Cavitation in Pumps Teaching Equipment Educational Hydraulic Workbench

AFF068 Cavitation in Pumps Teaching Equipment Educational Hydraulic Workbench 
Description
 visualisation of cavitation effects in a transparent pump
 continuously adjustable pump speed
 closed water circuit

One of the most common causes of cavitation effects are fast moving objects in the water, such as the impellers of a centrifugal pump. If cavitation occurs on the impeller, the high mechanical stress sometimes results in separation or deformation of particles from the surface. In addition to the impeller geometry, intake pressure and temperature are also relevant for the occurrence of cavitation. The AFF068 unit can be used to demonstrate cavitation effects on impellers of centrifugal pumps.Pump housing and the pipe at the inlet side of the pump are made of transparent plastic in order to visualise the cavitation processes. It is possible to capture excellent images of the vapour bubbles by taking photographs with short exposure times (flash).

In order to influence the flow velocity at the impeller blades, the speed can be changed within a wide range via a frequency converter. Valves at the inlet and outlet of the pump enable the flow rate and pressures to be adjusted accordingly.Pressures on the inlet and outlet side are displayed on two manometers. Also displayed are the water temperature in the tank, flow rate and pump speed. The water temperature can be controlled and the tank is fitted with a heater. The water is cooled via the water supply.

Learning objectives/experiments
 formation of cavitation
 observation of cavitation effect
 how speed, inlet pressure, flow rate and temperature affect cavitation

Specification
[1] visualisation of cavitation in centrifugal pumps
[2] transparent pump housing and pipe at the inlet side
[3] open impeller to observe the blades during operation
[4] continuously adjustable pump speed via frequency converter
[5] temperature control via heater and external cooling via water supply
[6] flow measurement using rotameter
[7] display of the pressures at inlet and outlet side of the pump via manometers
[8] digital display of speed, water temperature in the return and flow rate
[9] closed water circuit with tank and temperature display