In Tube Turbine

http://cr4.globalspec.com/thread/17003/in-tube-turbine

He is the same person but from guest he registered and is a member. Since he did not get satisfactory answers as guest he tries it again after registering. In fact he got the answers but he does not understand them. It would be very interesting to know where comes the air (?) velocity since 200 m/s (in the 1st request it was 200m/h) this is equal to 720 km/h ! It is = 0.6 mach. It is a plane speed !

I wonder how this speed is generated and what would be the reason to use this flow for current generating. If it is for an airborne device then the problem of weight is most important. For such velocities the turbine it self has to have a special design.

You need to place a cone of the same exit diameter at each end of the tube. I don't know the maths on this one, but I know it would be available somewhere on the net!

Spencer.

This was discussed in this thread:

http://cr4.globalspec.com/thread/16953/In-Tube-Wind-Turbine

Hey..............you will need a number of nozzles since a single nozzle with inlet 250mm could stall the turbine. Smaller nozzles strategically placed around the circumfrence if the inlet to the turbine should do the job. You will have to design these nozzles for the desired increase in velocity.....................................they should also be incorporated into the turbine design for optimum contact between inlet air and turbine blades.............................good luck

Perhaps bronislaw could describe his idea in more detail.

200 m/s through a 250mm tube represents a tremendous amount of power. Why extract a (relatively) tiny amount? What is supplying the power -- in other words what is creating the airflow? How is the output being used? What precautions are anticipated for the dangers involved? Is placing the turbine in the airflow going to adversely affect the downstream use for the air flow? (Certainly he cannot be proposing using the output of a small jet engine simply to turn a small generator alone??) Typically, something able to create such substantial airflow will have an accessory drive for an alternator or the like. It would be more efficient to simply drive the alternator mechanically.

Do not bother to ask questions I asked same questions on his previous request but i never got any answer. It should be a quite secret development he is affraid to unveil.

You did what i suggested him to do: evaluate first the amount of energy in its flow since the speed was 200m/h at start.

This is the third post re this topic.

When you post a question, the posting form starts off with several rules and suggestions. One of those is:

• Do not post the same thread multiple times. We will delete duplicate posts.

sory !

I am new to the global spec

I got this nr from a customer,

wil forward the quastions

thanks

That explains much. Two levels of separation.

200m per s X 2.5m is 23,561.9m³ per minute if I didn't error. That is a lot of potential.

As stated more information is needed to give a good answer.

ie. is the 250mm tube moving or not,

is 1-2kW 220V AC all you need or want,

what is the air temp,

does the turbine need to be in the 250mm tube or can a duct to a ducted turbine work?

Thank you for registering. (trying to tell that family of guests apart is frustrating)

Brad