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- Water_brake abstract "A water brake is a type of fluid coupling used to absorb mechanical energy and usually consists of a turbine or propeller mounted in an enclosure filled with water.As the turbine or propeller turns, mechanical energy is transferred to the water due to turbulence and friction. The shock caused by the acceleration of the water as it passes from pockets in the stator to the pockets in the spinning rotor requires energy. That energy heats the water due to the friction as the water moves through the water brake. Almost all of the horsepower of the system turning the rotor (usually an internal combustion engine) is converted into a temperature change of the water. A very small amount of energy is taken by the bearings and seals within the unit. Therefore, water must constantly move through the device at a rate proportional to the horse power that is being absorbed. Water temperature exiting the unit must be kept under 120-160F (50-70 °C) to prevent scale formation and cavitation. The water enters in the center of the device and after passing through the pockets in the stator and rotor exits the outside of the housing though a controlled orifice. The amount of loading is dependent on the level of water inside the housing. Some water brakes vary the load by controlling the inlet water volume only and have a set outlet orifice size depending on the desired hp to be absorbed and some control both input and output orifices at the same time which allows greater control over outlet water temperatures. The housing is vented to the outside to allow air to displace the water as the water level in the unit rises and falls. The amount of torque that can be absorbed is defined by the equation T=kN2D5 where T = torque, N = RPM, D = the diameter of the rotor and k = a constant dependent on the size and shape and angle of the rotor/stator pockets.Systems which require the torque of the system under test to be measured typically use a strain gauge mounted on a torque arm that is attached to the housing perpendicular to the input shaft. The housing/stator is mounted on roller bearings and the rotor is mounted on roller bearings within the housing/stator so that it can turn independently of the rotor and frame. The strain gauge connects the torque arm to the frame assembly and keeps the housing from spinning as housing tries to turn in the same direction of the turbine. (Newton’s third law). The amount of resistance can be varied by changing the amount of water in the enclosure at any one time. This is accomplished though manual or electronically controlled water valves. The higher the water levels within the brake the greater the loading. Water brakes are commonly used on some forms of dynamometer.".
- Water_brake thumbnail Dyno_schematic.svg?width=300.
- Water_brake wikiPageID "11015903".
- Water_brake wikiPageRevisionID "554017851".
- Water_brake hasPhotoCollection Water_brake.
- Water_brake subject Category:Dynamometers.
- Water_brake type Artifact100021939.
- Water_brake type Device103183080.
- Water_brake type Dynamometer103260733.
- Water_brake type Dynamometers.
- Water_brake type Instrument103574816.
- Water_brake type Instrumentality103575240.
- Water_brake type MeasuringInstrument103733925.
- Water_brake type Object100002684.
- Water_brake type PhysicalEntity100001930.
- Water_brake type Whole100003553.
- Water_brake comment "A water brake is a type of fluid coupling used to absorb mechanical energy and usually consists of a turbine or propeller mounted in an enclosure filled with water.As the turbine or propeller turns, mechanical energy is transferred to the water due to turbulence and friction. The shock caused by the acceleration of the water as it passes from pockets in the stator to the pockets in the spinning rotor requires energy.".
- Water_brake label "Water brake".
- Water_brake sameAs m.0410z11.
- Water_brake sameAs Q7973454.
- Water_brake sameAs Q7973454.
- Water_brake sameAs Water_brake.
- Water_brake wasDerivedFrom Water_brake?oldid=554017851.
- Water_brake depiction Dyno_schematic.svg.
- Water_brake isPrimaryTopicOf Water_brake.
