Turbine Speed...

I dare say it would rank this way

1/Gas

2/Steam

3/Water

The limit of the speed is dependent on the materials the turbine is made out of and where the bearings are made...

can any body tell me the no of revolutios (RPM) which maximum can b achieved by medium respectively. (GAS, FLUID and WATER)...

usman47,

Are you perchance related to UsmanS, because your questions are equally non-specific.

You also seem to suffer from the same problem of asking the same question over again without having understood the comments. You give too little information.

The "number of revolutions" that you can get from the different media that you propose will depend on the tip speeds and construction of the machine. For a reasonable estimate, use PWS' limit of Mach 1 in post 2 as the upper limit for the fluid limit and the other limitations will be mechanical which are not guessable without knowing the specific details of the equipment.

To misquote Einstein: Insanity: asking the same question over and over again and expecting a different answer.

Hey Usman,

Gas Turbine - 5100 rpm

Steam Turbine - 3000 rpm

Hydro Turbine - 1000 rpm

Turbo-molecular turbine vacuum pump, 10 000 to 12 000 rpm, gas only, low pressure only.

Guest, you quote typical numbers - I guess related to power generation.

There are many gas turbines, steam turbines and water turbines that turn substantially faster than your quoted numbers.

RB211 engine on the 757 - N₃ runs at about 10,000 rpm.

Elliot produces steam turbines in speeds up to around 20,000 rpm.

The Belgians have a little turbine that produces around 1200 W of mechanical energy at 500,000 rpm. They claim to have achieved 1,200,000 rpm on air bearings.

Don't know enough about hydro turbines to comment, but they are typically much slower.

This all goes to illustrate the utter futility of trying to answer Usman's question as posed.