ABOUT SERVICES PRODUCTS EXPERIENCE CAREERS CONTACT CLOSED CIRCUIT WIND TUNNELS With complete design freedom to meet your unique specifications and needs HOME > PRODUCTS > LOW SPEED > CLOSED CIRCUIT WIND TUNNELS AEROLAB specializes in custom-made closed circuit wind tunnels (CCT). The use of steel for construction offers complete design freedom to meet your unique specifications and needs, such as low overhead clearance or building support columns. Most AEROLAB CCT designs are traditional single-return, horizontally arranged circuits. However, any configuration is possible. As with all AEROLAB wind tunnels, exceptionally steady test section flow with close uniformity of velocity is standard. Turbulence level is typically below 0.10 percent throughout the full tunnel speed range. Contact AEROLAB with your ideas (size, speed, shape) for a free, custom-made quote. Advantages of Closed Circuit Tunnels with comparison to Open Circuit Tunnels Power requirement for a given speed is lower. Particulate matter can be contained within the circuit. Noise is significantly lower. Laboratory air movement (air vents, doors, windows, etc.) does not affect wind tunnel flow. Air entering the test section is free of laboratory dust. Fan blades are not as vulnerable to damage from model failure. Disadvantages of Closed Circuit Tunnels with comparison to Open Circuit Tunnels Cost is generally three times greater for a given test section size. Air supply is recycled which can be prohibitive when working with combustion engines. Footprint is much larger and requires more overall space. Increasing air temperature can become an issue during prolonged use. Performance Specifications Airspeed Range : customer-defined Turbulence Level: typically < 0.1% Contraction Contraction ratio (inlet-to-outlet area ratio) is a major driver in the overall size and complexity of a closed circuit tunnel. Power requirements, accordingly, follow. AEROLAB uses either a fifth, or, ninth-order polynomial to define a smooth transition between the settling chamber (contraction inlet) and the test section entrance. Brochure See the Closed Circuit Wind Tunnels brochure. Get an estimate. Fill out our form to get a customized quote. Request a Quote Type Low Speed Subsonic Performance Specifications Airspeed Range: customer-defined Turbulence Level: typically < 0.1% See the Closed Circuit Wind Tunnels brochure Low Speed Wind Tunnel Testing Authored by Aerolab's Principal Design Expert Buy on Amazon Questionnaire The following questionnaire is intended to streamline the initial design process of your new AEROLAB Closed-circuit Wind Tunnel. Please answer the questions as carefully and thoroughly as possible and maintain a common units system (ex. Inches, feet, meters, pounds, etc.). Please double-check all measurements and include additional information and/or photographs as needed to facilitate understanding. Test Section Dimensions What are the internal dimensions of the test section (LxWxH)? Length millimeters (mm) centimeters (cm) meters (m) inches (in) feet (ft) Width millimeters (mm) centimeters (cm) meters (m) inches (in) feet (ft) Height millimeters (mm) centimeters (cm) meters (m) inches (in) feet (ft) Tunnel Speed What are the Minimum/Maximum operational tunnel speeds? Maximum Tunnel Speed kilometers per hour (kph) meters per second (mps) knots mock number feet per second (fps) miles per hour (mph) Turbulance Level 2% 1.5% 0.1% 0.05% Flow Uniformity 2% 1% 0.5% 0.25% Balance Will an internal & external Force/Moment balance (available from AEROLAB) be installed? If so, please describe the desired specifications. View AEROLAB's Force/Moment Balances Internal External Both Model Positioning System Will a Model Positioning System (Available from AEROLAB) be installed? If so, please describe the desired specifications. View AEROLAB's Model Positioning System Yes No Traverse System Will a test section traverse system (available from AEROLAB) be installed? View AEROLAB's Traverse System Yes No Cooling System Will cooling be employed? Yes No Installation Site Information Describe, dimensionally, the intended installation site. Is it indoors or out? Indoors Outside If possible, please provide photographs of the site. Drop files here or Select files Max. file size: 50 MB. Describe the intended installation route. Provide dimensions of bottlenecks such as overhead piping, support beams, corners, doorways, etc. Also, if possible, please provide photographs of the route. Drop files here or Select files Max. file size: 50 MB. Components of a closed-circuit wind tunnel can be heavy. Please describe the installation site floor (material, thickness, calculated allowable load limit, etc.). Is the intended installation site large enough to remove the turbulence-reducing screens once the tunnel has been positioned? The screen width is approximately the same as the width of the contraction. Yes No What electrical power is currently available at the installation site? Please provide inputs for voltage, amperage, and frequency if possible. Can it be upgraded if needed? Yes No Your Contact Information Your Name* First Last Email* Phone* Company / Organization* Additional Notes WHAT WE OFFER For over 60 years, Aerolab has prepared and engineered wind tunnels and related equipment with precision. View Our Services CAREERS AT AEROLAB We're seeking well-rounded, team players with both the technical and people skills the thrive in a company that’s producing cutting edge aerodynamic research equipment. View Openings GET IN TOUCH Speak with our experts about your next project, or ask questions about our products and services. Contact Us GET IN TOUCH HEADQUARTERS 8291 Patuxent Range Rd Jessup, Maryland 20794 USA contact@aerolab.com phone 301-776-6585 fax 301-776-2892 PRODUCT TYPES Balances Entertainment High Speed Low Speed Models & Probes Smoke Generator Subsonic Wind Tunnels Specialty Tunnels/Equipment Software NAVIGATION About Services Products Experience Careers Contact Sitemap Privacy Policy Accessibility Statement © 2021 Aerolab. All Rights Reserved. Website by Yoko Co By continuing to browse the site you are agreeing to our use of cookies and similar tracking technologies described in our Privacy policy.I Agree