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The concept and classification of diesel engine power

Diesel engine power is the amount of work that the dieselengine will do per unit of time.

Extreme power the maximum power a diesel engine can produce is called extreme power, which is limited by many factors. The ultimate power of non - supercharged diesel engines is limited by average effective pressure and speed. The increase of mean effective pressure means that the excessive air coefficient is decreased. When the acidity decreases to a certain value, incomplete combustion such as exhaust smoke and smoke will occur. Increasing the speed can also increase the power of diesel engine, but too high speed will increase the inertial load of moving parts and aggravate the wear. The ultimate power of the enhanced diesel and exhaust turbocharged diesel engines is also limited by factors such as maximum combustion pressure Pmax, exhaust turbine front temperature Tr and supercharger speed nT. Therefore, the power of a diesel engine should be calibrated according to the characteristics, USES, life and reliability of the diesel engine.

Calibration power: according to the national standard, the calibration power of internal combustion engine is divided into four types according to its use and usage characteristics.

The 15min power internal combustion engine allows continuous running of the maximum effective power of I5min. Suitable for internal combustion engine power calibration of automobiles, ships, tanks, etc.

1h power the maximum effective power of an internal combustion engine allowed to run continuously for 1h. It is suitable for the calibration of internal combustion engine power for industrial tractors, engineering machinery, diesel engines, ships, etc.

The 12h power internal combustion engine allows continuous operation of the maximum effective power for 12h. It is suitable for calibration of internal combustion engine power for agricultural tractor, agricultural drainage and irrigation, internal combustion engine car, inland river ship, etc.

Continuous power the maximum effective power that an internal combustion engine can operate continuously for a long period of time. Suitable for calibration of internal combustion engine power for agricultural drainage and irrigation, ocean-going ships and power stations.

Diesel engine power calibrated according to Chinese national standard is called calibration power. However, the relationship between the calibrated power and the ultimate power is not specified in the standard. Therefore, the calibrated power can only be reasonably determined through the production practice.

When the power correction diesel engine runs, the external atmospheric pressure, atmospheric temperature and relative humidity have a great influence on the diesel engine's air charge. The change of atmospheric state leads to the change of diesel engine's air charge, which affects the performance of diesel engine. As a result, the power of diesel engine calibration and other performance measure must have a benchmark, to China's regulations on the national standard, power measurement calibration standard atmospheric conditions is: (1) stationary diesel engine: the atmospheric pressure of 101.3 kPa, environment temperature 25 ℃, relative humidity 60%; (3) Marine diesel engine, the atmospheric pressure of 101.3 kPa, ambient temperature 35 ℃, relative humidity 60%.

Because of the difference of regional climate and geographical conditions, it is very difficult to require all diesel engine manufacturers to simulate the standard atmospheric conditions for diesel engine testing. Therefore, it is necessary to convert the power measured under test atmosphere conditions to the power emitted by diesel engine under standard atmosphere conditions, which is the power correction of diesel engine. Diesel engine using area, on the other hand, the difference between atmospheric conditions and standard atmospheric conditions, that cannot be used in accordance with the brand of the power of diesel engine, and must be used in a region of atmospheric conditions for power as normal use diesel engine power. Therefore, it is necessary to convert the power under standard atmospheric conditions to the power corresponding to the ground atmospheric conditions.