The goal of utilizing a dynamometer
is always to test the burden capacity for a train locomotive just before putting it back in service. It allows for that break-in of a new or newly rebuilt engine inside a controllable environment. Engine manufacturers, rebuilders and lots of fleets have proven this sort of break-in procedure through many years of experience. Properly run-in engines last longer, run better and value less to keep. This informative article highlights the whole process of the lake brake engine dynamometer.
An electric train engine without a load is only able to produce speed. Maintaining confirmed rate of revolutions each minute (RPM) takes a really small quantity of engine horsepower. The dyno is a strategies by which a controlled load could be added and monitored. Having a water brake dynamometer, the horsepower from the prime mover is changed into heat of the dynamometer water. The stators and rotors successfully accomplish this transfer of energy. Both the 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 to the dyno close to the center of rotation with the rotor assembly. This water entering the dyno will flow to the pockets from the rotor. The water will then be accelerated by the rotation with the rotor assembly, which can be attached to the output shaft of the engine. As it speeds up (or accelerates), water will fly out as a result of centrifugal force. And as the water flies out, it leads to pockets in the stator plates. The lake during these similar pockets within the stator plates has a tendency to come to an end and it is once more met through the rotating rotor assembly. The water is increased (or accelerated) again, and also the constant acceleration and deceleration with the water, power is required which can be changed into frictional heating from the water. The thermal conversion of engine power to frictional heating from the water is ours (Related Site
) sustained by pure laws of physics.
Horsepower can be defined when it comes to heat. Heat loads are measured with regards to "BTUs" or British Thermal Units. A BTU of warmth will be the level of heat that it would take to raise the temperature of 1 pound of pure water by one degree Fahrenheit. When dealing with water brake dynamometers, the heat loads in terms of BTUs are very important.
Because we have been raising the temperature of one pound water by one degree Fahrenheit, we are going to have to know other definitions. You will find 62.4 pounds of pure water inside a cubic foot. There are 231 cubic inches in one gallon of pure water. Therefore, one gallon of pure water would weigh 8-⅓ pounds. One horsepower is equal to 2,545 BTUs per hour or about 45.5 BTUs per minute. Using this information, we could now determine how much water which is necessary to absorb confirmed level of horsepower. The quantity of water inside the dyno at a instant determines how much horsepower that it may absorb. The harder water which is inside the dynamometer, the greater the dyno can absorb. You can't put more water to the dyno compared to the amount for the level of horsepower which you plan to test.
The dynamometer doesn't hold water. It is simply something for converting the horsepower
into heat of the water. Due to this, you need a given flow through the dyno with a given horsepower rating. The quantity of flow varies because there are many horsepower being absorbed and is directly proportional. The better the amount of load required, the larger the level of water will have to be supplied.
How much water supplied for the dynamometer is controlled externally for the dynamometer. This can be accomplished either by a couple of manual shut down valves mounted in the water supply line, through the electric remote load control valve or from the servo-operated inlet manifold option. Whether the manual or electric valves are used, they both accomplish the same task. The wider the valve is opened, the harder water it allows to circulate for the dynamometer. This flow to the dyno is directly proportional to the level of horsepower being absorbed.
An exhaust or outlet valve is also mounted on the dynamometer. The purpose of this valve is to conserve water while allowing the dynamometer to perform on various temperatures of inlet water. Once we are converting horsepower into heat from the water, the partnership from 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 larger the water consumption will probably be.
- 2014/02/27(木) 04:15:36|
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