73.5KN, according to the expression habits in the field of aviation power, is roughly equivalent to 7500kgf (kilogram force).

Combined with the 1040kg dead weight of the improved turbojet 14, it is not difficult to calculate that the thrust-to-weight ratio of this engine at sea level is as high as 7.2.

This number even made the corners of Yan Zhongzhongdu's mouth, who had always maintained Gujing, twitch slightly.

Eventually, though, he held back his laughter.

"Ahem—"

"Are you sure you can stabilize this thrust data, and you haven't broken through the common working line, right?"

Due to the "performance margin" mentioned earlier, the performance of aero engines can be improved by beating chicken blood, at the cost of reduced life and reliability.

Especially for engines that are still in the prototype testing stage, because there are no restrictions at the control system level, it is easy to overrun.

"This ...... The thrust data is currently very stable, and the general characteristic curve data needs to be calculated. ”

As he spoke, the engineer who had been observing the data had already taken another laptop from the side and started analyzing the data on it.

Chang Haonan is not particularly surprised by this figure, when he completed the design and carried out the simulation, he had already roughly calculated that the improved compressor could provide about 10% of the performance optimization, and it is normal for the actual product to break through a little bit on this basis.

But there were already a few people who couldn't sit still, and who didn't have much important work at hand, and wanted to get up and go over to watch.

"Don't be impatient, finish this round of air performance tests first!"

Yan Zhongzhong didn't react on the surface, but judging from his slightly trembling and hoarse voice, his heart was by no means so calm.

It's certainly not that he doesn't want to celebrate.

In fact, although according to the requirements of the standard, about 10 different inlet total pressure state points should be selected for the high-altitude simulation assessment test to correspond to the average working state of the engine within the test range.

However, this time the data to be tested is only the most ordinary sea level thrust, and if the data can be stabilized at a state point, there should be no problems.

After all, the speed range to be simulated is only Mach 0.4-0.6.

But he has failed too many times over the past few decades.

There have even been cases where an engine that was working normally one second and seemed to be performing very steadily had a major accident the next second, and the prototype was completely destroyed.

There have also been times when the real-time reading on the computer was wrong due to equipment failure, and it was only at the end of the test that it was found to be empty joy.

So until the end of the whole experiment and the official results of the final output, he really didn't dare to relax a little mentally.

Time passed minute by minute, and the entire operation room could almost only hear the whistling sound of high-speed air flow through the turbomachinery and the sound of the test commander's password.

"Start adjusting the total inlet pressure in steps of 6.0kPa, 15 measurement status points......"

"Maximum thrust test complete, adjust throttle stick position to maximum continuous position......"

"Quickly adjust the throttle stick to switch between the maximum continuous and minimum afterburner states."

Finally, when the experiment came to this point, even Chang Haonan felt a little nervous.

Thrust transients are a separate test in their own right, but they are actually involved in other tests as they are conducted.

Like now.

As for the rapid oil recovery in the afterburner state, the No. 01 prototype is the surge induced in this process.

Fortunately, both the sound of the engine and the numbers displayed on the computer screen fluctuated for a moment, and then returned to normal.

"Turn off the afterburner and adjust the throttle stick to the middle ......"

The engineer in charge of the command struggled to keep his voice calm.

Finally, the last data point in the last slow flight state was recorded.

"Steady-state performance test, end ......"

With the last command, everyone's attention was refocused on the equipment in the center of the operator's room.

Long pieces of coordinate paper are slowly spit out from the dedicated printer.

Before one end of the paper could fall to the ground, it was already taken away by impatient people.

As long as the high-altitude platform is activated, it will be a gold-swallowing beast, and for the Huaxia military workers who are eager to pick out the money from between their teeth, it is naturally impossible to have the luxury of testing only one maximum thrust at sea level in one test.

Other data is equally important.

Moreover, everyone wants to know what kind of comprehensive performance this engine with a maximum thrust of 7500kgf will give.

At about the same time, the engineer who had just processed the data in real time on his laptop was doing his job and began to compare the collated data report with the curves on the coordinate paper.

"Wow-"

After a few minutes, maybe ten minutes, the first voice finally broke out in the crowd.

"It's a ...... Turbojet engines? ”

"This data is even more powerful than J79......"

"It's too conservative, this is completely different from J79 in the same performance dimension......"

As more and more coordinate paper with data recorded is printed, the atmosphere in the control room becomes more and more enthusiastic.

Listening to the discussion and admiration of his engineers, Yan Zhongzhong finally breathed a sigh of relief.

The clenched fists slowly loosened, and the palms had even been cut out by the fingernails with a few blood marks.

Finally, the engineer who first reported the maximum thrust data squeezed out of the crowd with the test report in his hand that had not yet had time to bind.

"Mr. Yan, Dr. Chang, this is a performance report, and the data has been sampled against the original record, and no problems have been found."

Yan Zhongzhong spread the dozen pages of the report evenly on the table in front of him and Chang Haonan.

Then he knew where the exclamation had come from.

Not only has a maximum thrust of 73.5KN.

Fuel consumption at maximum afterburner: 0.207kg/(N·h)

Intermediate thrust 48.3KN

Fuel consumption in the middle thrust state: 0.088kg/(N·h)

The total boost ratio is 18.6

The total air flow rate is 66.4kg/s

……

As an aviation power expert, Yan Zhongzhong naturally knows the significance of these figures.

No wonder someone just said that this is not like a turbojet engine.

The typical second-generation turbojet J79 has a maximum afterburner thrust of 80 KN, but it is a 1800 kg behemoth.

The replica prototype R11F300 of the turbojet 7/13 has a curb weight similar to that of the turbojet 14, 1100kg, but the maximum afterburner thrust is only 60.3KN.

In fact, don't say it's these old-timers, even the third-generation turbofan engine F404-400 that was put into service in the U.S. military in the 80s and equipped on the F/A18 fighter jet, with a 71.2KN afterburner thrust / 983kg curb weight, is only in the middle of the turbojet 14 in front of him.

If compared in all directions, in addition to the fuel consumption of the turbojet engine due to the limitation of physical principles, there is still a gap in fuel consumption rate and efficiency, the improved turbojet 14 can completely tie with the F404-400.

From a technical point of view, it is definitely the strongest turbojet that deserves to be!

(End of chapter)