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Compressible Flow Unit Model FM 79

The single-stage compressor is driven by an integral three-phase AC motor. The compressor speed can be varied using an advanced torque-vector frequency inverter, which gives stable and accurate speed control plus direct electronic read-out of the torque produced by the motor. The compressor is fitted with an outlet duct incorporating a throttling valve, which allows the flow to be varied independent from compressor speed. The equipment is supplied with a convergent divergent test section, fitted at the compressor inlet, designed to produce Mach-1 velocity at the throat. The duct is fabricated from clear acrylic, enabling the student to see the construction and the profiles. A pressure sensing ring tapping is provided at the inlet, at the throat and at the discharge end of the diffuser. This duct allows all the major concepts of compressible flow to be demonstrated.

The electronics console includes two high range and two low-range differential pressure sensors plus a control for motor speed and displays for the compressor speed, the pressures and the motor torque.

Size:

60cm x 45cm x 55cm (LxWxH)

Weight:

35 kg

Item Description

Features

Variable-speed air compressor with accurate electronic speed control
Electronic pressure sensors
Standard unit includes convergent-divergent duct designed to produce Mach 1 velocity at the throat
‘Sci-Cal’ Data logging option available

Sci-tech Compressible Flow Unit Model FM 079 comprises a single stage air compressor, complete with a test section and a throttling valve, plus an electronics console containing the necessary controls and instrumentation. The single-stage compressor is driven by an integral three-phase AC motor. The compressor speed can be varied using an advanced torque-vector frequency inverter, which gives stable and accurate speed control plus direct electronic read-out of the torque produced by the motor. The compressor is fitted with an outlet duct incorporating a throttling valve, which allows the flow to be varied independent from compressor speed. The equipment is supplied with a convergent divergent test section, fitted at the compressor inlet, designed to produce Mach-1 velocity at the throat. The duct is fabricated from clear acrylic, enabling the student to see the construction and the profiles. A pressure sensing ring tapping is provided at the inlet, at the throat and at the discharge end of the diffuser. This duct allows all the major concepts of compressible flow to be demonstrated.

Technical Specifications

Specifications
 investigate flow of compressible fluids
 subsonic and transonic air flow
 variable speed on the radial fan for adjusting the mass flow
 minimized turbulence by drawing in air and optimum arrangement of the measuring objects
 transparent measuring objects with connectors for pressure measurement provide insight into the internal structure
 measuring nozzle for determining the mass flow
 pressure losses in subsonic flow in pipe elbows and various pipe sections
 pressure curve at subsonic and transonic nozzle flow
 orifice for determining volumetric flow rate by differential pressure measurement
 record fan characteristic curve using a throttle valve
 digital displays for pressures, velocity and speed
 Data Logging with educational software and electronic temperature sensors

Technical Specifications
Radial fan
– max. speed: 34000min-1
– max. volumetric flow rate: 206m³/h
– max. head: 271mbar
– max. power consumption: 1,6kW
Measuring objects
– pipe section: 1m, diameter: 16, 24, 34mm
– 90° pipe elbow
– 2 nozzles, inner diameter: 12…34mm with sudden enlargement
– with gradual enlargement (de Laval nozzle)
– orifice with orifice disks, diameter: 12, 19, 25, 32mm
– throttle valve, diameter: 34mm

Measuring ranges
– speed: 0…99999min-1
– pressure: 1x 0…25mbar, 1x 0…200mbar, 1x 0…1000mbar
– velocity: 0…65m/s

Optional: ‘Sci-Cal’ Computer Control Software & Interface

‘Sci-Cal’ software & hardware has been designed for use with more than 600 ‘Sci-tech’ trainers. ‘Sci-Cal’ comes in a module that can be fitted or mounted on the Sci-tech trainers very easily.

‘Sci-Cal’ box has 11 inches front HMI interactive panel, inside are i3 processor computer with it’s own hard drive & software processor with 16 to 32 analog and 16 to 32 digital signal data-loggers. The ‘LabVIEW’ processes the input signal with in-built data and formulae to tabulate results for the Sci-tech trainers.

‘Sci-Cal’ box has HDMI output for connection to a projector or an electronic whiteboard or a monitor.

Experiment Capabilities
– pressure losses in pipes and pipe elbows
– flow in convergent/divergent nozzles
– supersonic flow in the de Laval nozzle
– determine the speed of sound in air
– compare calculation methods for incompressible and compressible flow
– use complete continuity equation
– determine mass flow using nozzle and volumetric flow rate using orifice
– record calibration curve for orifice
– record fan characteristic curve at different mass flows and speeds

Required Services
 Electric Supply 230 V AC, Single Phase, Earthed.

Model Number

FM 79

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Item Description

Technical Specifications

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