The objective of using a dynamometer would be to test the strain capability of an electric train engine ahead of putting it back in service. It enables for your break-in of the new or newly rebuilt engine inside a controllable environment. Engine manufacturers, rebuilders and several fleets have proven this sort of break-in procedure through numerous years of experience. Properly run-in engines go longer, run better and cost less to keep. This short article highlights the process of water brake engine dynamometer.
An electric train engine with out a load are only able to produce speed. Maintaining confirmed rate of revolutions per minute (RPM) needs a really small level of engine horsepower. The dyno is a strategies by which a controlled load may be added and monitored. Having a water brake dynamometer, the horsepower from the prime mover is converted into heat with the dynamometer water. The stators and rotors successfully achieve this change in energy. Both stators and rotors have pockets built within them. As water is brought into the engine dyno or chassis dyno by passages within the stator, it really is discharged in to the dyno close to the center of rotation of the rotor assembly. This water entering the dyno will flow into the pockets from the rotor. Water will then be accelerated from the rotation with the rotor assembly, which can be attached to the output shaft with the engine. Since it accelerates (or accelerates), the lake tends to fly out due to centrifugal force. And as the water flies out, it ends up in pockets in the stator plates. The lake over these similar pockets inside the stator plates tends to go out and is also once more met from the rotating rotor assembly. The lake is increased (or accelerated) again, and with the constant acceleration and deceleration
with the water, power is necessary which can be transformed into frictional heating with the water. The thermal conversion of engine power to frictional heating from the water is sustained by pure laws of physics.
Horsepower may be defined in terms of heat. Heat loads are measured with regards to "BTUs" or British Thermal Units. A BTU of heat will be the amount of heat that it would take to raise the temperature of just one pound of pure water by one degree Fahrenheit. While confronting water brake dynamometers, the heat loads when it comes to BTUs are very important.
Because we have been raising the temperature of one pound water by one degree Fahrenheit, we will need to know a few more definitions. You will find 62.4 pounds of pure water inside a cubic foot. There are 231 cubic inches in a single gallon
of pure water. Therefore, one gallon of pure water would weigh 8-⅓ pounds. One horsepower is the same as 2,545 BTUs hourly or about 45.5 BTUs each minute. With this information, we can now determine how much water that is essential to absorb a given level of horsepower. The amount of water within the dyno at any instant determines the quantity of horsepower that it can absorb. The more water that's inside the dynamometer, the harder the dyno can absorb. You can not put more water in to the dyno than the amount for that degree of horsepower which you intend to test.
The dynamometer doesn't hold water. It is only something for converting the horsepower into heat of the water. For this reason, you will need a given flow through the dyno in a given horsepower rating. The amount of flow varies because there are many horsepower being absorbed and is also directly proportional. The better the amount of load required, the larger the level of water must be supplied.
How much water supplied towards the dynamometer is controlled externally for the dynamometer. This can be accomplished either by a pair of manual turn off valves mounted within the water supply line, by the electric remote load control valve or from the servo-operated inlet manifold option. Whether or not the manual or electric valves are used, both accomplish the identical task. The wider the valve is opened, the harder water it allows circulation to the dynamometer. This flow for the dyno is directly proportional towards the quantity of horsepower being absorbed.
An exhaust or outlet valve can also be attached to the dynamometer. The goal of this valve is always to conserve water while allowing the dynamometer to perform on various temperatures of pocketpussytoy.com
inlet water. As we are converting horsepower into heat from the water, the relationship with the inlet and outlet water temperatures becomes an important consideration. The exhaust valve is really a controlled orifice. The farther it really is opened, the greater the water consumption will be.
- 2014/02/08(土) 23:06:02|
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