The objective of utilizing a dynamometer is to test the
burden convenience of a train locomotive prior to putting it in service. It allows for that break-in of the
new or newly rebuilt engine in 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 last longer, run better and price less to keep. This short article highlights the
whole process of the
lake brake engine dynamometer.
A train locomotive with no load can only produce speed. Maintaining confirmed rate of revolutions for each minute (RPM) takes a very small amount of engine horsepower. The dyno can be a strategies that any controlled load could be added and monitored. Having a water brake dynamometer, the
horsepower of the
prime mover is converted 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 to the engine dyno or chassis dyno by passages within the stator, it is discharged to the dyno near the center of rotation with the rotor assembly. This water entering the dyno will flow into the pockets of the rotor. Water will be accelerated by the rotation with the rotor assembly, which can be connected to the output shaft from the engine. Because it increases (or accelerates), the lake will fly out due to centrifugal force. And because the water flies out, it leads to pockets in the stator plates. The lake over these similar pockets in the stator plates tends to go out and is yet again met through the rotating podriamos [Read the Full Write-up
] rotor assembly. Water is increased (or accelerated) again, and with the constant acceleration and deceleration from the water, power is needed which can be transformed into frictional heating with the water. The thermal conversion of engine capacity to frictional heating from the water is sustained by pure laws of physics.
Horsepower may be defined with regards to heat. Heat loads are measured with regards to "BTUs" or British Thermal Units. A BTU of warmth is the amount of heat which it would decide to try raise 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.
Because we're raising the temperature of just one pound water by one degree Fahrenheit, we will need to know some more definitions. You will find 62.4 pounds of pure water inside a cubic foot. You will find 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 per hour or about 45.5 BTUs each minute. With this information, we can now determine the amount of water that is necessary to absorb confirmed level of horsepower. The quantity of water inside the dyno at any given instant determines how much horsepower that it could absorb. The harder water which is inside the dynamometer, the more the dyno can absorb. You cannot put more water in to the dyno compared to the amount for your degree of horsepower which you intend to test.
The dynamometer doesn't hold water. It is simply an instrument for converting the horsepower into heat from the water. Due to this, you will need a given flow through the dyno with a given horsepower rating. How much flow varies with the amount of horsepower to become absorbed and is directly proportional. The larger the level of load required, the larger the amount of water will have to be supplied.
The quantity of water supplied towards the dynamometer is controlled externally towards the dynamometer. This can be done either with a couple of manual turn off valves mounted in the water supply line, through the electric remote load control valve or through the servo-operated inlet
manifold option. Whether or not the manual or electric valves are used, both accomplish the same task. The broader the valve is opened, the harder water it allows to circulate to the dynamometer. This flow towards the dyno is directly proportional towards the amount of horsepower being absorbed.
or outlet valve can also be attached to the dynamometer. The objective of this valve is to conserve water while allowing the dynamometer to perform on various temperatures of inlet water. As we are converting horsepower into heat with the water, the partnership from the inlet and outlet water temperatures becomes an essential consideration. The exhaust valve is a controlled orifice. The farther it's opened, the larger the water consumption is going to be.
- 2014/02/18(火) 14:34:32|
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