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    How does a diesel generator work؟

    How does a diesel generator work؟

    How does a diesel generator work?


    In this memo, we intend to carefully describe and study how this device works in a process-oriented way, while categorizing the parts of a diesel generator.

    Obviously, all our efforts in this memo will be devoted to examining the main parts and components, but this does not mean that other minor parts are ineffective or not practical. Due to this issue, we will examine the performance of the diesel generator without wasting time. The list of topics you will read in this note is as follows:


    What is a diesel generator?

    What is the difference between diesel generators in terms of performance?

    General schematic of diesel generator operation.

    The difference is in the diesel engine.

    Different stages of diesel engine performance cycle.


    What is a diesel generator?


    This question may seem a bit obvious, but in fact, to avoid any inconsistencies in the text and explanations, it is not bad to answer it. A diesel or diesel generator is a generator that, unlike a gasoline generator, uses a diesel motor.


    As you probably know, a diesel engine uses diesel fuel, and this use of a different fuel has made its performance different from that of a gasoline engine and a gasoline generator.

    What is the difference between diesel generators in terms of performance?

    Users and buyers always ask sellers the question, what is the difference between a diesel generator and a gasoline generator in terms of performance and what are its advantages compared to it? In response, it should be said that:

    Gasoline generators and diesel generators are no different in the electrical circuit and other electrical parts, and their differences are limited to the drive motor.

    The diesel generator is far more efficient and cost-effective than the gasoline generator in terms of fuel consumption and engine efficiency.

    Apart from the fact that diesel fuel is cheaper, always in equal engine volume and equal fuel consumption, it is the diesel engine that produces more power.

    The diesel engine produces more noise than the gasoline engine. Although this is absolute and permanent, but in most models, we see more noise and noise pollution in the diesel engine.

    In terms of exhaust emissions, the gasoline generator is in a better condition. Usually, diesel generators receive lower quality scores in the exhaust gases section and are more polluting in practice.


    Now, considering these major differences in the performance of diesel generators and gasoline generators, let us move on to the main question of the text. How does a diesel generator work?


    General schematic of diesel generator operation

    In general, in all generators, fuel will first enter the static fuel (or electric fuel injection) into the engine cylinders. This fuel will then be converted into propulsion in a process that will be described in detail later, and the engine will have an output rotational force.

    Now, with the entry of this rotational force from the motor to the generator, electricity will be generated. The operation of the generator is quite the opposite of generators; The motion is entered through a shaft and after rotation, it will be converted into electricity.

    Eventually, this generator generated electricity will enter the electrical circuits of the diesel engine.

    This power must be regulated during the circuit and after normalizing the current and voltage of the output and stabilizing the frequency, it must be converted into output power according to the user's wishes.

    This is a general schematic of the performance of all types of generators, from diesel generators. But what exactly is the difference between a diesel generator and a gasoline generator?

    The difference is in the diesel engine.

    In a diesel engine, unlike a gasoline engine, we do not see the use of a piece called a spark plug.

    As you know, the function of the spark plug is to ignite the cylinder and ignite the air-fuel mixture, but in a diesel engine with a diesel engine, we do not see the use of spark plugs, and there is the question of how the mixture will ignite without a spark.

    Note that the chemical nature of diesel is different from that of gasoline. Diesel engines heat a mixture of diesel and air to a high density without sparks, which will ignite without the need for sparks!

    An accurate explanation of this issue from a thermodynamic point of view is time consuming, but in a word, it should be said that the condensation of diesel and air with a very high compression ratio, heats the whole fuel-air mixture to some extent, which will be possible without the need for a spark plug.

    So the main difference between diesel and gasoline engines is due to the same difference in the type of ignition of the fuel-air mixture.


    However, in a gasoline engine, even after compression, the mixture will not ignite without spark plugs. Now that you know the difference between diesel and gasoline engines, you also learned how a diesel generator with a diesel engine works.

    In order to complete this topic in a four-part process, we will describe the combustion cycle in a diesel generator.

    Different stages of diesel engine performance cycle

    1) Suction: At this stage, the mixture of diesel and air will enter the engine through the inlet valve. The ratio of this mixture will be determined by the carburetor or (EFI). The force required to suck the diesel-air mixture will be provided by moving the piston down.

    2) Compression stage: In this stage, all inlet and outlet valves are closed. The piston moves to the top of the cylinder again and this compression will continue until the end (the point of death of the piston). Eventually the compression of the piston will stop.

    3) Explosion phase: The compaction phase will continue until the increase in pressure, which coincides with the increase in temperature of the mixture, will cause a flame and in other words, the combustion of diesel and air mixture.

    During this ignition and the release of energy because all the valves are closed, an increase in the volume of gas inside the cylinder pushes the piston down. This descent of the piston continues until it reaches the lower point of death and stops.

    4) Evacuation stage: In this stage, the smoke valves (outlet) are opened. The piston then moves upwards again, evacuating smoke and other ignition gases in such a way that the cylinder and piston assembly are ready to start this cycle from the beginning.


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