ways to measure wind speed , and a definition of wind and types of anemometers.

1. University of Babylon
mechanical engineering department
M.sc power course (2020-2021)
seminar on :
(wind speed measurement)
Prepared by Shireen sabah jassim
Under supervision of
Prof.Dr.Dhirgham Alkhafaji

2. Inrtroduction :
• Wind is simply movement of air, but sometimes this movement can
be pretty fast !
• Wind speed is the magnitude of the wind velocity vector.The wind
velocity is a vector, which includes both speed and direction.
• The measurement of wind speed and direction are the most
important factors in weather prediction
• It can be measured by a variety of instruments ;The most common,
complete portable system is the anemometer, which typically consists
of a rotating vane to measure the direction and a shaft with cups
that rotate with the wind to measure its speed. The normal unit of
wind speed is the knot (nautical mile per hour = 0.51 (m/sec) =
1.15(mph)
This Photo by Unknown Author is licensed under CC BY-SA

3. Ways of
measurement :

4. Cup anemometer :
• Wind speed is normally
measured by a cup
anemometer consisting of
three or four cups, conical or
hemispherical in shape,
mounted symmetrically about a
vertical spindle. The wind
blowing into the cups causes
the spindle to rotate. In
standard instruments the
design of the cups is such that
the rate of rotation is
proportional to the speed of
the wind to a sufficiently close
approximation.

5. Wind mills
anemometer:
• The other form of mechanical velocity
anemometer is windmill type or propeller
anemometer
• A windmill is a structure that converts
wind power into rotational energy by
means of vanes called sails or blades,
specifically to mill grain (gristmills), but
the term is also extended to
windpumps, wind turbines and other
applications. The term wind engine is
sometimes used to describe such
devices

6. Wind turbine parts:

8. Windsock : • Windsocks are used to tell wind speed and direction of
speed itself.
• Typically are used at airports to indicate the direction
and strength of the wind to pilots .
• It’s a conical textile tube that resembles a gaint sock

9. Hot wire anemometer
• is a device used for measuring the
velocity and direction of the fluid.This
can be done by measuring the heat loss
of the wire which is placed in the fluid
stream.The wire is heated by electrical
current.
• It works on the principle of transfer of
heat from high temperature to low
temperature.
• The hot wire when placed in the stream
of the fluid, in that case, the heat is
transferred from wire to fluid, and
hence the temperature of wire reduces.
The resistance of wire measures the
flow rate of the fluid.

10. Conclusion:
• Wind is simply movement of air,
but sometimes this movement can
be pretty fast !
• A device for measuring wind speed
is known as an anemometer, and
there are lots of different types.
• Measuring of wind speed at a
height of 10 meters ( standard
height)

11. • This is a high grade electronic
digital anemometer with integral
prime qualityT and RH sensor
revealing air temperatures and
relative humidity levels.
• It is useful for computing ambient
environment, moisture, dew point
temperatures, wet bulb, atmosphere
volume and blowing wind velocity

12. References :
• Hunter, R.S.,Wind speed measurement and use of cup Anemometry.
• Intermediate Energy Infobook, National Energy Education
Development Project, www.NEED.org, (2012) 26
• www.Microsoft.education.com
• Measuring Wind Speed :What is anemometer? | Royal Meteorological
Society (rmets.org)