Inlet passage shapes (water and air)

[USCGRET/E8]

I believe the hot gases create the power when there is a separate power turbine behind the base turbine. As better explained by these guys:http://aardvark.co.nz/pjet/turbine4.htm
Keep in mind, any kind of propulsion prop blades need to be shaped like a wing so as to creat a low presure side and a high presure side (like a sail).
A turbine blade is thus so shaped as shown here http://www.grc.nasa.gov/WWW/K-12/airplane/powturb.html
If you want to send the info on that inventer, I'm pretty good at finding things on the web.

[kach22i]

Originally Posted by USCGRET/E8

If you want to send the info on that inventer, I'm pretty good at finding things on the web.

I'll try to find it today, not even http://www.zabasearch.com/ worked last time.

Not exactly right out of my sketch book (and wall of clay models), but similar. I can see some of the Joint Strike Fighter layout being doubled here and scaled down.

http://www.rutherford-research.ca/rr...paceDesign.php

One factor, for some specialized UAVs, may be the ability to hover, land vertically, or possibly dock with some form of airborn platform.

Nuclear UAV's? :blink:

[kach22i]

Originally Posted by USCGRET/E8

http://www.grc.nasa.gov/WWW/K-12/airplane/powturb.html

I've never seen a turbine blade so thick and with holes, any ideas on this baby?

[USCGRET/E8]

I've never seen a turbine blade so thick and with holes, any ideas on this baby?

It looks like a major attemp to keep it cool, so probably a blade for the power turbine wheel vs a compressor turbine wheel.

[kach22i]

Originally Posted by USCGRET/E8

It looks like a major attemp to keep it cool, so probably a blade for the power turbine wheel vs a compressor turbine wheel.

Or it could be for low speed rotation and high angles of attack.

EDIT: I stand corrected.

http://www.globalsecurity.org/milita.../1-506/ch3.htm

Nozzle vanes may be either case or forged. Some vanes are hollow (Figure 3-18) to allow a degree of cooling by compressor bleed air. In all cases the nozzle assembly is made of very high-temperature, high-strength steel to withstand the direct impact of the hot high-pressure, high-velocity gas flowing from the combustion chamber.

[kach22i]

The "inlet" is what this thread is supposed to be about, but that ignores the fan/thruster and the exhaust path (swirling to straight is best).

By now you might of guessed everything is on the table. You can find the strangest sources on the Internet and apply them to your application.

Polythene ducted ventilation in piggeries
http://www.wisil.recumbents.com/wisi.../naca-duct.htm

[USCGRET/E8]

fan/thruster and the exhaust path (swirling to straight is best).

A definite plus to the internal prop (impeller) is taking the swirl out of the discharge. This used on the water jets, hence absolutely no steering torque transmitted to the steering wheel.

[USCGRET/E8]

Changing the intake flow of water.

The water intake on these ships was in the foils. The water exited out the stern of the hull. Note the speed for a 133 foot vessel!
http://navysite.de/pboats/phm1.htm

[kach22i]

I found this today............

http://marinejettech.com/IntelliJET%...%20History.htm

Why It All Works Together

Bigger jets are desirable because they create higher thrust. But the bigger the jet, the more power that is lost in the ordinary inlet duct. This power loss has to be made up by the motor and the pump.

The adjustable inlet duct reduces this power loss. And, as the inlet duct becomes more efficient, it increases pressure on the nozzle, which results in higher flow through the system.

But, higher flow through the system results in reduced pump efficiency. Hence the need for the variable nozzle to regulate the system flow for pump efficiency.

Summary: Using the combination of these three innovations means a high volume of water, an efficient inlet duct and an efficient pump operation under all operating conditions.

[kach22i]

Model form........

http://www.westbourne-model.co.uk/mo...Jet-Drives.htm

[kach22i]

I don't think these were ever built, I see some problems.

http://www.aiaa.org/tc/vstol/unbuilt...t/index_a.html

[kach22i]

Another way to skin a cat.............

http://www.marinetalk.com/articles-m...0123645TU.html

The Hydro Air Drive is highly efficient at high speeds because the inlet water does not have to bend upward and has less wetted area friction compared to the inlet water flowing into the fully submerged standard water-jet rotor.

[kach22i]

Tell me all about Diagonal or Mixed Flow Fans and Compressors

Are they more efficient than an axial fan with a 90 degree elbow discharge and stator vanes to straighten the flow?

How do the pressure recovery losses compare? My meaning here is which fan (Diagonal or Axial) has a superior ability to draw air into it's self? This condition may be found in serpentine or convoluted ducted air intakes found in scaled RC aircraft.

http://en.wikibooks.org/wiki/Jet_Propulsion/Compressors

As the name might suggest, a diagonal (or mixed) flow compressor is a cross between an axial and centrifugal compressor, where the flow takes a diagonal route through the compressor, exiting diagonally (rather than radially) at a significantly higher higher mean radius than at inlet. The compression process is part axial and part centrifugal.

So far, only a few examples of these units have been tested worldwide. They do, however, offer the advantage of a relatively high pressure ratio per stage, without the need for a relatively large diameter exit diffuser, which can cause installation problems.

http://en.wikipedia.org/wiki/Diagona...low_compressor

From Wikipedia, the free encyclopedia
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A diagonal or mixed-flow compressor is effectively a cross between a centrifugal and axial-flow compressor. The American term diagonal-flow is very apt, because these compressors combine both axial and radial velocity components. The prime advantage is the relatively small diameter across the exit diffuser, compared with that of the equivalent centrifugal compressor. A diagonal-flow compressor is featured in the Pratt & Whitney Canada PW610F turbofan, recently certified for the Eclipse 500 Very Light Jet aircraft.

Real Life Example:
http://www.jinzhoufan.com/doce/index02.htm
XLT2 Diagonal-Flow Fire-Protection Fan

Compared with centrifugal fans and axial-flow fans of the same number and power, the flux of XLT2 Diagonal-Flow Fan is higher than the former and the full pressure is higher than the latter. The figure dimension is relatively small and the weight is between the centrifugal and axial-flow ones. Owing to the sound structure, this type of fans has relatively low noise, high efficiency and smooth operation when running. It is the new product to replace axial-flow and mixed-flow fans.

　　Thanks to the topping quality, new structure and easy installation, it is widely used in factories, mines, hotels and underground facilities of tall buildings as well as the distant series installation in relatively long vent pipes so as to increase the full pressure in the pipe.

Computer fans:
http://www.arrow.net.bz/aws/resource...ering/ebm.html

With cooling demands constantly increasing, tubeaxial fans are becoming incapable of meeting today’s tougher needs. The fan speed for a tubeaxial has to be increased to meet the current flow and pressure requirements, but this makes it impossible to meet power and acoustic goals. The solution—diagonal fans from ebm-papst.