Climatic Wind Tunnels (CWT)

Vehicle undergoing snow ingestion testing.

MIRA has two state of the art climatic wind tunnels (CWT). These facilities allow our customers to test their products under a wide range of wind speeds while exposed to different global environmental conditions. This enables customers' development time-scales to be further compressed, delivering 'right first time' products into markets faster and more cost effectively than their competitors. 

The climatic wind tunnels (CWTs) can simulate a wide range of environmental conditions with the added advantages of full solar spectrum simulation, humidity control, chassis dynamometer, hot road simulation, snow generation and tailpipe exhaust emissions. CWTone's integrated soak room allows pre-conditioning of multiple vehicles to maximise use of the test chamber.

MIRA's climatic wind tunnels
are large enough to test a
variety of military vehicles.

The climatic wind tunnels are used by our customers for development and validation testing of HVAC systems (heating, ventilation and air-conditioning), powertrain cooling, military habitability trials, snow packing/ingestion testing, climatic exhaust emissions, defrost/demist testing, hot fuel handling, cold start and driveability and a whole range of general environmental testing. Use of the climatic wind tunnels allows our customers to do everything they could do with in-territory testing but with the added advantages of guaranteed, repeatable conditions and lower overall development costs. 
 

Climatic Wind Tunnel (CWT) Specifications


CWTone  
Max vehicle dimension Width 2.7m, Height 3m, Length 6.2m
Vehicle wheelbase Maximum 5m, Minimum 2m
Gross vehicle weight 8000kg
Air speeds
Primary = 150km/h
Secondary = 200km/h
Air temperature Max/Min +55ºC/-40ºC
Chassis dynamometer Twin-axle (150kW DC per axle), 1.6m dia. rollers (FWD
Humidity range 5% to 95% RH
Solar simulation
Quartz halogen, visible and IR
Range: 0.6 to 1.0kW/m2
Target area: 1.8m x 5.2m
Data acquisition Ipetronik CAN system 160 channels, 20Hz to 5KHz depending on channel type
Hot-road simulation                                                              Underbody heating up to 30ºC above chamber temperature
Minimum speed: 0km/h (idle/city bypass system operating)
Circuit type Vertical return, fully enclosed within support building
Fan type Axial flow, 2.6m dia. 400kW
Airflow nozzle
Primary = 4.0m2
Secondary = 2.5m2
Cooling systems 765kW capacity. Twin rotary-screw compressors with heat exchangers
Soak room
Temp range: -40ºC to +55 ºC
Dimensions: 12.0m x 6.7m  
Emissions
Gasoline, LPG, CNG and gasoline hybrids
All world legislative test cycles & customer drive cycles
Analysis of dilute emissions (HC, CH4, NOx, CO and CO2
European Type VI cold (-7ºC) HC and CO test
US Federal cold (-7ºC) CO test
US Federal Supplement test: US06 and SC03
Hot and cold emissions development testing

CWTtwo  
Chamber dimensions Width: 8.0m, Height: 6.0m, Length: 19.5m
Chamber entrance door dimensions Width: 4.2m, Height: 4.7m
Gross vehicle weight 62 tonnes
Air speeds
1.5m² nozzle = 165kph
2.5m² nozzle = 120kph
5.0m² nozzle = 70kph
Air temperature Max/min = +50°C/-35°C
Humidity range
5% to 95% Relative Humidity
Chassis dynamometer
Single-axle, 48” dia. Rollers
Maximum vehicle wheel track width = 2.7m.
Dynamometer maximum absorption
Power, DC machine   225kW 
Tractive effort, DC machine   10kN 
Power, friction brake  375kW
Tractive effort, friction brake  45kN
Dynamometer combined absorption
Power  600kW
Tractive effort 55kN
Solar simulation
Quartz halogen, visible and IR
Range: 0.6 to 1.2kW/m²
Target area: 2.5m x 6.0m
Data acquisition 124 channels, up to 10Hz scan rates
Circuit type Horizontal, fully enclosed within support building
Fan type Axial flow, 310kW
Cooling systems 1.1MW capacity at 20°C