Blow Down Wind Tunnels

About Blow Down Wind Tunnels

A high-performance blow-down type open-circuit wind tunnel engineered for advanced aerodynamic research and experimental flexibility. Designed with an upstream centrifugal blower, the system enables precise airflow control and supports specialized applications such as liquid spray, particulate injection, and flow visualization studies.

Key Features

• Blow-Down Configuration: Upstream-driven airflow for enhanced testing versatility
• Custom Test Section: Modular geometry with integrated model mounting options
• Injection Capability: Ideal for multiphase flow experiments (liquid/particle)
• Flow Conditioning System: Multi-stage airflow smoothing for stable test conditions
• Expandable Design: Provision for additional turbulence control elements

Technical Datasheet (Typical Ranges)

Performance

• Airspeed Range: 10 to 120 m/s (customizable up to ~200 m/s)
• Turbulence Intensity: 0.5% to 2.5% (application dependent)
• Flow Uniformity: 1% across test section

Blower System

• Type: Centrifugal blower (upstream mounted)
• Drive: High-efficiency electric motor with VFD control
• Power Range: 5 kW to 250 kW
• Speed Control Accuracy: 0.5%

Test Section

• Cross-Section: 0.3 m 0.3 m to 2 m 2 m (customizable)
• Length: 0.5 m to 5 m
• Construction: Transparent acrylic / glass / metal options
• Mounting: Integrated model support & instrumentation ports

Flow Conditioning

• Wide-Angle Diffuser: Multi-stage velocity reduction and pressure recovery
• Honeycomb Straightener:
• Material: Aluminium
• Cell Diameter: 310 mm
• Length-to-Diameter Ratio: 6:1 to 10:1
• Turbulence Screens:
• Standard: 2 stainless steel screens
• Expandable: Up to 4 screens

Applications

• Aerodynamic testing (subsonic regime)
• Spray, combustion, and particulate flow studies
• Thermal and environmental simulations
• Academic and industrial R&D

Customization Options

• High-speed data acquisition systems
• Force balance and pressure measurement integration
• Temperature/humidity control modules
• Acoustic treatment and noise reduction