Who ever made a turbojet engine?

Construction: air intake, air compressor, combustion chamber and turbine. The service life is only 25 hours, that is, some of the parts must be replaced after 25 hours of cumulative work.

That is, you can only fly in the sky for a maximum of 25 hours in a row. Turbojet engines are characterized by high altitude and high speed. The disadvantages are too oil-intensive, low oil efficiency ratio, short life, and frequent maintenance.

It also leads to a short range of aircraft. Turbofan engines are now used, and turbojet engines were only used in early jet aircraft. J-8 uses turbojet, J.

10. Su-27 and F22 use turbofans.

Before World War II, the combination of piston engine and propeller had achieved great success, giving mankind the ability to challenge the sky. But by the end of the thirties, the development of aviation technology brought this combination to the limit. When the propeller reaches a speed of 800 kilometers per hour, the tip of the propeller is actually close to the speed of sound, and the transonic speed and orange flow field make the efficiency of the propeller drop sharply, and the thrust does not increase but decreases.

The propeller has a large windward area and high drag, which greatly hinders the increase in flight speed. At the same time, as the flight altitude increases, the atmosphere becomes thinner, and the power of the piston engine decreases.

This led to a new jet engine propulsion system. The jet engine sucks in a large amount of air, which is ejected at high speed after combustion, creating a reaction force on the engine and propelling the aircraft forward.

Back in 1913, the French engineer Rennes"Lorrain proposed the design of the ramjet engine and patented it. But at that time, there were no corresponding means of boosting and corresponding materials, and jet propulsion was just a pipe dream. In 1930, the Englishman Frank Shed returned"Whittle was granted a patent for a gas turbine engine, the first jet engine design to be practical.

Eleven years later, he designed the first flight of the Bun Motor, which became the originator of the turbojet engine.

Compressor is an important component of turbojet engine, which transmits mechanical energy to gas and completes the gas working fluid compression process in the thermal cycle of the engine, so as to increase the gas pressure.

The increase in the pressure of the air entering the engine in the compressor is called the boost ratio, which is the ratio of the pressure of the compressor's outlet airflow to the pressure of its inlet airflow. Some engines are connected in series by one, two or three compressor units in sequence to form the engine's booster system, and the ratio of the pressure of the outlet airflow of the system to the pressure of the inlet airflow is called the total booster ratio of the engine.

Precautions for the use of jet engines.

Jet reaction is definitely an internal phenomenon. It is not as often assumed that jet engines are caused by the pressure of jet currents acting on the atmosphere. In fact, jet propulsion engines, whether rocket, ramjet, or turbojet, are designed to accelerate the flow of air or gas and expel it at high speed.

Of course, there are different ways to do this. However, in all examples, the final reaction force acting on the engine, i.e., thrust, is proportional to the mass of the airflow discharged by the engine as well as the speed of the airflow.

A jet engine is a reactionary engine that generates thrust through a jet. Most jet engines are internal combustion engines that work on Newton's third law. Jet engines in a broad sense include rocket engines and air jet engines.

The fuel and oxidizer of the rocket engine are carried by the aircraft, including the solid-fuel rocket engine and the liquid-fuel rocket engine code, which is characterized by being able to work in the atmosphere. Air jet engines, including ramjet engines, impulse engines, turbojet engines, and turbofan engines, draw air from the atmosphere as an oxidizer instead of carrying their own oxygen accompaniment. The most widely used air jet engine on modern air transport aircraft is the turbofan engine, which is characterized by high thrust, low noise, and low fuel consumption.

A jet engine is an engine that directly generates reaction thrust by the high-speed air flow from the nozzle. It is widely used as a power plant for aircraft. The fuel and oxidizer react chemically in the combustion chamber to release heat energy.

The heat energy is then transferred through the nozzle to the function of adjusting the airflow. In addition to fuel, the oxidizer carried by the aircraft is called a rocket engine, including a solid tung barrage fuel rocket engine and a liquid fuel rocket engine.

1. The principle of turbojet engine: when the turbojet engine is working, the engine first sucks air from the intake tract. This process is not simply to open an air intake, because the flight speed is varied, and the compressor has strict requirements for the air intake speed, so the air intake channel must be able to control the air intake speed of Yuanziqin in the appropriate range.

2. Turbojet engine, referred to as turbojet engine, is usually composed of an air intake, a compressor, a combustion chamber, a turbine and a tail nozzle. Some military engines also have afterburners between the turbine and tail nozzles.

3. The turbojet engine is a heat engine, and the principle of work is the same as that of orange bi: input energy under high pressure and release energy under low pressure. Canonization.

Turbojet is the basic type and is used in jet fighters.

For example, China's J-8 fighter uses turbojet engines.

The characteristics of this engine are suitable for high altitude and high speed, and the disadvantage is that at low altitude and low speed, the efficiency is not high, that is to say, it is more fuel-intensive, and the thrust is not large enough.

The turbofan is an enhanced type, adding an external duct on the basis of the turbojet, so that the wind blown out by the fan is blown out directly through the outer duct to increase the thrust, and through some technical means, the wind of the outer duct can be blown out of the front to form a reverse thrust, which is generally used for large aircraft such as passenger aircraft.

Now the new fighters also use turbofan engines, but they are improved turbofan engines with small bypass ratios, such as F22 and China's J-20 and so on.

The advantage of this engine is that compared with the turbojet engine, the thrust is larger, the efficiency is higher, and the larger the bypass ratio, the more obvious this advantage, the disadvantage is that it cannot be used in high-speed conditions (referring to supersound).

The small bypass ratio turbofan engine used by the fighter should belong to the compromise of the turbofan engine and the turbojet engine, of course, the small bypass ratio turbofan still belongs to the turbofan engine, this kind of engine can be applied to supersonic conditions, and even supersonic cruise can be realized, finding a better balance in the contradiction between speed and fuel economy.

However, at more than twice the speed of sound, the turbojet engine is still more advantageous.

Turbojet is another type of enhancement that uses the power output of a turbojet engine to drive a propeller many times larger than a fan to increase thrust, which can also be understood as using a larger fan than a turbofan engine.

The advantage of the propeller is that the thrust is greater and the efficiency is higher, but the disadvantage is that it is very noisy and the adaptation speed is slower, so it is mostly used in transport aircraft and other models that do not require high noise, and the speed of the turbo aircraft is slightly slower.

The turboshaft is a modification, which outputs most of the power of the turbojet through the gear or worm gear transmission to an output shaft at an angle of 90 degrees with the engine, which is equivalent to a turboshaft engine with many times larger slurry.