Tag Archive : diesel engine

What is Diesel Engine? | Diesel Engine working

A diesel engine is any type of internal combustion engine in which the air is compressed to a temperature such that the diesel fuel injected into the cylinder burns, expands, and to moves the piston. It converts the chemical energy stored in the fuel into mechanical energy which can be used to power trucks, large tractors, locomotives, and ships. A limited number of cars, like some generators, run on diesel.

The four-stroke diesel engine completes a power cycle after two revolutions of the crankshaft.  While a two-stroke diesel engine completes a power cycle after one revolution of the crankshaft.

Diesel Cycle

The diesel engine works on a diesel cycle. This cycle works two or four times. However, unlike spark-ignition petrol engines, diesel engines only enter the combustion chamber while drinking. The compression ratio of diesel engines is typically between 14: 1 and 22:1. In engines with bores (cylinder diameter) of less than 600 mm (24 inches), the design of two- and four-stroke engines is found. Engines with a diameter greater than 600 mm are almost all two-stroke systems.

Diesel engines are powered by burning fuel that has been injected or injected into a cylinder by loading hot compressed air. The air must be heated to a temperature above which the injected fuel can be burned. The temperature of the fuel injected into the air is higher than the “self-ignition” temperature of the fuel, which automatically converts oxygen to air and burns it. The air temperature is generally above 526 ° C (979 ° F). However, when the engine is started, additional cylinder heating is used as the air temperature in the cylinder is determined by the ratio of engine compression to workflow.

Diesel engine is also called compression ignition engine because the ignition of combustion depends on compressed hot air rather than electric sparks.

In a diesel engine, fuel enters when the piston approaches the dead center of travel. The high-pressure fuel enters the pre-combustion chamber or directly into the combustion chamber of the piston cylinder. Diesel engines use direct injection in addition to small high-speed systems.

How does a diesel engine work?

Today, fuel prices are rising due to increased demand and declining supply. You have to choose profitable fuels to meet your needs. Thanks to the invention of Rudolf Diesel, diesel engines are very efficient and profitable. The price of diesel fuel is slightly higher than that of gasoline, but diesel has a higher energy density, which means that more energy can be extracted from diesel than the same amount of gasoline. As a result, diesel engines in cars offer higher mileage, making it a clear choice for transportation and heavy equipment. Compared to gasoline, diesel is heavier, oily and has a higher boiling point than water. Diesel engines are gaining more attention due to increased efficiency and profitability.

The difference depends on the type of combustion. Gasoline engines use positive combustion for performance, while diesel engines use compression by compression for fuel combustion. Finally, air is drawn into the device and subjected to a lot of pressure to heat the device. This is due to the very high engine temperature, which is higher than the temperature obtained in a gasoline engine. At higher temperatures and pressures, diesel fuel entering the engine ignites due to extreme temperatures.

In the diesel engine, air and fuel are injected into the engine in various stages, while gas engines inject a mixture of air and gas. The injection is used to inject fuel into diesel engines, while gasoline engines use a carburetor for this purpose. In a gasoline engine, fuel and air are drawn in along with the engine and then compressed. The air-fuel mixture limits fuel compression and limits overall efficiency.

Diesel engines only compress the air and the compression ratio can be higher. The compression ratio of diesel engines is between 14: 1 and 25: 1, while the compression ratio of gasoline engines is between 8: 1 and 12: 1. After combustion, the by-products of combustion are discharged from the engine from the exhaust gases.

To start in the colder months, the extra heat is provided by a “lit candle”. The diesel engine can be two- or four-stroke and is selected according to the mode of operation. Air and liquid cooling engines are some of the things you can choose from. It is good to use a liquid cooling generator because it works quietly and has constant temperature control.

Advantages of diesel engines

Diesel engines are more efficient than petrol engines for the following reasons.

  1. Modern diesel engines have overcome the shortcomings of older models with more noise and maintenance costs. Compared to gas engines of the same size, they are now quieter and require less maintenance.
  2. They are more stable and reliable
  3. It does not ignite spontaneously when it burns. Without candles or candles, maintenance costs are reduced
  4. The cost of fuel per kilowatt produced is 30-50 less than a gas engine.
  5. An 1,800-rpm diesel cooling unit runs for 12,000 to 30,000 hours before needing maintenance. Installing gas at 1800 rpm typically takes 6,000 to 10,000 hours to require maintenance.
  6. Gas units burn hotter than diesel units, so they have a shorter lifespan than diesel units.

Applications of diesel engine

Diesel engines are commonly used as motor engines, generators, and mobile drives. They are widely used in locomotives, construction equipment, automobiles, and numerous industrial applications. Their fields are widespread in almost all sectors, and if you want to understand everything that happens, you can see them every day.

Industrial diesel engines and diesel generators are used in construction, transportation, mining, hospitals, forestry, telecommunications, underground, and agriculture. Primary or backup power generation is the main application of diesel generators today.