Performance Analysis of H-Type Darrieus Turbine Radial Projection Blades Based on NACA 0018

Abstract

The H-type Darrieus turbine is a vertical wind
turbine that is used to convert wind energy into mechanical
energy by utilizing lift force. This research is aimed at making a
modified H-type Darrieus turbine blade model from a NACA
0018 profile blade to a NACA 0018 blade with a chordline
projected radially to the turbine diameter and the second result
is to compare the performance of the NACA 0018-based radial
projection blade to the performance of the NACA 0018 blade.
This is preparation for searching literature, design making,
manufacture of NACA 0018 blade test specimens and NACA
0018 based radial shadow blades, assembly and installation of
test equipment, testing and data collection of wind turbine
performance, data processing and analysis, final results. The
variables tested were wind speeds of 7 m/s, 8 m/s, 9 m/s, 10 m/s,
11 m/s, 12 m/s. The test results show that the higher the TSR, the
higher the resulting power coefficient (Cp) until the maximum
Cp is reached. After that, the increasing TSR, the resulting Cp is
getting smaller. The test results show that projection blades
based on NACA 0018 and NACA 0018 blades produce a small
maximum Cp, respectively 0.082 and 0.124 compared to the
Darrieus turbine maximum Cp reference on the vertical turbine
characteristic chart, which is 0.4. The NACA 0018-based radial
projection produces a lower Cp than the NACA 0018 blade at
speeds of 7 m/s, 8 m/s, 10 m/s, 11 m/s, 12 m/s. At a wind speed of
9 m/s the projection blade based on NACA 0018 produces a
higher power coefficient than the NACA 0018 blade. Projecting
the NACA 0018 blade chordline on the track causes the blade
cross-sectional area and chordline length to shrink. The higher
the wind speed, the smaller the resulting Cp. The solidwall
phenomenon affects turbine performance. Testing without load
at all wind speeds, the projection blade based on NACA 0018
produces higher rotation than the NACA 0018 blade. The
parameter of the blade momentum affects the results of the
turbine rotation when tested without load.