which led to an augmentation in the magnitude of all coefficients investigated (drag, lift, torque and power). For the case studied with the tip velocity ratio λ = 2, results indicated that power coefficient was augmented, indicating that the insertion of the turbine in a closed enclosure can benefit the energy conversion in an OWC device.

Effect of the Flow Rate on Performance Characteristics of an Axial Flow Hydraulic Turbine with a Collection Device

2018 ◽  
Vol 2018.26 (0) ◽  
pp. 319
Author(s):  
Hiroto SASASHITA ◽  
Yasuyuki NISHI ◽  
Daishi SHIOHARA ◽  
Terumi INAGAKI ◽  
Norio KIKUCHI
Keyword(s):  
Flow Rate ◽  
Axial Flow ◽  
Hydraulic Turbine ◽  
Performance Characteristics ◽  
Collection Device

scholarly journals A study of the flow field of an axial flow hydraulic turbine with a collection device in an open channel

2019 ◽  
Vol 130 ◽  
pp. 1036-1048 ◽  
Author(s):  
Yasuyuki Nishi ◽  
Genki Sato ◽  
Daishi Shiohara ◽  
Terumi Inagaki ◽  
Norio Kikuchi
Keyword(s):  
Flow Field ◽  
Open Channel ◽  
Axial Flow ◽  
Hydraulic Turbine ◽  
Collection Device

scholarly journals Study on Performance Improvement of an Axial Flow Hydraulic Turbine with a Collection Device

2016 ◽  
Vol 9 (1) ◽  
pp. 47-55 ◽  
Author(s):  
Yasuyuki Nishi ◽  
Terumi Inagaki ◽  
Yanrong Li ◽  
Sou Hirama ◽  
Norio Kikuchi
Keyword(s):  
Performance Improvement ◽  
Axial Flow ◽  
Hydraulic Turbine ◽  
Collection Device

421 Free Surface Flow Analysis of an Axial Flow Hydraulic Turbine with a Collection Device

2014 ◽  
Vol 2014.24 (0) ◽  
pp. 186-189
Author(s):  
Sou Hirama ◽  
Yasuyuki Nishi ◽  
Terumi Inagaki ◽  
Yanrong Li ◽  
Norio Kikuchi
Keyword(s):  
Free Surface ◽  
Flow Analysis ◽  
Axial Flow ◽  
Free Surface Flow ◽  
Hydraulic Turbine ◽  
Surface Flow ◽  
Collection Device

scholarly journals Performance Evaluation of Axial Flow Wind Turbine Integrated with The Condenser

2020 ◽  
Vol 76 (3) ◽  
pp. 85-91
Author(s):  
Budi Santoso ◽  
Dominicus Danardono Dwi Prija Tjahjana ◽  
Purwadi Joko Widodo
Keyword(s):  
Wind Turbine ◽  
Pitch Angle ◽  
Axial Flow ◽  
Power Coefficient ◽  
Speed Ratio ◽  
Air Velocity ◽  
Blade Number ◽  
Ducted Turbine ◽  
Two Parameters ◽  
Blade Pitch Angle

This study investigated the application of an axial flow wind turbine integrated with a condenser. The exhaust air from condenser was used to drive the wind turbine by a ducted turbine system. There were two parameters varied in this work: the blade number and the blade pitch angle. The blade number used was two blades, five blades, and ten blades, while the blade pitch angles were 5°, 10°, 15°, 20°, 30°, and 45°. The diameter of the wind turbine was 495 mm. The model of the condenser had a fan diameter of 600 mm and the range of the average air velocity of 2.01 m/s - 7.86 m/s. The maximum mechanical power was 10.72 W for air velocity of 7.86 m/s. The maximum power coefficient recorded was 0.38 for the tip speed ratio of 1.3 on the blade number of five blades and a pitch angle of 10°. The maximum exhaust air energy recovery was 13.64% of the power consumption of the condenser fan.

scholarly journals 401 Study on Axial Flow Hydraulic Turbine with Collection Device

2012 ◽  
Vol 2012.20 (0) ◽  
pp. 93-94
Author(s):  
Kaoru OKUBO ◽  
Hironobu IWAMOTO ◽  
Yasuyuki NISHI ◽  
Terumi INAGAKI ◽  
Norio KIKUCHI
Keyword(s):  
Axial Flow ◽  
Hydraulic Turbine ◽  
Collection Device
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