The development of thermal engines is in constant development. This website too.
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The 2-stroke engine (or cycle engine) is a type of internal combustion engine that performs the operating cycle in two piston strokes. Active fluid intake must occur during a fraction of the compression stroke, and exhaust must occur during a fraction of the working stroke.
The 2-stroke cycle was conceived to simplify the distribution system, eliminating and reducing the number of valves, and to obtain greater power at the same engine dimensions.
Both the Otto cycle and the diesel cycle can work with two-stroke engines.
Two-stroke gasoline engines are commonly used in engines with small horsepower: motorcycles, lawn mowers, model airplane engines, etc. On the other hand,…
Last review: November 25, 2021
A four-stroke engine is an internal combustion engine that performs four piston strokes in each cycle while the crankshaft performs two full revolutions.
This type of engine can work both in the diesel cycle and in the Otto cycle (gasoline engine).
These four times are: intake, compression, combustion or explosion, and exhaust. We explain them in more detail below:Admission of the load in the cylinder
The piston goes…
Last review: November 24, 2021
The diesel engine is an alternative internal combustion engine that was purported to be an alternative to steam engines. The main difference with a gasoline engine is that it generates the ignition of the fuel due to the high temperatures derived from the high pressure to which the fuel is subjected.
However, before reaching the diesel engine, numerous thermal engine prototypes were designed.
At the beginning of the 19th century, the brothers Claude and Nicéphore Niépce developed the first known internal combustion engine and the first direct fuel injection system. In 1816 they experimented with alcohol and white petroleum oil (similar to kerosene). They discovered…
Last review: November 22, 2021
Vapor is a substance in the gas phase that is at a temperature lower than the critical point. Due to this characteristic, vapor can condense into a liquid or a solid by increasing its pressure without reducing the temperature.
That is, it is a gas that can be condensed at a constant temperature by increasing the pressure. On the other hand, to convert a non-vaporous gas to a liquid, it is not enough to increase the pressure, but the temperature will have to be decreased.
For example, water has a critical temperature of 374 ° C (647 kelvin), which is the highest temperature at which liquid water can exist.
Vapor can coexist with a liquid or solid. In this case, the…
Last review: November 21, 2021
The stator is the fixed part of an electrical machine that. Together with the rotor, it is a fundamental element to transmit electric current (in the case of electric generators) or power in the case of electric motors.
By electric machine we mean both electric motors and electric generators. The moving part of an electric motor is called a rotor. In the case of generators, the stator is the fixed part of the alternator that converts the mechanical energy of the rotor into electrical energy.
In alternating current machines, the stator is generally in the shape of a cylindrical tube with a certain wall thickness. The grooves where the stator coils are housed are made of stacked…
Last review: November 15, 2021
The rotor is the component that rotates in an electrical machine. The same definition is valid whether the electric machine is an electric motor or an electric generator.
In an electric motor, the rotor works together with the stator (fixed part) to transmit the power of the electric machine.
In addition to being a component of an electric motor, the term is commonly used in rotating machines, such as turbines and centrifugal pumps, as opposed to the so-called statorHow is the rotor of an electrical machine formed?
The rotor is composed of a shaft formed by a shaft that supports a set of coils wound on a magnetic core.
This shaft rotates within a magnetic…
Last review: November 12, 2021
A spark plug is an electrical device located in the cylinder head of some internal combustion engines. The function of the spark plug is to ignite the compressed fuel-air mixture by means of an arc of electrical current that generates a spark.
Basically they are electrical conductors that receive a difference in electrical potential from the ignition coil to introduce it into the engine cylinder.
In addition to starting fuel combustion, they also double as a heat sink.
Spark plugs have an insulated center electrode that is connected by a tightly insulated wire to an external ignition coil circuit, forming, with a grounded terminal at the base of the plug, a spark gap…
Last review: November 11, 2021
An asynchronous motor is an electric motor powered by alternating current in which the speed of rotation of the rotor is different from that of the magnetic field of the stator. This type of motor is also known as an induction motor.
The induction motor is composed of a rotor and a stator, in which the inductor coils are located. The inductor coils are three-phase and are 120º out of phase with each other.
The asynchronous motor is based on the currents induced in the rotor from the stator's magnetic field; that's why it's called an induction machine.
In order to induce an electric current in the rotor, it is necessary for the rotor to be subjected to a variation…
Last review: October 1, 2021
Direct current electric motors work thanks to the properties of permanent magnets and the magnetic field that is generated when an electric current is circulated through a conductor.
The operation of electric motors is based on an alternating magnetic field. In a direct current motor, therefore, the direction of the magnetic field constantly changes mechanically in the motor with the help of the commutator (collector), or electronically in the case of the so-called brushless electric motor.
The main characteristic of magnets is that they have a south pole (negative) and a north pole (positive). In two different magnets the poles of different signs attract and the poles of the…
Last review: September 27, 2021
The displacement of a heat engine indicates the amount of gas (a mixture of air and fuel) that can be burned in the cylinders.
In reality, the displacement does not reflect the contents of the cylinders, but only the volume of the part that is displaced by the pistons. Above the highest position of the cylinder, a small volume of the combustion chamber remains that is not included. Below the lower position of the piston is a part of the cylinder that serves to guide the piston and that is also not included when calculating the displacement.
A unit displacement heat engine is an engine that has a single cylinder, such as chainsaw engines. At the same time, they can have multiple…
Last review: September 21, 2021
The Atkinson cycle engine is a type of reciprocating internal combustion engine invented by James Atkinson in 1882. It is practically a common Otto cycle engine, but with a modified crankshaft crank for greater efficiency at the expense of a reduction in horsepower. .
The goal of the Atkinson cycle was to compete with the Otto cycle without infringing any patents. The Atkinson engine has better efficiency but is less powerful than the Otto engine.
In its original version, the Atkinson cycle requires a single rotation of the crankshaft to complete an operating cycle, keeping the phases of the Otto cycle engine unchanged: intake, compression, expansion (useful phase) and discharge.…
Last review: September 19, 2021