What is the ranges of specific speed of Pelton Francis & Kaplan turbine?

Specific speed of a Pelton turbine ranges from. 12 to 70. 80 to 400.

What is the speed ratio of Kaplan turbine?

Explanation: A Kaplan turbine requires a speed ratio of 2. Kaplan Turbine: If the water flows parallel to the axis of rotation of the shaft, the turbine is known as an axial flow turbine.

What is the range of speed ratio KU for a Kaplan turbine for its most efficient operation?

(d) 1.40 to 2.00 As, Speed ratio for kaplan turbine depend upon the…

What is specific speed range of Francis turbine?

For a Francis turbine, the variations of geometrical parameters like have been described earlier. These variations cover a range of specific speed between 50 and 400.

Is Kaplan turbine a low head axial flow turbine?

When the vanes on the hub are adjustable then the turbine is known as the Kaplan turbine and when the vanes are fixed to the hub then the turbine is known as the Propeller turbine. Kaplan turbine is a low head axial flow turbine with adjustable vane.

What is the ratio of speeds?

When a machine has two gears of different sizes, the smaller gear turns faster than the larger gear. When the first gear (the driver or input gear) turns, the second gear (the driven or ouput gear) turns in response. The difference between the speeds of the two gears is called the speed ratio or gear ratio.

What is speed range ratio?

Speed Range (Ratio) 50:1 – This specification means that the DC Drive has the ability to reduce the base speed of the motor from full speed to 1/50th of that speed. For example, a 1750 RPM base speed motor can be reduced in speed to 35 RPM. Example: 1\% of base speed is 17.5 RPM.

What is type of flow in Kaplan turbine?

The Kaplan turbine is an inward flow reaction turbine, which means that the working fluid changes pressure as it moves through the turbine and gives up its energy.

What is runaway speed of Francis turbine?

The runaway speed is generally more than 150\% of the synchronous speed. However, the acceleration rate for axial and other radial flow turbines may vary because this rate depends on the rotating masses, the load and the operating condition.

What are the characteristics of Kaplan turbine?

A Kaplan turbine designed with a shape factor (power specific speed) of 3.0 (rad), a runner tip diameter of 4.4 m, and a hub diameter of 2.0 m, operates with a net head of 20 m and a shaft speed of 150 rev/min. Pobitra Halder, M.M.K. Khan, in Advances in Clean Energy Technologies, 2021

What is the specific speed of a turbine?

Using the specific speed formula, a turbine designed to deliver 100,000 horsepower (74,600 kilowatts) with a head of 40 feet (12.2 metres) operating at 72 revolutions per minute would have a specific speed of 226, suggesting a propeller or Kaplan turbine.

How do you select a turbine?

Turbine selection on the basis of specific speed. Initial turbine selection is usually based on the ratio of design variables known as the power specific speed. In U.S. design practice this is given by where n is in revolutions per minute, P is the output in horsepower, and H is the head of water in feet.

What is the difference between Kaplan machine and tubular machine?

The efficiency of the tubular turbine is similar to that of the Kaplan machine. The principal subdivisions of the tubular machine are as follows: The bulb turbine.