Wind Tunnel Facility

AIWTEC MEANS & SERVICES

wind tunnel facility

General Presentation

Recirculating tunnel

See level pressure

Test section 200×200

wind tunnel facility

can generate

supercooled droplets

ice crystals

mixed

rain

speed

cold weather

operating envelope

IWT capabilities following ARP5905 presentation

	UNIT	MIN	MAX
Airspeed (Mn) range	/	0.05	0.65
SAT (°C) range	[°C]	+15°C	-60°C
Altitude range	[Pa]	N/A	N/A
Supercooled Liquid Water generation
Liquid Water Content (LWC)	[g/m3]	0.1	10
Median Volume Diameter (MVD)	[μm]	10	200
Ice Crystal Generation
ICC	[g/m3]	1	10
MMD	[μm]	200	400
RAIN
LWC	[g/m3]	2	50
MVD	[μm]	150	300

AERO THERMAL PARAMETERS – CALIBRATION

Before tests

PRESSURES

Total & Static pressures measurements
in tested probe section. Total pressure in
convergent entrance

TEMPERATURES

Total temperature measurements at
convergent entrance

Correlation done with de-iced TAT measurements in the test section

During tests

Permit to control / adjust speed airflow and temperature regulation

AERO-THERMAL-pARAMETERS – CALIBRATION

MVD – CALIBRATION

Before tests

Water quantity is measured to reach requested LWC

MVD is set by adjusting air pressure

During tests

Permit to cover

FZDZ < 40μm
FZDZ > 40μm

Bi-modal PSD examples

LWC – CALIBRATION

Mass of ice measurement

LWC>3g/m3 catch collection method

By mean of opened catch tube in finite volume

0,1<LWC<3g/m3 ice deposit method

By mean of calibrated saber

LWC – CALIBRATION CORRELATIONS

Nephelometer

• LWC measurement measurement of cloud droplet size distribution
• Tested in 2006 / 2009 / 2012 /
2017

FSSP

• Measurement of cloud droplet size distribution
• Tested in 2006

Many correlation had been done in IWT

ZT608

• Tested in 2012
• LWC measurement

ZU601

• Measurement of cloud droplet size distribution
• Tested in 2012

ILIDS

• Measurement of cloud droplet size distribution
• Tested in 2012

King probe

• LWC measurement
• Tested in 2006

CLOUD – CALIBRATION

Mass of ice location

Cloud uniformity is obtained on a dedicated grid

Grid step are compliant with ARP5905

Cloud location can be customized function of the requirement

cloud-calibration-1

cloud-calibration-2

LWC AND MVD – CONTROL

During tests

MVD is controlled with Malvern instrument

LWC is controlled by water flow measurement

lwc-and-mvd-control-3

immd-calibration-1

IMMD – CALIBRATION

Before tests

IMMD calibration is obtained

by collecting ice crystal with different mesh sizes sieves.

ICC – CALIBRATION

Before tests

ICC calibration by crystal collection method

By means of closed catch tube during defined duration

ICC – CALIBRATION CORRELATION

IKP (Iso Kinetic Probe) Correlation

IKP campaign realized in 2015

Good correlation up to very high ICC

Correlation realized

up to 20g/m3

Better than 10%

up to 5g/m3 on dedicated speed

icc-calibration-correlation-1

ICC – CALIBRATION CORRELATION

HSI Correlation

HSI correlation had been done in the IWT: better than 3% on IMMD

icc-calibration-correlation-2jpg

immd-calibration-1

IMMD / ICC – CONTROL

During tests

IMMD is controlled by fixed mesh size of the system which generated crystals

IMMD is not function of the ICC following HSI correlation

ICC control is secured by controlling electrical input parameters for generator devices

speed rotation for grinding