PRODUCT DESCRIPTION Matrix has designed a compact open circuit sub-sonic wind tunnel designed for benchtop use. The wind tunnel 125 is designed for teaching aerodynamic principles and exploration of fluid flow. Suitable for college to undergraduate teaching. It features a computer-controlled fan, data acquisition and multiple experimental setups, controlled by a touch screen interface. The wind tunnel has a 125mm sq. transparent test section and 25m/s wind speed. The wind tunnel has a honeycomb structure built into the contraction nozzle (ratio 9.2:1) which ensures uniform flow through the test section. The clear test section allows for visibility and clear understanding of the experimental behaviour. The air exits through a variable speed-controlled fan, with a finger guard over the back. Built in data acquisition allows users to have direct output of pressure readings from pitot static tube and pressure tapping’s. It also allows for real time lift and drag force components to be logged. Different drag shapes are provided along with multiple NACA profile aerofoils. Simple thread attachment allows students to design their own test pieces for analysis. A smoke generator which is provided, can be used to create streamline smoke trails over the test objects for visualisation of flow patterns. KEY FEATURES • Built in data acquisition • Touch screen interface • USB and Ethernet connectivity • 25m/s wind speed in test section • Built in pressure sensor • Honeycomb air straighten onto contraction nozzle • Interchangeable experiments • Lift and drag force component module • Computer Controlled angle of attack • Built in experiment storage • Manometer LEARNING OBJECTIVES - Bernoulli’s equation - Air flow over aerofoils - Air flows around blunt and streamlined shapes - Pressure distribution around a cylinder and aerofoil. - Lift and drag forces for blunt and streamlined shapes - Flow visualisation - Manometers WORKSHEET EXERCISES 1. Pitot static tube- Air speed tests, using manometer and built in data acquisition. 2. Pressure tapped aerofoil – NACA0015 aerofoil with 23 pressure tapping’s, with manual angle attack adjustment 3. Drag coefficient- various drag shapes interchangeable on the drag force component experiment, for load cell readout and data acquisition. Comparing different drag coefficients and air flow patterns Shapes included: flat surface, cone, semi-sphere, smooth ball, rough ball, teardrop 4. Lift coefficient- 3 NACA profile wings, one symmetric, allowing for comparisons of lift generated and different angle of attacks, computer controlled. the aerofoils included are: NACA0015, S1223, NACA4415 Lift and drag can be explored together as it’s the same experiment 5. Pressure tapped cylinder- a single pressure tap in the cylinder for 2D analysis of pressure around the object. Leading to exploration of pressure coefficients values. Standard M3 thread on the lift and drag experiment allows for future flexibility, students or lecturers can develop their own models for analysis, such as wing profiles, aerofoils, car spoilers, road signs etc. PACKING LIST • Wind tunnel – pre built • Power cable (UK/EU/USA) • USB cable • Smoke machine • Pitot static tube experiment • Pressure tapped cylinder experiment • Pressure tapped aerofoil experiment • 2 component force experiment with angle of attach numerical control • 3 data acquisition cables • 6 drag shapes • 3 aerofoil shapes ADDITIONAL INFORMATION Size of Wind Tunnel • L: 1.6m • H: 0.44m • W:0.44m Test section • Test section cross sectional area: 125mm x 125mm • Test section length is 180mm • Max Air speed in test section = 25m/s