The Scientific World Journal

Research Article

Mathematical Analysis of the Effect of Rotor Geometry on Cup Anemometer Response

Table 2

Results of the calibrations performed on the Climatronics 100075 and Ornytion 107A anemometers from [21]. The calibration constants, , , and , are indicated together with the simplified anemometer factor, , and some geometric characteristics of each rotor tested (cup radius, , cup center rotation radius, , and the ratio between them, ). The coefficients of the linear fittings to the calibration constants, , , , and , are also included in the table; see expressions (4) and (5) in the text.


Rotor	[mm]	[mm]		[m pulse⁻¹]	[m s⁻¹]	[m rev⁻¹]		[rev⁻¹]	[m rev⁻¹]	[s⁻¹]	[m s⁻¹]

Climatronics 100075

20/40	40	40	0.5000	0.0310	0.2593	0.9295	3.70	31.16	−3.107 10⁻¹	4.845	6.327 10⁻²
20/50	40	50	0.4000	0.0420	0.3010	1.2592	4.01
20/60	40	60	0.6667	0.0518	0.3562	1.5526	4.12

25/40	50	40	0.6250	0.0293	0.2867	0.8777	3.49	29.90	−3.125 10⁻¹	4.279	5.717 10⁻²
25/60	50	60	0.4167	0.0495	0.2567	1.4850	3.94
25/80	50	80	0.3125	0.0697	0.3387	2.0909	4.16
25/100	50	100	0.2500	0.0890	0.5447	2.6692	4.25

30/40	60	40	0.7500	0.0279	0.1900	0.8361	3.33	29.34	−3.243 10⁻¹	3.918	2.034 10⁻²
30/60	60	60	0.5000	0.0481	0.1559	1.4425	3.83
30/80	60	80	0.3750	0.0682	0.2167	2.0464	4.07
30/100	60	100	0.3000	0.0866	0.3731	2.5991	4.14
30/120	60	120	0.2500	0.1064	0.4731	3.1922	4.23

35/60	70	60	0.5833	0.0461	0.1642	1.3833	3.67	30.24	−4.157 10⁻¹	2.157	1.579 10⁻²
35/80	70	80	0.4375	0.0674	0.1754	2.0210	4.02
35/100	70	100	0.3500	0.0873	0.2003	2.6200	4.17
35/120	70	120	0.2917	0.1067	0.2997	3.1997	4.24

40/60	80	60	0.6667	0.0454	0.1376	1.3633	3.62	29.80	−4.194 10⁻¹	2.002	2.061 10⁻²
40/80	80	80	0.5000	0.0653	0.1864	1.9601	3.90
40/100	80	100	0.4000	0.0859	0.2221	2.5781	4.10
40/120	80	120	0.3333	0.1052	0.2539	3.1557	4.19
40/140	80	140	0.2857	0.1248	0.3040	3.7455	4.26

Ornytion 107A
20/40	40	40	0.5000	0.4809	0.2739	0.9617	3.83	30.19	−2.406 10⁻¹	13.24	−2.675 10⁻¹
20/50	40	50	0.4000	0.6396	0.3707	1.2792	4.07
20/60	40	60	0.6667	0.7827	0.5387	1.5654	4.15

25/40	50	40	0.6250	0.4477	0.1479	0.8954	3.56	30.02	−2.955 10⁻¹	8.317	−1.682 10⁻¹
25/60	50	60	0.4167	0.7584	0.3513	1.5168	4.02
25/80	50	80	0.3125	1.0571	0.5058	2.1141	4.21
25/100	50	100	0.2500	1.3489	0.6509	2.6978	4.29

30/40	60	40	0.7500	0.4313	0.0702	0.8625	3.43	29.43	−3.003 10⁻¹	6.252	−1.867 10⁻¹
30/60	60	60	0.5000	0.7363	0.1824	1.4727	3.91
30/80	60	80	0.3750	1.0397	0.2957	2.0795	4.14
30/100	60	100	0.3000	1.3143	0.4646	2.6285	4.18
30/120	60	120	0.2500	1.6139	0.5543	3.2278	4.28

35/60	70	60	0.5833	0.7074	0.1848	1.4148	3.75	29.74	−3.497 10⁻¹	2.086	6.902 10⁻²
35/80	70	80	0.4375	1.0275	0.2796	2.0549	4.09
35/100	70	100	0.3500	1.3173	0.2182	2.6347	4.19
35/120	70	120	0.2917	1.6022	0.3444	3.2044	4.25

40/60	80	60	0.6667	0.6794	0.1500	1.3588	3.60	30.04	−4.254 10⁻¹	1.910	3.058 10⁻²
40/80	80	80	0.5000	0.9936	0.1902	1.9873	3.95
40/100	80	100	0.4000	1.3001	0.2174	2.6003	4.14
40/120	80	120	0.3333	1.5906	0.2359	3.1812	4.22
40/140	80	140	0.2857	1.8830	0.3191	3.7659	4.28