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 HM 261 Nozzle Pressure Distribution
 Technical Description
The benchtop unit HM 261 enables compressible flow in nozzles to be investigated. A wide range of inlet and outlet pressures can be set with a pressure controller and a needle valve. Easily interchangeable nozzle models (one convergent and two convergent-divergent) are equipped with pressure tappings so the pressure distribution along the flow can be determined. Manometers on the front panel indicate the pressures for air inlet and outlet and up to eight pressures in the nozzle. The air inlet and outlet temperatures are measured using thermocouples and displayed digitally. The airflow rate can be determined using a rotameter. The unit is driven with compressed air.
Learning Objectives / Experiments
· Flow in convergent-divergent nozzle
· Flow in convergent nozzle
· Pressure distribution in a nozzle
· Effect on temperature
· Demonstration of choking phenomenon
· Demonstration of under-expansion
· Demonstration of over-expansion with re-compression
· Relationship between inlet pressure and mass flow rate
· Relationship between outlet pressure and mass flow rate
· Speed of sound and shock wave
 Features
Demonstration of choking effect
Supersonic flow
 Alternative products
HM 230 -- Compressible Flow Unit
HM 260 -- Nozzle Performance Study System
 Specification [1] Investigations on compressible flow in nozzles [2] lxwxh 800x450x830mm, 35kg [3] 3 nozzles fitted with pressure tappings: 1 convergent, 1 short/1 long convergent-divergent [4] 85-230V, ~50/60Hz [5] Compressed air: 69bar, approx. 5g/s Technical Data Measurement ranges - temperature: 050°C (via thermocouple K) - pressure: 2x010bar, 8x -19bar - airflow: 0.78.3g/s Inlet pressure controller 012bar Dimensions and Weight l x w x h: 800 x 450 x 830 mm Weight : approx. 35 kg Scope of Delivery 1 benchtop unit, 3 nozzles, 1 instructions manual Order Details 070.26100 HM261 Nozzle Pressure Distribution