The objective of using a dynamometer is to test the strain capacity for an engine ahead of putting it in service. It enables for that break-in of a new or newly rebuilt engine inside a controllable environment. Engine manufacturers, rebuilders and several fleets have proven this kind of break-in procedure through many years of experience. Properly run-in engines last longer, run better and value less to keep up. This short article highlights the operation of the water brake engine dynamometer.
An electric train engine with no load is only able to produce speed. Maintaining a given rate of revolutions each minute (RPM) needs a tiny amount of engine horsepower. The dyno is a strategies that any controlled load can be added and monitored. Using a water brake dynamometer, the horsepower with the prime mover is transformed into heat with the dynamometer water. The stators and rotors successfully achieve this transfer of energy. Both the stators and rotors have pockets built within them. As water is brought to the engine dyno or chassis dyno by passages inside the stator, it is discharged to the dyno near the center of rotation with the rotor assembly. This water entering the dyno will flow to the pockets of the rotor. The lake is then accelerated through the rotation of the rotor assembly, that is attached to the output shaft with the engine. Because it accelerates (or accelerates), the lake has a tendency to fly out as a result of centrifugal force. And as the water flies out, it ends up in pockets in the stator plates. The water over these similar pockets within the stator plates will come to an end and is also once again met from the rotating rotor assembly. The lake is sped up (or accelerated) again, along with the constant acceleration and deceleration from the water, power is needed that is 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 can be defined when it comes to heat. Heat loads are measured in terms of "BTUs" or British Thermal Units. A BTU of heat may be the quantity of heat that it would take to enhance the temperature of 1 pound of pure water by one degree Fahrenheit. When dealing with water brake dynamometers, heat loads when it comes to BTUs are very important.
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- Because we're raising the temperature of one pound of water by one degree Fahrenheit, we'll need to know other definitions. You will find 62.4 pounds of pure water in a cubic foot. There are 231 cubic inches in a gallon of pure water. Therefore, one gallon of pure water would weigh 8-⅓ pounds. One horsepower is equal to 2,545 BTUs hourly or about 45.5 BTUs for each minute. With this particular information, we could now determine the amount of water which is required to absorb certain amount of horsepower. How much water within the dyno at any given instant determines how much horsepower
that it can absorb. The harder water
that is inside the dynamometer, the more the dyno can absorb. You can not put more water in to the dyno than the amount for your level of horsepower which you intend to test.
The dynamometer does not hold water. It is just something for converting the horsepower into heat from the water. Due to this, you need a given flow from the dyno in a given horsepower rating. How much flow varies considering the variety of horsepower to become absorbed and is directly proportional. The larger the quantity of load required, the better the amount of water will need to be supplied.
How much water supplied towards the dynamometer is controlled externally towards the dynamometer. This can be done either with a set of manual turn off valves mounted in the water supply line, through the electric remote load control valve or by the servo-operated inlet manifold option. Whether or not the manual or electric valves are used, both of them accomplish the identical task. The broader the valve is opened, the harder water it enables to circulate to the dynamometer. This flow for the dyno is directly proportional for the level of horsepower being absorbed.
An exhaust or outlet valve is also mounted on the dynamometer. The goal of this valve would be to conserve water while allowing the dynamometer to run on various temperatures of inlet water. Even as are converting horsepower into heat of the water, the relationship of the inlet and outlet water temperatures becomes an essential consideration. The exhaust valve is a controlled orifice. The farther it is opened, the larger the water consumption will probably be.
- 2014/02/23(日) 10:10:37|
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