Windtunnel built for a semiconductor manufacturers

Technical data:

Spezifikation:

Type:

• Vertical positioned low speed wind tunnel
• „Göttinger type“ open working section inside of an closed metering box
• the wind tunnel is partly heat insulated
• all up weight - 250 Kg
• a heat exchanger controlls the air inside of the tunnel
• calculation of velocity via differential pressure

Fan motor and fan:

Singel stage, fix set radial fan with backwards bent blades.

Speed:	n = ca. 3000 U/min
Engine capacity:	Pw = ca. 3,0 Kw
D.C. motor with tachometer generator infinitely variable via a control unit. The speed variation of the motor is compensated with an exact tachometer generator and the control unit.
Accuracy of the tachometer generator (factory set)	1% of meas. value
Consistency of the tacho signal	approx. +/- 0,1 % of meas. value
Speed variation	better than 0,1 % of limit value

Working section and fluidic ratings:

Diameter of jet outlet:	320 mm
Usable Diameter of jet outlet:	305 mm
Actual length of the working section:	420 mm
max. flow speed:	v = 0...15 m/s
Speed Referenz:
Vane anemometer MiniAir:	0,3...20 m/s

Turbulence ratio at approx. 1...15 m/s:	Tu < 0,6%
below 1 m/s:	Tu ca 0,8 ..1 %
Contraction:	8
Heating of the jets resigning air:	20°C...65°C

Accuracy of the thermostat 1°C
Manufacturer of the temperatur unit : (Huber)

The windrunnels funtions are controlled with LabView

isolated windtunnel

Pressure windtunnel 6 bar

Functionality:

The windtunnel can be pumped up to a absolute static pressure of 6 bar controled by a manostat.

The air temperature can be controlled

The airs actuation inside of the windtunnel is effected by a Singel stage, fix set and compression proofed radial fan.
Three phase fanmotor (accuracy 0,1 % of the measured value)
The controller has an external set point input of 0...10 Volt.
Accuracy of the tachometer generator (factory set) 1% of meas. value

The cooling of the air being heated by the friction at the tunnels inner surfaces is effected by an aerodynamical cooling system (automatic)
The measuring section can be depressurised to change the sensors using a ball valve
The tunnels pressure stays at the former value!
The reference for velocity and volume flow is an extremly accurate measuring turbine (1 % accuracy)

High pressure windtunnel built for S-Tec (November 2007)

LDA Measuring

The measuring section has been measured with an LDA, to determine the probes positions and their correction factors.
It is possible to calibrate 4 probes simultaneously!

inspection window for LDA measurement

Technical data:

Diameter of jet outlet:	ca. 150 mm
Velocity at the jet´s outlet:	30 m/s (controlled)
Operating pressure:	6 bar (controlled)
Operating temperature:	20 C° (controlled)
Drive capacity:	ca. 15 KW
cooling capacity:	ca. 10 KW
Turbulence ratio:	ca. 1 %
Flow quality:	repeatable accurate flow measured shortly behind the jet´s outlet