MR-HM 215 Two-Stage Axial Fan Didactic Equipment Hydraulic Workbench Description • two axial fans in series configuration or in individual operation • three-hole probe for determiningpressure and velocity profile Axial fans are connected in series inplants to increase the pressure. In theory, connecting two fans in seriesdoubles the pressure increase. The HM 215 trainer allows the investigation of a two-stage axial fan. A measuring device is used to determine the pressure and velocity distribution. The trainer includes a measuring section with two identical axial fans. Thecarefully designed nozzle contour and aflow straightener at the air inlet ensurea uniform velocity distribution with littleturbulence in the measuring section. The rotors are equipped with individuallyadjustable blades to change the angle ofattack. The fans are equipped with outletguide vane systems. These guide mechanisms redirect the angular momentumof the outflow in the axial direction andallow an increase in pressure. A pipebend may optionally be installed to rotate the flow at the outlet of the measuring section. One of the fans can be removed from the measuring section sothat the remaining fan can be studied inindividual operation. In the measuring section there aremeasuring connections to detect the differential pressures and temperatures. The flow rate is measured via an inletnozzle. The differential pressure and theangle of attack are detected radially atrotors and guide vane systems bymeans of the 3-hole probe. This enablesthe display of different pressure and velocity profiles. The measured values areread from digital displays and can at thesame time be transmitted via USB directly to a PC where they can be analysed using the software included. Learning objectives/experiments • determining the fan characteristic • series configuration or individual operation of axial fans • determining the energy balance • determining the radial pressure andvelocity distribution on rotor and guidevane system by means of a probe • effect of the blade position Specification [1] investigate two-stage axial fan [2] 2 identical single-stage fans in series configurationor individual operation [3] individually adjustable blades [4] fans both with variable speed via frequency converter [5] flow-optimised nozzle and flow straightener forsmooth, low-turbulence flow [6] air flow in the pipe section can be adjusted viathrottle valve [7] optional pipe bend at the outlet for flow deflection [8] measuring device with three-hole probe for determining the differential pressure on rotor and guidevane system [9] sensors for pressure and temperature upstreamand downstream of each fan [10] volumetric flow rate measured via inlet nozzle [11] GUNT software for data acquisition via USB underWindows 7, 8.1, 10 Technical data 2 fans • drive motor rated output: 3,45kW • max. pressure difference: 798Pa • speed: 0…2850min-1 • blade angle adjustable up to 39° Measuring section inner diameter: 400mm Measuring ranges • temperature: 0…100°C • differential pressure: ±25mbar • radial position of the probe: 100…200mm 400V, 50Hz, 3 phases 400V, 60Hz, 3 phases LxWxH without pipe outlet: 4325x970x1800mm Length with pipe outlet: 5225mm Weight: approx. 250kg Required for operation PC with Windows recommended Scope of delivery 1 trainer with 2 fans 1 pipe bend 1 measuring device 1 set of measuring hose with quick-release couplings 1 CD with GUNT software + USB cable 1 set of instructional material
