High Pressure Fan

Yes.

Time for some reading.

Fans and Blowers - Saylor.org
Page 104.

Aircraft emergency ramps are filled with air. To do this they use a bottle of gas under high pressure ( this gives a greater volume at atmospheric pressure ) BUT even under very high pressure they could not get enough air/gas into the size of bottle they wanted to use. The problem was solved by expanding the air/gas through a nozzle that entrained ambient air with it. This is the same process that a gas burner uses to get an air and gas mix prior to combustion. This method greatly pumped up the volume of airflow.

Dyson now uses this technique for their bladeless fans.

You could look at this method.

Jim

Have you thought of using a leaf blower?

Here's an unusual fan:

Forget the whole thing and put in a fan which discharges at a higher pressure. There are many available. Check http://www.mcmaster.com/

Good Luck, Old Salt

Simply placing one fan after another in a tube will not increase the pressure unless and until a diffuser is placed between both the pumps. Why do you want to invent something already available. A multistage fan will serve the purpose.

Dear Irshad: I have 2 fans, I don't have excess money for my hobies!

try a radial flow blower rather than an axial flow fan

Just bust loose and buy yourself a (ahem) full-blown wind-tunnel - unless of course you're married and plan to spend the rest of your days in the doghouse.

You are building yourself a wind-tunnel, yes? No?

No- but somethink very close to it.

Hello, if you are just searching for a fan look for San Ace Series of counter-rotating fans. This are two fans in a package. The first stage rotates right - the second stage left. No diffuser in between - this would reduce the obtained pressure! They provide high volume and an increase pressure or air speed. But at high sound level. Height of the fan is naturally twice the height of the standard size. You can get PWM controlled units.

In one unit we designed standard 100mm dia. PC type fans reached around 1 to 2 m/sec wind speed in 5cm distance from the exhaust through a 60mm dia. plastic tube. The similar size San Ace counter rotating fan made close to 6m/sec. The pressure could have been higher but due to space constraints we had to use a relative short reducer between the fan with 100mm diameter and the plastic tube of 60mm diameter. To get these data we needed a specially designed dust filter with 20 x 20cm or 4 times the size of the biggest filter offered for the San Ace series featuring a relative fluffy filter mat from a kitchen range hood sandwiched between 2 punched sheet metal grids and an airspace of min. 5cm between dust filter and air intake of the fans. Reducing this distance reduces also the max. wind speed output.

Yes, but remember, the OP does not want to spend money.

Since you are experimenting, try it and measure the output. Tell us how it worked.

If you can figure out an inexpensive way to increase the RPM of your fan, the throughput (CFM) would increase, but I'm not sure about the pressure.