The goal of using a dynamometer is to test the burden capability of a train locomotive ahead of putting it in service. It allows for your break-in of the new or newly rebuilt engine in the controllable environment. Engine manufacturers, rebuilders and many fleets have proven this kind of break-in procedure through many years of experience. Properly run-in engines go longer, run better and cost less to keep. This article highlights the whole process of water brake engine dynamometer.
An electric train engine without a load can only produce speed. Maintaining a given rate of revolutions each minute (RPM) needs a really small quantity of engine horsepower. The dyno is really a strategies by that your controlled load may be added and monitored. With a water brake dynamometer, the horsepower with the prime mover is changed into heat with the dynamometer water. The stators and rotors successfully achieve
this transfer of energy. The stators and rotors have pockets built within them. As water is brought in to the engine dyno or chassis dyno by passages in the stator, it is discharged in to the dyno near the center of rotation of the rotor assembly. This water entering the dyno will flow to the pockets from the rotor. The lake is then accelerated from the rotation with the rotor assembly, which is attached to the output shaft
from the engine. As it speeds up (or accelerates), the lake will fly out due to centrifugal force. And because the water flies out, it results in pockets Pocketpussytoy.Com
within the stator plates. The water over these similar pockets inside the stator plates has a tendency to run out and is also yet again met by the rotating rotor assembly. The water is increased (or accelerated) again, and with the constant acceleration and deceleration of the water, power is needed which can be converted into frictional heating of the water. The thermal conversion of engine capacity to frictional heating
from the water is based on pure laws of physics.
Horsepower may be defined when it comes to heat. Heat loads are measured in terms of "BTUs" or British Thermal Units. A BTU of warmth may be the amount of heat it would decide to use improve the temperature of 1 pound of pure water by one degree Fahrenheit. When dealing with water brake dynamometers, the warmth loads when it comes to BTUs are very important.
Because we have been raising the temperature of 1 pound of water by one degree Fahrenheit, we'll have to know a few more definitions. There are 62.4 pounds of pure water inside a cubic foot. You can find 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 per hour or about 45.5 BTUs each minute. With this particular information, we can now determine the amount of water that's necessary to absorb confirmed amount of horsepower. The amount of water in the dyno at any given instant determines the amount of horsepower that it can absorb. The greater water which is inside the dynamometer, the greater the dyno can absorb. You cannot put more water into the dyno compared to amount for your level of horsepower that you intend to test.
The dynamometer will not hold water. It is only an instrument for converting the horsepower into heat with the water. For this reason, you need a given flow from the dyno at a given horsepower rating. The amount of flow varies with the amount of horsepower to be absorbed and it is directly proportional. The larger the quantity of load required, the greater the amount of water will need to be supplied.
The quantity of water supplied for the dynamometer is controlled externally to the dynamometer. This can be done either by way of a set of manual shut down valves mounted within the water supply line, through the electric remote load control valve or by the servo-operated inlet manifold option. If the manual or electric valves are employed, both of them accomplish exactly the same task. The wider the valve is opened, the harder water it enables to circulate for the dynamometer. This flow towards the dyno is directly proportional
towards the level of horsepower being absorbed.
An exhaust or outlet valve can be installed on the dynamometer. The goal of this valve would be to conserve water while allowing the dynamometer to perform on various temperatures of inlet water. Even as are converting horsepower into heat from the water, the connection with the inlet and outlet water temperatures becomes a crucial consideration. The exhaust valve is a controlled orifice. The farther it's opened, the larger the water consumption will probably be.
- 2014/02/15(土) 05:48:53|
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