The main difference between the impulse turbine and the reaction turbine is that,
in the former, there is a pressure drop across the fixed blades only
, whereas in the latter, there is a pressure drop across both the fixed and the moving blades.
What is the correct difference between impulse turbine and reaction turbine Mcq?
| Impulse Turbine Reaction turbine | 07. As water passes over the guide vanes, its relative velocity reduces slightly or remains the same. 07. As water glides over the vanes, its relative velocity increases due to continuous drop in pressure during flow through the blade passages. |
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What is meant by impulse turbine and reaction turbine?
As mentioned above, while an impulse turbine
is capturing energy at only the single point where the water jet is hitting it
, a reaction turbine is capturing energy across the whole wheel at once—which is why a reaction turbine in a hydroelectric plant can produce more power than an impulse turbine of the same size.
What are impulse turbines?
The impulse turbine is
the simplest type of turbine
. It consists of a row of nozzles followed by a row of blades. The gas is expanded in the nozzle, converting the high thermal energy into kinetic energy.
What are the 2 types of impulse turbine?
IMPULSE TURBINE
With no suction on the down side of the turbine, the water flows out the bottom of the turbine housing after hitting the runner. An impulse turbine is generally suitable for high-head, low-flow applications. The two main types of impulse turbine are
Pelton and cross-flow turbines
.
Which is an example of impulse turbine?
Example:
Pelton wheel turbine
. Pelton Wheel Turbine: It is a tangential flow impulse turbine in which the pressure energy of water is converted into kinetic energy to form a high-speed water jet and this jet strikes the wheel tangentially to make it rotate.
Which turbine has highest discharge?
Pelton
has high head and low discharge. Explanation: Based on heads and discharges, turbines are classified into Pelton, Francis or Kaplan. Kaplan has low head and high discharge. Explanation: Francis turbine is a widely used turbine.
Which turbine has highest speed?
Which turbine has highest speed? Explanation:
Francis turbine
has a specific speed of 60 to 300 rpm. Specific speed of Pelton turbine is lowest. Speed of Kaplan turbine is 2 to 3 times more than that of Francis turbine.
Which is better impulse or reaction turbine?
The main differences between Impulse and
Reaction
turbines are, all hydraulic energy is converted into kinetic energy by a nozzle in the Impulse turbine and whereas In Reaction turbine Only some amount of the available energy is converted into kinetic energy.
How many types of reaction turbines are there?
Reaction based turbines include
three subtypes
: Francis turbine, propeller turbine (bulb turbine, Straflo turbine, Kaplan turbine types), and kinetic turbine.
Where is impulse turbine used?
Applications. It is
used worldwide to produce electrical energy in a number of hydro-power plants
. Turbochargers in automobiles uses the pressure energy of exhaust gases through impulse turbine. Where hot and pressurized gases coming out of exhaust are converted into high velocity jet by passing them through nozzle.
What are four types of turbines?
While turbines can be classed as either impulse or reaction according to the way they function, there are four broad types of turbines categorized according to the fluid that supplies the driving force:
steam, gas, water, or wind.
What are the three types of turbine blades?
Turbine blades are classified into three types:
Impulse, reaction, and impulse-reaction
. ducts as turbine blades.
Why it is called impulse turbine?
Unlike other types of turbines which are reaction turbines, the Pelton turbine is known as an impulse turbine. This simply means that
instead of moving as a result of a reaction force, water creates some impulse on the turbine to get it to move
.
What are the classification of turbines?
Reaction turbines are classified as
Francis (mixed flow) or axial flow
. Axial flow turbines are available with both fixed blades (Propeller) and variable pitch blades (Kaplan). Both axial flow (Propeller & Kaplan) and Francis turbines may be mounted either horizontally or vertically.
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) |
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