To simulate the test, first of all, it is necessary to have a strong inlet air flow, and the core machine of this test is different from the ordinary aero engine test, there is no pre-compression of the airflow by the low-pressure compressor, which puts forward higher requirements for the ability of the high-altitude platform.

At this time, the entire high-altitude platform equipment needs to run at full speed, and a large amount of energy required has already burned rapidly, and a seemingly inconspicuous three furnaces next to the high-altitude platform consume enough natural gas to provide the natural gas needed for a medium-sized city, and the air that is about to enter the high-altitude platform is heated here.

The heaters (cupolas) are fueled by natural gas, which is now enough to supply 400,000 households.

AFTER DEVOURING A LARGE AMOUNT OF NATURAL GAS, IT ALSO BURST OUT WITH AN ASTONISHING AMOUNT OF ENERGY, WITH A FLOW OF UP TO 52 KG/S OF AIR FLOWING THROUGH THE CUPOLA, WHICH IS MATCHED TO THE DESIGN FLOW RATE OF THE CORE MACHINE, AND NOW THE AIR FLOWING THROUGH THE CUPOLA IS ALREADY HOT.

THE TEMPERATURE OF UP TO 650K IS CONVERTED TO NEARLY 400 DEGREES Celsius, and if the air at such a high temperature is blown on people with a flow rate of 52KG/S, I AM AFRAID IT WILL BE A LONG TIME AGO

But now it is different, these high-temperature air currents are sent into the high-altitude cabin, and then sucked into the compressor of the core machine, after the rectification of the first stage of support point support ribs and rectifier stators, it appears relatively smooth.

Then it is sucked in by the high-pressure compressor that rotates at high speed, and after the first-stage titanium alloy impeller is compressed, the flow rate increases again, and then the stator rectifies the pressurized air again, and then enters the second-stage compressor impeller to further pressurize.

And so it is compressed layer by layer. Not only is the air compressed harder, but at the same time, more mechanical energy passes through the air flow and the contact between the titanium impeller. The internal energy that is effectively converted into air rises again.

After compression of the first three-stage titanium compressor impeller. The temperature of the air is no longer what titanium alloy can bear, and if the fourth-stage impeller is also made of titanium alloy, it can directly make the fourth-stage impeller burn.

Therefore, starting from the fourth-stage compressor impeller, the titanium alloy with good mechanical properties had to be abandoned, and the blades specially developed for the high-temperature environment were installed with the next five-stage compressor and stator, only in this way can we ensure that when the final air compression is completed, the entire compressor will not be damaged and can continue to work.

The high-temperature air that comes to the combustion chamber is mixed with the pneumatic atomizing nozzle. They are ignited together, and the mixed gas is ignited, begins to expand dramatically, and is fed into a high-temperature turbine behind it.

At this time, the high-temperature turbine must naturally be able to withstand ultra-high temperatures, and the high-temperature gas on the turbine is sharply washed away, and while transmitting high temperature to the turbine, the turbine is also rotated at high speed, and the gas passes through the gap between the turbine blades, and is rectified again by the stator.

After such a period of hardship, the high-temperature gas that was sprayed out was already red-faced. The unbound active gas molecules are ejected backwards under the subsequent high-temperature gas squeezing, which is an important power source for the turbofan engine.

At this time, the entire core machine is considered to have started work, and the subsequent speed of the core machine is to increase it. Until the design speed is reached, it even needs to run beyond the design speed, which is similar to the overclocking operation of the CPU of an electronic computer.

Let's not talk about how to accelerate the rotation speed of the core machine. And how to achieve full power operation, the current problem is that the high-temperature gas sprayed by the core machine in the high-altitude warehouse needs to be discharged in time.

In order to discharge these high-temperature and high-speed gases. In addition, a complex exhaust system is required, which is even more inverse than a cupola furnace that heats high-speed air.

What needs to be discharged from the exhaust system is high-velocity gas after the core engine has been combusted. The entire core machine can be regarded as a single-rotor turbojet engine, and its thrust has far exceeded the turbojet 6 engine used in the J-6 fighter.

The gas generator, which is more powerful than the turbojet 6 engine, produces high-temperature gas that needs to be quickly pumped out of the high-altitude simulation chamber.

This requires a large number of exhaust devices to work, which are connected in parallel to pump out these high-temperature gases, which inevitably leads to heat exchange, resulting in a sharp increase in the temperature of the exhaust device itself, in order for the exhaust device to work continuously, it is necessary to have a strong cooling system.

To complete the continuous cooling of the exhaust device, the best medium is water cooling, which is the best and most practical, and a large amount of water is drawn from the reservoir that has been built early in the morning to complete the cooling.

In this way, the use of the high-altitude cabin of the aero engine can be realized, and it can test the engine that needs to be tested in various airspace environments.

And the people here have just experienced this kind of life, and they don't know if it is the luck of the country or their misfortune, but in the eighties and nineties, without the power generation of the Three Gorges Project, it was certainly impossible to use electricity wantonly.

Thirty-five minutes have passed since the core machine started the test, and Yang Hui and others are anxiously waiting for the final result, just like countless parents waiting for their children to come out of the examination room outside the college entrance examination room.

There are both apprehension and excitement in my heart, and there are more other feelings, anyway, there are all kinds of mixed tastes, until the entire high-altitude platform slowly stops running, which means that more than half an hour of testing has been completed, and the results have been on paper.

"Come out, come out, everyone come with me!"

Waving a mule paper in his hand, Chief Engineer Liu had irrepressible joy on his face, just now Chief Engineer Liu watched the test of the core machine in the data measurement and control center, although this is only the first full-power high-altitude platform test, but this time is also the most important one.

Although the data obtained this time is not too detailed, it can also draw a rough idea, and the specific situation of some core machines can be deduced from this test.

The whole process of monitoring the test of the core machine, Chief Engineer Liu already knew in his heart, the data had just arrived and had not yet begun to carry out preliminary analysis, so Chief Engineer Liu rushed out to report the good news, and beckoned everyone to sit down and analyze together.

They quickly found a front position and sat down, waiting for Chief Engineer Liu to take out the data in his hand and report it to everyone. Seeing dozens of pairs of green eyes staring at the thin ten pieces of paper in his hand like hungry wolves.

Chief Engineer Liu suddenly felt that the more than ten pieces of paper had a total amount of 1,000 catties, picked up and opened the stack of papers, carefully looked at the data in it, and wrote and drew on another piece of straw paper, and suddenly stopped

After a few seconds, he reacted again, and his heart was in a burst of ecstasy, and he suppressed his excitement and recalculated it twice, comparing the final data obtained from the three times, which was no big problem.

"The total inlet temperature of the core machine at sea level is 443.88K, the inlet pressure is 3.794MPa, the air flow is 52.56KG/S, and the temperature before the turbine is 1412 degrees Celsius. In the half-hour test, we roughly tested the power loss of the entire engine from sea level all the way to an altitude of 24,000 meters, and the thrust curve did not show a significant drop until 22,000 meters of thrust. ”

At 19,000 meters, a large power loss began to appear, indicating that although the high-altitude performance of this core machine is not too good, as long as the channel ratio of the low-voltage fan is not too large, it is not used as a high-altitude interceptor.

It's absolutely no problem to do a third-generation fighter with a third-generation fighter power that pays attention to medium and low altitude performance, and there is no problem with the engine of a passenger aircraft, what passenger plane wants to fly to an altitude of 20,000 meters? (To be continued.) )