Chapter 965: Show their skills

Helicopter engines don’t have a car silencer, and it’s impossible to have them. Exhaust gas is also thousands of degrees. What silencer can withstand the constant test at this temperature, so from the combustion chamber After the combustion is completed, almost all are directly discharged.
Only the naval retrofitted naval gas turbine will have a flue. After all, in that place, refractory bricks can be used.
But the helicopter is not good.
I saw thick black smoke coming out from the top of the dolphin helicopter. It was a situation where the fuel injected by the engine could not be completely burned. The smoke billowed and almost recruited the fire truck.
No matter how you look at it, it looks like the engine is on fire.
It would be great if I could light it. The problem now is that I can’t light it!
No matter what the engine is, the principle is almost the same. It blows into the wind, then ignites, and then provides power.
Then, when different air is blown in, the fuel required for ignition is also different. In this plateau situation, the air is thin and the oxygen content is small, so correspondingly, the fuel that needs to be injected is less, so that it can be sufficient. combustion. However, the Dolphin helicopter has not been tested on the plateau, so it is still sprayed at low altitudes, so a situation has occurred.
Fuel was injected, but there was not enough oxygen.
It is true that there is fuel that can burn, but there is still a considerable part of it that cannot be fully burned, and it becomes black smoke, and this black smoke also extinguishes the fuel that has just been lit.
This is a carbon dioxide fire extinguisher!
The engine overhead was rustling, and the black smoke kept coming out, but it just couldn't be lit!
It lasted for half a minute, and the pilot reluctantly stopped common sense, the battery was already in an absolute state of power loss and could no longer be started.
How to do?
Disassemble the battery, charge it, and then common sense when it is fully charged.
Now, the morning time is soaked.
Back then, when Han's aviation troops decided to station at the plateau airport, they actually went through this process. In order to start the engine at high altitude, everyone tried gradually, one thousand meters, two kilometers, and continuous improvement. The altitude, the accumulation of experience, can finally be deployed here.
But now, without experience, rashly running to this place more than 3,000 meters above sea level to start, it is difficult to succeed.
This is different from air starting, because when starting in the air, the aircraft has speed and can rush into the engine more air. At the same time, the engine can also be rotated by the impact of the airflow, which is completely different from starting on the ground. . The first attempt of Ji Guo, but it was the first to fail. The pilot fell down dejected and looked here.
Hmph, our can’t start successfully, and you guys are not much better!
Next to them, there is the Bell 212 helicopter, which is arranged in the order of yesterday. When the pilot of the chicken country looked helplessly here, he suddenly felt very angry in his heart. Sure enough, the Eagle countryman was even more cunning!
wind direction.
On the plateau, the wind is very strong, and when the pilots of the Eagle Country are docking the helicopter, they are just leeward, blocked by the wind by their own helicopter, and the cooling of the other's helicopter is not as strong as their own.
This small advantage will be taken up, see if you can start it smoothly!
Later, I heard the peculiar whistling sound of the starter of the same turboshaft engine. But when he heard it, his face was ugly.
Cheating, cheating!
Bell 212 is a five-ton helicopter. Because of its larger fuselage, it carries more equipment. For example, it can carry APU!
APU, called auxiliary power unit, refers to a small auxiliary power unit that can independently output compressed air or power supply in addition to the main power unit on an aircraft. It is generally a small gas turbine engine.
It includes power output shaft, compressed air extraction device and automatic control device.
Before takeoff, it provides compressed air for the aircraft, which can be used to supply air to the air-conditioning system of the aircraft or to provide air for the main engine starter to start. It can also output power to the aircraft power system before the main engine starts, reducing the aircraft’s dependence on airport equipment .
With this device, you can start the engine calmly! Although the battery energy of the helicopter is limited, as long as the APU is activated, the power is unlimited. Even if it is activated ten times or eight times, there is no need to worry about power loss.
At the same time, in addition to its function before take-off, this device can provide emergency energy to the aircraft when the main engine or its power generation device fails during flight, and improve flight safety; it can also provide energy for the aircraft during landing.
However, this thing is not available in any aircraft. Generally speaking, auxiliary power units are only installed in large and medium-sized aircraft and large helicopters.
The Bell 212 of the other party is a five-ton helicopter, which is barely a medium-sized helicopter. It is also installed with this device. What is this not cheating?
In a puff of black smoke, the APU was activated three times in a row, and the APU was finally activated. When the black smoke from the APU gradually faded, the people in Jiguo felt very uncomfortable.
The Bell Company, it definitely came prepared! At least they will not be eliminated in the first stage.
There is no suspense for the start of the Bell 212 helicopter, and the remaining two models are truly on their own.
In severe cold weather, the battery capacity will decrease, which is a common phenomenon. (If you ride a battery car, you will find that the distance you run in winter is much lower than that in summer. That's why.)
So, if you want to increase the performance in severe cold weather, especially on the plateau, then increase the capacity of the battery!
The Noodle Country’s A109 is based on real skills. It doesn’t require any APU to start it on its own power. At the same time, it’s also because their engine has built-in new programs. In high altitude areas, it can’t start. Easy, that's because there are too many fuel injections, so set it in advance and inject less fuel!
As for the Black Hawk helicopter, it was because of its built-in APU, not specifically cheating for this plateau test.
The roar of the engines sounded one after another. The rotors on the top of the two helicopters were turning hula hula, and they were already in normal operation.
The helicopter does not have a clutch. When the engine rotates, the propeller will rotate with it.
Ji Guoren stared. They can't even participate in the next project. Are they even eliminated now?
If everyone fails to start successfully, they are still standing on the same starting line. Now, they are ashamed of themselves.