Excuse me, does the jet need turbocharging?

The jet engine of an aircraft arranges the compression chamber and the combustion chamber in series, and uses the turbofan to suck in a large amount of air, not directly, but through the static pressure of the air, that is, the pressure generated by the sudden deceleration of a large number of high-speed air with a large inlet and a small outlet. The air at high altitude is thin, and the jet engine of the aircraft uses the turbofan engine to accelerate the air for the second time when the aircraft and the air have made relative motion. After twice accelerated air compression, the compression chamber in front of the combustion chamber will ignite the mixed gas in the combustion chamber through multi-point injection of fuel, so the fuel is required to have extremely high volatility and discrete ability at low temperature. The air vortex in the compression chamber is like the spiral compression of the turbocharger, so there is only one place for air flow, and that is the compression chamber. Then the burning part. Before the detonated high-temperature mixed gas is ejected from the nozzle behind the combustion chamber at a high speed, the high-temperature gas pushes the exhaust turbine of the combustion chamber, and the exhaust turbine is coaxially linked with the intake turbine of the air inlet of the compression chamber to realize continuous air suction. >: compression->; Mixed fuel->; Explosion->; Push exhaust->; Generate thrust to push the plane forward. Because the turbofan engine of aircraft transmits energy axially, that is, the direction of airflow is consistent with the direction of transmission shaft, so the efficiency of this turbofan engine is higher than that of automobile turbocharging system.

The turbocharging system for automobiles uses the 600-700-degree gas waste gas generated after the first stroke of the engine to push the waste gas turbine to be sucked into the compression turbine coaxially, and the rotation speed can reach about 10000 rpm, thus enhancing the intake air and increasing the intake pressure of the engine by 50%-250%, thus improving the fuel utilization rate and improving the engine efficiency through complete combustion. However, because the airflow of the automobile turbine is perpendicular to the transmission shaft, the efficiency is reduced and the mechanical friction is caused.

Usually the engine is naturally aspirated by NA, and there is an air filter in front of the air inlet. However, after turbocharging, more air flows in, so a larger diameter air filter, the so-called mushroom head, is needed. Removing the mushroom head is the air inlet, and the air inlet of Subaru impreza is the air inlet of the intercooler, not the air inlet.

Another point is that the pressurization system cannot increase the proportion of oxygen in the inhaled gas, because the proportion is the same, except that there is more air inhaled, and the indicator of more air is air pressure.

Relief valve is a device to solve the inertia problem of exhaust gas driven turbine. When we collect oil, the throttle opening decreases rapidly until it is in the closed idle state, which means that the engine does not need air intake, otherwise the air flow in the intake pipe will be blocked at the throttle. But at this moment, the turbocharger has not stopped working! Due to inertia, the turbocharger still keeps rotating at a speed of over 654.38+ million revolutions per minute. Now it is conceivable that the air is still being compressed into the intake pipe. If this part of high-pressure air cannot be discharged in time, the pressure in the intake pipe will rise rapidly, which may cause the throttle valve to be damaged or the intake pipe to burst.

At this time, it is necessary to install a pressure relief device in the intake pipeline to discharge the excess high-pressure air compressed by the intake turbine in the pipeline. In fact, the pressure reducing valve is a valve installed on the intake pipe to control the boosting pressure. The opening and closing of the pressure reducing valve is controlled by an electromagnetic coil operated by ECU (Electronic Control Unit). ECU will make a judgment according to the pressure of turbine outlet pressurization. Once the pressure exceeds the critical value, the electromagnetic coil will be turned on or off, and the pressure relief valve will be turned on or off.

Bottom line: In addition to turbocharged engines, there is also a supercharging technology. Simply put, the engine outputs directly to an air compressor, which is connected by a steel belt. This technology has no so-called turbo lag problem, because it has already participated in the air compression step at the beginning of the stroke, so it is more direct, but it becomes the load of the engine at the high speed, so the output of the supercharged car is concentrated at the low speed, while the output of the turbocharged car is mainly at the high speed.

In recent years, with the innovation of technology, the hybrid technology of turbo iteration, twin-turbo parallel connection and mechanical turbocharging has been gradually applied to some high-end models.

Summarize a theorem, under the condition of constant fuel, the more air is mixed, the higher the engine efficiency is. Considering only the low ignition point of gasoline, the high-pressure mixture will spontaneously ignite before the stroke begins. This requires a large-flow intercooler-intercooler to cool the high-pressure air and then mix it. Diesel engines do not have this problem. At the same time, diesel oil is a high-carbon oil, which needs more oxygen to intervene in the combustion process. So TDI technology came into being, which changed the situation of black smoke rolling in diesel vehicles. Audi Top participates in Le.