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Research Papers: Flows in Complex Systems

The Effect of Midplane Guide Vanes in a Biplane Wells Turbine

[+] Author and Article Information
Tapas K. Das

Wave Energy and Fluids Engineering Lab
(WEFEL),
IIT Madras Ocean Engineering Department,
IIT Madras,
Chennai 600036, India
e-mail: mech.tapas@gmail.com

Abdus Samad

Wave Energy and Fluids Engineering Lab
(WEFEL),
IIT Madras Ocean Engineering Department,
IIT Madras,
Chennai 600036, India
e-mail: samad@iitm.ac.in

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received May 8, 2018; final manuscript received September 24, 2018; published online November 16, 2018. Assoc. Editor: Riccardo Mereu.

J. Fluids Eng 141(5), 051107 (Nov 16, 2018) (13 pages) Paper No: FE-18-1330; doi: 10.1115/1.4041600 History: Received May 08, 2018; Revised September 24, 2018

Guide vanes (GVs) improve the performance of a turbine in terms of efficiency, torque, or operating range. In this work, a concept of different orientations of GVs in between a two-row biplane wells turbine (BWT) was introduced and analyzed for the performance improvement. The fluid flow was simulated numerically with a commercial software ANSYS CFX 16.1. The Reynolds-averaged Navier–Stokes equations with the k-ω turbulence closure model were solved for different designs and flow conditions. For the base model, the results from simulation and experiments are in close agreement. Among the designs considered, the configuration, where the blades are in one line (zero circumferential angle between blades of two plane) and the midplane guide vane has concave side to the leading edge of the blade, performed relatively better. However, the performance was still less compared to the base model. The reason behind the reduction in performance from the base model is attributed to the blockage of flow and the change of flow path occurring due to the presence of the midplane GVs. The flow analysis of different cases and the comparison with the base model are presented in the current study.

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Figures

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Fig. 1

Ref-1 and Ref-2 BWT

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Fig. 2

Schematic representation of different geometric cases for analysis (dimensions in mm)

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Fig. 4

Velocity diagram for BWT with and without GV

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Fig. 3

Computational domain and mesh: (a) computational domain without GV, (b) computational domain with GV, and (c) mesh around the rotor blade

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Fig. 5

Validation with experimental result

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Fig. 6

Comparison of different cases with reference

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Fig. 7

Streamlines on suction surface of blade at φ= 0.225

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Fig. 8

Velocity contour at 75% blade span for φ= 0.225

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Fig. 9

Tangential vorticity contours at midchord for different flow coefficients

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Fig. 10

Q-criterion isosurface colored by velocity magnitude at different flow coefficients

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Fig. 11

Streamlines at 75% blade span for different flow coefficients

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Fig. 12

Blade loading curve at 50% blade span (φ= 0.225)

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