Aerodynamic Analysis of Cup Anemometers Performance: The Stationary Harmonic Response

Table 3

Calibration coefficients, 𝐴 and 𝐵, measured for the rotors tested with Climatronics 100075 anemometer (see also Table 2 and Figure 2). The coefficient of determination, 𝑅², of the curve fittings, and the slope of the transfer function based on the rotation frequency, 𝐴_𝑟 (see expressions (1) and (2)), have also been included.

Conical cups
Rotor	𝐴 [m/pulse]	𝐴𝑟 [m/rev]	𝐵 [m/s]	𝑅^2
c-20/30	0.02021	0.60618	0.37096	0.99995
c-20/40	0.03177	0.95318	0.23328	0.99999
c-20/50	0.04186	1.25574	0.31148	0.99999
c-20/60	0.05180	1.55401	0.40091	0.99999
c-25/40	0.02963	0.88886	0.26760	0.99999
c-25/50	0.03932	1.17970	0.20786	0.99999
c-25/60	0.04961	1.48829	0.24245	0.99999
c-25/80	0.06964	2.08928	0.39438	0.99999
c-25/100	0.08952	2.68552	0.53685	0.99999
c-30/40	0.02861	0.85818	0.09551	0.99995
c-30/50	0.03861	1.15844	0.19606	0.99999
c-30/60	0.04850	1.45505	0.14823	0.99998
c-30/80	0.06836	2.05089	0.25403	1.00000
c-30/100	0.08697	2.60900	0.38253	0.99998
c-30/120	0.10738	3.22145	0.49053	0.99999
c-35/50	0.03720	1.11603	0.19081	0.99999
c-35/60	0.04719	1.41582	0.15354	0.99999
c-35/80	0.06827	2.04818	0.18132	0.99998
c-35/100	0.08737	2.62111	0.22168	0.99999
c-35/120	0.10742	3.22259	0.34171	0.99999
c-40/50	0.03539	1.06166	0.13714	0.99999
c-40/60	0.04586	1.37587	0.16652	0.99999
c-40/80	0.06663	1.99876	0.16932	0.99998
c-40/100	0.08668	2.60026	0.23292	0.99996
c-40/120	0.10638	3.19140	0.28805	0.99996
c-40/140	0.12639	3.79164	0.34162	0.99995
Elliptical cups
Rotor	𝐴 [m/pulse]	𝐴𝑟 [m/rev]	𝐵 [m/s]	𝑅^2
a-27/60	0.05221	1.56617	0.19932	0.99999
a-30/60	0.05306	1.59167	0.23224	0.99998
a-35/60	0.05412	1.62361	0.21593	0.99998
Porous cups
Rotor	𝐴 [m/pulse]	𝐴𝑟 [m/rev]	𝐵 [m/s]	𝑅^2
h-09/60	0.05445	1.63352	0.31414	0.99999
h-19/60	0.06579	1.97376	0.54539	0.99998
h-24/60	0.11763	3.52881	0.31563	0.99998