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Low specific speed of turbine implies it is
- a)propeller turbine
- b)impulse turbine
- c)francis turbine
- d)mixed flow turbine
Correct answer is option 'B'. Can you explain this answer?
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Low specific speed of turbine implies it isa)propeller turbineb)impuls...
Pelton turbine is of impulse type.
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Low specific speed of turbine implies it isa)propeller turbineb)impuls...
Impulse Turbine
Low specific speed of a turbine indicates that it is an impulse turbine. Impulse turbines are designed to operate efficiently at low specific speeds, typically below 300. Specific speed is a dimensionless number that characterizes the shape of the turbine runner and is defined as the speed of a geometrically similar turbine which would develop one unit of power under a unit head.
Characteristics of Impulse Turbines:
- Impulse turbines have a high head and low flow rate.
- They operate by converting the kinetic energy of the fluid into mechanical energy.
- The pressure drop occurs only in the nozzles, and the runner receives high-velocity jets of water.
- The runner of an impulse turbine is typically equipped with buckets or blades to capture the kinetic energy of the fluid.
Francis Turbine Comparison:
In contrast, Francis turbines have a medium specific speed and are known as mixed flow turbines. They combine features of both impulse and reaction turbines, making them suitable for a wide range of head and flow conditions.
Therefore, based on the low specific speed of the turbine, it can be deduced that it is likely an impulse turbine, such as a Pelton turbine, designed for high head and low flow applications.
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Low specific speed of turbine implies it isa)propeller turbineb)impulse turbinec)francis turbined)mixed flow turbineCorrect answer is option 'B'. Can you explain this answer?
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