scholarly journals Feasibility of Using Additive Manufacturing to Produce Axial Flow Hydropower Turbine Housing, Runner, and Draft Tube

2020 ◽  
Author(s):  
Phillip Chesser ◽  
Lonnie Love ◽  
Adam Witt ◽  
Paul Roos
Keyword(s):  
Additive Manufacturing ◽  
Draft Tube ◽  
Axial Flow ◽  
Turbine Housing

scholarly journals Studies on S-shaped draft tube for low head axial flow turbine (Internal flow and hydraulic performance)

1986 ◽  
Vol 52 (474) ◽  
pp. 585-592 ◽  
Author(s):  
Yukimaru SHIMIZU ◽  
Takashi KUBOTA ◽  
Fusanobu NAKAMURA ◽  
Shogo NAKAMURA
Keyword(s):  
Draft Tube ◽  
Axial Flow ◽  
Internal Flow ◽  
Hydraulic Performance ◽  
Low Head

scholarly journals Development of new-type S draft tube for low-head axial-flow water turbine.

1991 ◽  
Vol 57 (536) ◽  
pp. 1305-1310
Author(s):  
Yukimaru SHIMIZU ◽  
Hiroyuki ISHIDA ◽  
Yoshiki FUTAKI ◽  
Takashi KUBOTA
Keyword(s):  
Draft Tube ◽  
Axial Flow ◽  
Water Turbine ◽  
Low Head ◽  
New Type

A Theoretical Study of the Performance of an Axial Flow Turbine for a Microhydro Installation

1996 ◽  
Vol 210 (2) ◽  
pp. 121-129 ◽  
Author(s):  
G J Parker
Keyword(s):  
Theoretical Study ◽  
Draft Tube ◽  
Guide Vane ◽  
Turbine Blades ◽  
Axial Flow ◽  
Prototype System ◽  
Blade Angle ◽  
Flow Through ◽  
Loss Coefficients ◽  
Vane Angle

The Bernoulli-with-loss equation, with the losses represented by a constant times the velocity head, has been applied to each section of the flow through a small turbine system consisting of inlet guide vanes, axial flow turbine and draft tube. Using experimental data and the sets of equations, the flow angles around the turbine blades and the loss coefficients in the turbine and in the draft tube were determined. These were used to predict the effect of varying the guide vane angle and the turbine blade angle on performance. They were also used to predict the effects on the performance of a geometrically similar prototype system.

3D CFD Simulation of Gas Hold-up and Mass Transfer in a Modified Airlift Reactor with Net Draft Tube

2019 ◽  
Vol 17 (12) ◽  
Author(s):  
Mehran Nalband ◽  
Elham Jalilnejad
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Cfd Simulation ◽  
Draft Tube ◽  
Axial Flow ◽  
Cfd Modeling ◽  
Reactor Performance ◽  
Simulation Results ◽  
The Impact

Abstract This paper documents CFD simulations of the gas hold-up (ɛg) and volumetric mass transfer coefficient (KLa) for three kinds of airlift reactors (ALRs) namely, conventional ALR, ALR with net draft tube (ALR-ndt), and packed-bed ALR with net draft tube (PBALR-ndt). The 3D two-fluid Eulerian-Eulerian model was adopted to predict the influence of superficial gas velocity on ɛg and KLa. The simulation results were consistent with the trends described previously in the experimental work regarding ɛg and KLa values and a good agreement was obtained (absolute error less than 20 %). Based on the simulation results, axial flow is the dominant flow in the conventional ALR while in ALR-ndt and PBALR-ndt radial flow streamlines are appeared in the reactors due to the presence of concentric net draft tube which improves their performance. The effective role of the net draft tube is proven since consequence of generation of small bubbles by passing through net draft tube is the entrainment of a larger percentage of gas bubbles from the riser into the downcomer which results in improvement of gas holdup and the KLa values. An exponential correlation is used for relating gas hold-up and mass transfer coefficient. Higher power obtained for ALR-ndt and PBALR-ndt (n ≈ 1.22) compared to ALR (n = 0.95) was indicative of high sensitivity of KLa value to gas hold-up in these reactors due to presence of the concentric net draft tube. The CFD modeling is considered to be an invaluable tool allowing us to analyze and visualize the impact of fluidic forces on hydrodynamic properties and consequently, reactor performance.

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