Simulation research on transient characteristics of diesel engine based on compressed air starting
A steady-state model of a high-power marine diesel engine was established based on the one-dimensional simulation software GT-Power.On this basis,the system was improved by adding modules for high-pressure gas cylinders,pipelines,air distributors,and starting air valves.A transient model of the diesel engine starting process based on com-pressed air distributor starting was constructed,and the accuracy of the two models was verified through experiments.A sys-tematic analysis was conducted on the effects of environmental pressure,lubricating oil temperature,and starting system parameters on the starting process performance of diesel engines.The results showed that the compressed air system can drive the diesel engine to start for 2.6 s and can achieve six consecutive starts,meeting the starting performance require-ments of diesel engines;The increase in environmental pressure increases the starting exhaust resistance,significantly in-creases the starting time,and reduces the number of consecutive starts.Choosing a compressed air pressure of 30 bar,a cylin-der volume of 350 L,an air pipeline diameter of 36 mm,and a supply starting angle of-5° CA can effectively improve the starting performance of diesel engines.From the simulation results of sudden loading and unloading at 100％load,it can be seen that the transient speed regulation rate of the diesel engine reaches 4.67％,which does not exceed the indicator require-ment of 5％.The recovery time for the speed to recover to±2％of the rated speed is increased to 0.57 s,meeting the indicat-or requirements.
compressed air startingdiesel enginetransientspeed regulation characteristicGT-Power
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