Reaction turbines
are generally used for sites with lower head and higher flows and are the most common type currently used in the United States. The two most common types of reaction turbines are Propeller (including Kaplan) and Francis. Kinetic turbines are also a type of reaction turbine.
Which turbine is used in low head plants?
Propeller turbine
Since they can reach very high rotation speeds, propeller turbines are effective for low heads. Consequently, this type of turbine is suitable for run-of-river power stations.
Which turbine is low head?
Kaplan turbine
: This turbine is a propeller-type turbine which has adjustable blades to achieve efficiency over a wide range of heads and flows. The Kaplan can be used at low to medium heads (1.5–20 metres) and medium to high flows (3 m3/s–30 m3/s).
Why Kaplan turbines are used for low heads?
Kaplan turbines could technically work across a wide range of heads and flow rates, but because of other turbine types being more effective on higher heads, and because
Kaplan’s are relative expensive
, they are the turbine of choice for lower head sites with high flow rates.
Which turbine is used for low head and high discharge?
Kaplan has low head and high discharge. Explanation:
Francis turbine
is a widely used turbine.
Is the example of low head turbine?
Reaction turbines run fully immersed in water, and are typically used in low-Head (pressure) systems with high Flow. Examples include
Francis, Propeller and Kaplan
. … Impulse turbines are typically used with high-Head systems and use nozzles to produce the high-velocity jets. Examples include Pelton and Turgo.
Which turbine has highest speed?
The specific speed of
Kaplan turbine
ranges from 600 to 1000 rpm. It is a low head axial flow turbine. From the table, we can conclude that the Kaplan turbine has the highest specific speed.
Where low head is available is used?
Low Head. Low head dams are usually classified as systems with head differences of around 10 meters or less. These low head hydro turbines are generally used in facilities such as
run-of-the-river systems where there is a flowing river with little elevation change
.
What do you mean by low head turbine?
Low Head turbines are
hydropower turbines which have been developed for small-scale exploitation of rivers or irrigation canals
. … These turbines have been developed for low water heads – below 10 metres- but large flows of water (Sanchez, 2009). Turbines are low-cost and easy to install.
What is specific speed of turbine?
The specific speed value for a turbine is
the speed of a geometrically similar turbine which would produce unit power (one kilowatt) under unit head (one meter)
. The specific speed of a turbine is given by the manufacturer (along with other ratings) and will always refer to the point of maximum efficiency.
Which turbine is used for high head?
| Hydropower Turbine Type Typical Site Characteristics | Kaplan turbine Low to medium heads (1.5 – 20 metres) Medium to high flows (3 m 3 /s – 30 m 3 /s) For higher flows multiple turbines can be used. | Pelton/Turgo turbine High heads (greater than 25 metres) Lower flows (0.01 m 3 /s – 0.5 m 3 /s) |
|---|
What is the difference between Francis and Kaplan turbines?
Efficiency of
Kaplan turbine is higher than Francis turbine
. Kaplan turbine is more compact in cross-section and has lower rotational speed to that of Francis turbine. In Kaplan turbine, the water flows axially in and axially out while in Francis turbine it is radially in and axially out.
Is propeller a turbine?
The propeller turbine is
a type of inward flow reaction turbine with a propeller-shaped runner
, which can be seen in ships and submarines. … In the propeller turbine, the water flow is regulated by adjustable guide vanes (or wicket gates). The vanes move the water into the runner to transfer its energy to the blades.
Is the example of LOHE turbine?
Pelton Wheel Turbine
is high head low discharge turbine. High head turbine: In this type of turbine, the net head varies from 150m to 2000m or even more, and these turbines require a small quantity of water. Example: Pelton wheel turbine.
Are the quantities which are obtained when the head on the turbine is only?
Explanation: Yes,
Unit power
is developed by the turbine when the head of the turbine is unity. Unit power is one of the major quantities that influence the overall efficiency of the turbine and thus, plays an important role.
Which turbine is low specific speed turbine?
This is used to compare the different types of turbines as every type of turbine has different specific speed. So option C is correct as
Impulse turbine
has the lowest specific speed.
