specfic speed

1. what is the specific speed of the water turbine? what is the formula to calculate the specific speed of the turbine.

Depends on the the turbine, the water source used to power it and what it is driving.

2. What will be the specific speed of Frances Turbine, Pelton Wheel, Kaplan Turbine,

See answer to question 1.

3. Specific speed will be less than <1 or greater than >1

Greater or less than 1 what?

dear guest,

In order to give meaningful answers to your question, we need some actual details of the installation you propose, (size, shape, type, what it is to be used for, water source, flow rate, head etc).

Without specifics, you may as well as the question

'How long is a piece of string?'

With relevant details we may be able to help.

1.Specific Speed is a term related to speed of a Hydraulic Turbine Type.

It is equal to the Speed of aturbine of a given type,but of a size that of a head H=1Metre

For Example :

Let us find the Specific Speed of a Turbine whose Speed is n,Head H metre ,Power=unknown--

Then n_s/n= ( D÷D_s).(1/H)^0.5 ---where D_s--is the diameter of a turbine with Power rating=1h.p.

after juggling with units we get n_s=n/H(N_hp/√H)^0.5 _. Here N_hp is N shown in HP (N kwx1.36)

2 Sp. Speeds are__

Francis(Radial/Axial)------ 400>80

Pelton Wheel (Impulse) -- 50>10

Kaplan(Adjustible-Bladeaxial Flow) 1200>450

Hi Mukulmahant,

Fascinating, I learnt something new today!