Water Turbine Specific Speed

ENGINEERING – PUMP & TURBINE CALCULATOR Water Turbine Specific Speed A precise tool.
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What is the Water Turbine Specific Speed & How does it work?

The specific speed of a water turbine is a dimensionless parameter that characterises the shape and speed of the runner required to achieve a given power output at a particular head. It enables engineers to compare turbines of different sizes and operating conditions on a common basis.

By evaluating the specific speed, designers can quickly identify the most suitable turbine type—Pelton for high‑head, low‑flow applications; Francis for medium head and flow; or Kaplan for low‑head, high‑flow situations. This selection directly influences efficiency, cost, and longevity of the installation.

Enter the rotational speed, power, and net head into the fields below, select the turbine type, and press calculate. The tool will compute the specific speed using the standard power‑based formula, helping you verify that your design falls within the optimal range for the chosen turbine family.

N_s = frac{N sqrt{P}}{H^{5/4}}
N_s = specific speed (dimensionless)
N = rotational speed (rpm)
P = power (kW)
H = net head (m)
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Parameters
Result —
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Frequently Asked Questions
What is water turbine specific speed?
It's a dimensionless parameter that characterizes the shape and speed of a water turbine runner.
How do I use this calculator?
Input the power output and head to determine the specific speed of your water turbine.
What turbine type is suitable for high-head applications?
A Pelton turbine is typically used for high-head, low-flow situations.
Can this calculator help in selecting a turbine type?
Yes, by evaluating the specific speed, it helps identify the most suitable turbine type for your conditions.
What is the significance of specific speed in water turbines?
It allows engineers to compare different turbines on a common basis and choose the optimal design for efficiency.
How does specific speed relate to flow rate?
For low-head, high-flow applications, a Kaplan turbine is suitable as it operates efficiently under these conditions.
What are the benefits of knowing the specific speed of a water turbine?
It aids in selecting the right turbine type and size for optimal performance and efficiency.

Results are for informational purposes only and do not constitute professional advice.