Action turbines operate according to the principle of equal pressure. The static pressures at the inlet and at the outlet of the rotor are equal.
The experimental unit is placed upon the base unit. The two units together provide the basic experiments to get to know the operating behaviour and the most important characteristic variables of action turbines.
The water jets are discharged at high velocity from the four nozzles of the distributor. The water jets are deflected in the rotor and put it in motion. The axially discharged water from the rotor can be observed.
Learning Objectives And Experiments
- Principle of operation of an action turbine
- Characteristic curves at constant head
- Relationship between torque and speed
- Efficiency dependent on speed
- Flow rate dependent on speed
- Hydraulic power and mechanical power dependent on speed
- Evaluation of measuring values and characteristics based on the theory
- Partial load behaviour with controlling the number of nozzles in comparison to throttle control
Specification
- Turbine to place upon the base unit
- Functioning and operating behaviour of an action turbine
- Transparent housing for observing the rotor
- Distributor with 4 nozzles, active nozzles adjustable by valves
- Constant pressure of the turbine represents in practice the head and is adjusted
- Turbine load using the wear-free and adjustable eddy current brake
- Force sensor to determine the torque on turbine shaft
- Optical speed sensor for measuring the turbine speed
- Water supply, flow rate measurement and unit-specific software data acquisition and operation
Technical Data
- Turbine
- power output: approx. 28W at 3600min-1
- rotor diameter: 50mm
- Measuring ranges
- torque: 0…0,5Nm
- speed: 0…9000min-1
