Additional information
| Brand | Essom |
|---|
Subsonic Wind Tunnel: Upstream Fan
The wind tunnel is an open circuit upstream fan type, designed for studying the subsonic aerodynamics. It is to be used with optional accessories and models below.
An axial flow fan delivers air through a diffuser, aluminum tube flow straightener, three wire mesh screens and a high contraction ratio section to ensure uniform velocity across the transparent test section. The diffuser and contraction sections have a high quality internal finish to minimize the boundary effects. The fan impeller blades are of an aerofoil design cast aluminum to ensure maximum aerodynamic efficiency and minimum turbulence. The fan speed is adjustable by an inverter.
Four equally spaced static pressure taps are connected to a manifold to minimize effects from a model and air speed is indicated by an inclined manometer and a calibration graph. Models are mounted on two components load cell support with digital display for measurement of drag and lift. Model holder can be rotated to allow quick change on the angle of incidence, this angle is indicated on an angular scale.
The wind tunnel is mounted on a steel table on wheels.
Instruction manual is also included.
TYPICAL EXPERIMENTS
- Pressure and velocity measurement.
- Estimation of drag coefficients of various bodies, e.g. sphere, hemisphere, disc, plate, streamlined shape etc.
- Estimation of drag lift and pitching coefficients of an aerofoil.
- Pressure distribution around an aerofoil or a cylinder.
- Effects of instability of a “flutter Wing”.
- Investigation of boundary layer at a flat plate by measuring total head distribution.
- Stream lines visualization using a smoke generator.
- Wakes behind models.
TECHNICAL DATA
| Fan: | |
| – Diameter | 500 mm |
| – Impeller | Single stage, aerofoil aluminum blade |
| Contraction area ratio | 7:1 |
| Test Section | 300 mm x 300 mm x 600 mm long, transparent on three sides |
| Maximum air velocity | Over 30 m/s |
| Measuring instruments | |
| – Water manometer | Twin type |
| – Wind velocity | Contraction section differential pressure with inclined water manometer and velocity calibration graph (to be used with inclined water manometer above) |
| – Sensors with digital display | |
| – Lift and drag | Two component balance with model holder for measurement of lift and drag |
| Software for data display and analysis by computer (separately supplied). | |
| Power supply | 220 V, 1 Ph, 50 Hz. Other power supply is available on request. |
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The first shaft is a hot gas generator. Inlet air through an orifice flow measuring device is compressed by a single stage radial flow compressor. The turbine is motor started and runs on Jet A fuel. Fuel is injected by a fuel pump and ignited in the combustion chamber providing hot gas for a single stage axial flow turbine which inturn drives the compressor. The hot gas is discharged axially to a larger power turbine on the second shaft and exhausts to atmosphere. A fan is provided for cooling the gear box.
Speed of the power turbine is reduced by the gear box. A water brake absorber is connected to the gear box for power measurement. The brake requires outside water supply. Load is manually controlled.
An Electronic Control Unit (ECU) controls the basic turbine operation. Additional instruments are provided for monitoring and controlling turbine performance.
A touch screen computer with an interface unit and software are provided for speed and load control, data display and analysis, and to assist the ECU.
Safety features include clear acrylic cover, gas generator over speed shutdown, power turbine over speed protection and power turbine entry over temperature shut down. The unit is floor standing with removeable supports.
Instruction manual is also included.
TYPICAL EXPERIMENTS- Understanding the thermodynamic process.
- Torque vs speed.
- Power input and output and engine efficiency.
TECHNICAL DATAGas generator construction – Diffuser High strength aluminium. – Combustion chamber Stainless steel – Bearings Ceramic ball bearing. – Turbine wheel Vacuum cast inconel. – Compressor High grade aluminium alloy. Gas generator – Starting and running fuel Jet A or kerosene with jet oil. Power turbine – Turbine wheel Vacuum cast inconel, – Interstage guide vane Stainless steel. Gear box – Type Planetary. – Lubrication Jet A. Dynamometer – Type Water brake absorber. – Maximum power Approx. 5 kW. Gear box and dynamometer connection. Direct coupling Output power – Mechanical Approx. 700 W. Sensors – Temperatures Inlet air, diffuser exit, gas generator turbine entry, power turbine entry and exit. – Pressures Diffuser exit, power turbine entry and exit. – Speeds Gas generator and gear box output shaft. – Dynamometer torque. – Fuel flow rate. – Air flow rate Differential pressure at inlet orifice. Accessories - Engine cooling fan
- Gear box cooling fan
- Engine exhaust duct
- 2 Ear muffs
- Jet oil
- Barometer
Software for data display, analysis and control by computer (separately supplied) Power supply 220V, 1 Ph, 50Hz. Other power supply is available on request (0 reviews) -
Air Flow and ThermodynamicsShell and Tube Heat Exchanger
The apparatus is used for studying heat transfer through a shell and tube heat exchanger under parallel or counter flow conditions.
The unit consists of a shell and tube heat exchanger and a service module. The module comprises a hot water tank with a transfer pump and instruments for monitoring and control. Parallel and counter flow is by switching cold water hoses with quick coupling. The unit requires outside water supply.
Instruction manual is also included.
TYPICAL EXPERIMENTS- Demonstration of heat transfer under parallel and counter flow.
- Determination of heat transfer coefficient.
- Effects of flow rate and temperature difference.
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- Cold water
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