Aerodynamic Analysis of Cup Anemometers Performance: The Stationary Harmonic Response

Table 2

Geometrical characteristics of the rotors tested: cup center rotation radius, 𝑅_𝑟𝑐, front area of the cups, 𝑆_𝑐, cup radius (conical and porous cups), 𝑅_𝑐, ratio of cup radius to the cups’ center rotation radius (conical cups), 𝑅_𝑐/𝑅_𝑟𝑐, hole diameter of porous cups, ℎ, and semi-major and semi-minor axes, 𝑎 and 𝑏, of elliptical cups. See also Figure 2.

Conical cups
Rotor	𝑅𝑐 [mm]	𝑆𝑐 [mm^2]	𝑅𝑟𝑐 [mm]	𝑅𝑐/𝑅𝑟𝑐
c-20/30	20	1256.6	30	0.667
c-20/40	20	1256.6	40	0.500
c-20/50	20	1256.6	50	0.400
c-20/60	20	1256.6	60	0.333
c-25/40	25	1963.5	40	0.625
c-25/50	25	1963.5	50	0.500
c-25/60	25	1963.5	60	0.417
c-25/80	25	1963.5	80	0.313
c-25/100	25	1963.5	100	0.250
c-30/40	30	2827.4	40	0.750
c-30/50	30	2827.4	50	0.600
c-30/60	30	2827.4	60	0.500
c-30/80	30	2827.4	80	0.375
c-30/100	30	2827.4	100	0.300
c-30/120	30	2827.4	120	0.250
c-35/50	35	3848.5	50	0.700
c-35/60	35	3848.5	60	0.583
c-35/80	35	3848.5	80	0.438
c-35/100	35	3848.5	100	0.350
c-35/120	35	3848.5	120	0.292
c-40/50	40	5026.5	50	0.800
c-40/60	40	5026.5	60	0.667
c-40/80	40	5026.5	80	0.500
c-40/100	40	5026.5	100	0.400
c-40/120	40	5026.5	120	0.333
c-40/140	40	5026.5	140	0.286
Elliptical cups
Rotor	𝑎 [mm]	𝑏 [mm]	𝑆𝑐 [mm^2]	𝑅𝑟𝑐 [mm]
a-27/60	27	23.15	1963.5	60
a-30/60	30	20.83	1963.5	60
a-35/60	35	17.86	1963.5	60
Porous cups
Rotor	𝑅𝑐 [mm]	𝑆𝑐 [mm^2]	𝑅𝑟𝑐 [mm]	ℎ [mm]
h-9/60	25	1963.5	60	9
h-19/60	25	1963.5	60	19
h-24/60	25	1963.5	60	24