Mechmatics Engineering Private Limited

Specification :

• Wind Tunnel Acrylic Rectangular Test Section
• Traverse Mechanism
• Pitot Tube with Calibration
• U Tube Manometer with Stand (100 cm)
• Trolley

Smoke Generator can be used to visualize air streamline characteristics on different surfaces. Part of supply includes   Control Panel;  Feed Bottle, fuel flow control pipe; Smoke Probe, flexible pipe, pipe connector, smoke probe holder

Wind tunnel is a facility for creating a uniform wind of known value in a test section where fluid flow phenomena can be investigated, models, of Aircrafts etc., can be tested from their performance, and also students training/teaching in fluid mechanics/aerodynamics. The facility can also be used for industrial aerodynamics testing and simulation studies on many of fluid problems.

The main part of the tunnel are Honey comb section, screens, contraction cone, test section, diffuser, safety screens, fan section, fan, motor and speed control drivers.
KEY SPECIFICATION
Computerised Data System Type of tunnel: Open circuit-suction type.Test section size: 0 - 1500 mm (As per Need)Maximum speed: 0- 50 m/secFan: Axial flow fan, Maximum rpm 1440Contraction Ratio: 9:1

The Wind tunnel was developed for experimentation and demonstration purposes in the fields of aerodynamics and fluid mechanics. It is a subsonic, open wind tunnel with a square measurement section profile. Overall length is 4.5 meters with 1 mtr test section. The extensive range of available accessories permits the performance of numerous experiments, e.g.:

• Methods of velocity measurement and Anemometry
• Determination of drag coefficients of different bodies (disc, sphere, streamlined object, aerofoil)
• Determination of drag and lift coefficients of aerofoils at different angles of attack
• Pressure distribution with flow around cylinders and aerofoils
• ExamFalling Sphere Viscometerination of boundary layers along flat plate

A wind tunnel essentially consists of the following:

• Prechamber with flow straightener
• Jet
• Measurement section
• Diffuser
• Fan

Funnel, jet and diffuser are made of MS. To provide access to the closed measurement section, the sliding guide permits adjustment of jet and funnel together with the measurement section. The flow straightener has a tubular honeycomb structure. The measurement section is made of perspex glass.The axial fan is provided with a downstream guide which makes it highly efficient and producing low noise. The fan is driven by an AC motor. A frequency converter or dimmer stat permits adjustment of rotational speed and thus air velocity. The fan is rigidly connected to the diffuser and both are attached to the laboratory trolley using rubber elements. This effectively provides shielding of vibrations and guarantees extremely smooth running. The switch box contains main switch, emergency stop, speed control and fan switch are located. A smoke generator is also provided

The inclined-tube manometer is used to indicate the current air speed at the entrance to the measurement section. The wind tunnel is installed on a laboratory trolley that is easy to move. The trolley is provided with shelves and lockable drawers for storing measuring instruments, models and other materials.

• Wind Tunnel Test Section from 150 mmm x 150mm upto 1500 mm x 1500 mm
• Mounting for various instrumentation
• Transperant Walls

The balance consists of the triangle platform connected to the rotating frame through the rods and pivot flexures. A wind tunnel model is connected to the triangle platform by two support struts: the main support strut and the tail support strut.

An optimized way of using 6 Load cell, which in turn uses change in resistance due to elongation which is measured in terms of voltage across that, can be recalibrated to the force applied. A set of forces at a distance causes couple thus even moments can be measured.

 

 

These balances are designed specifically for use in small to medium sized wind tunnels having cross sections of about 150 to 1200mm. The load sensing elements are high precision, strain gauged load cells with excellent repeatability and linearity characteristics and are temperature compensated for a temperature range of 0 to 60 C.
The geometrical construction of the load sensing systems allows the complete separation and independent measurement of the components of Lift, Pitch and Drag with negligible interactions of one component into another.

Load Ranges:
A combination of any of the three component load ranges shown may be incorporated at manufacture.
Component with Ranges

LIFT
0 – 90 / 120 / 180 / 240 N
DRAG
0 – 30 / 60 / 120 N

PITCHING MOMENT
0 – 2.5 / 5.0 / 10.0 Nm

The above figures are typical only as each balance is designed and manufactured to customer specific requirements. Different load ranges can usually be accommodated.

The six component Balance fits onto the working section of Subsonic Wind Tunnel. The six components Balance provides an easy-to-use support system for wind tunnel models. It measures lift, drag, side force, pitching moment, yawing and rolling moment exerted on the model. A mechanism constrains it to move in a plane parallel to the bottom plate only, while leaving it free to rotate about a horizontal axis. This arrangement provides the necessary three degrees of freedom. The forces acting on the model are transmitted by rods to six strain gauged load cells. The output from each load cell is taken via an amplifier to a PLC controlled display module. The display module mounts onto the wind tunnel control and instrumentation frame and includes a digital display to show the lift, drag and pitching moment directly.
Key Specifications

Measurement (Max Range)
Lift Force (0-50 kg) Drag Force (0-10 Kg) Pitching Moment (0-150 kg-cm) Side Force (0-6 kg) Yawing Moment (0-20 kg-cm) Rolling Moment (0-20 kg-cm)

The axial and lateral turbulence are reduced and smooth flow of air entering the test section is achieved by installing the honeycomb and screens for most efficiency and efficiencies of the air inlet. The ratio of length to wall size of the honey comb is maintained as per the recommended standards. The wire mesh is also fixed to smoother the flow further. This is particularly, useful for obtaining laminar flow. The duct is secured to the test section by flange. The provision is also made for easy removal of diffuser and diffuser for possible separation from the test section, when required. It is also highly smothered and painted.

Flow Straightner with Settling chambers for wind tunnels
L/D Ratio as per standards
Avaialble in Square, Round, Hexagon and rectangular fashion
Sturdy ribs for mounting in ducts