- 期刊
Determination of Optimal Angular Velocity of Rotating Cam of Diesel Generator
摘要
A diesel generator set uses a diesel engine as a prime mover and is a power supply device for generating power by means of a synchronous generator. It is a power generating device with fast start, convenient operation and maintenance, low investment, and strong adaptability to the environment. The fuel enters the high-pressure fuel pipe through the high-pressure oil pump, and then is ejected from the nozzle. During this process, if no control is applied, the pressure in the high-pressure tubing will change, which will change the fuel injection rate and affect the working efficiency of the generator. Using the continuity theorem and Bernoulli equation, the work of the injector is divided into four stages, the transition process from the needle valve conduction to the injection hole starts to inject fuel, the process of stable oil injection through the injection hole, the transition process from the needle valve closing to the nozzle orifice with zero flow rate, the process of nozzle flow is zero, we analyzed the influence of the needle valve movement on the injection rate of each process in detail. Then the movement of the high-pressure plunger is divided into two processes. The first process is that the plunger only compresses but the one-way valve does not conduct; the second process is that the one-way valve conducts from the beginning to the end of a cycle. We set out the differential equation of the oil injection rate and time, and use the finite element difference method to obtain the relationship between the oil injection rate and time of the one-way valve when the cam rotates at different angular velocities, and draw a curve. Through the analysis of oil inlet rate curves at different angular velocities and the comparison of oil inlet and outlet rate curves, it is concluded that when the cam rotates at an angular velocity of 0.08rad/ms, the mass of oil in and out of the high-pressure tubing is basically the same, and the pressure in the high-pressure tubing is more stable.