The Military-industrial Scientific Research System of the Academic Master Chapter 106

Chapter 106 The strongest turbojet! (Additional update 28 for monthly ticket owner flankerr)

73.5KN, according to the expression custom 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 Yan Zhongcheng, who had always maintained his composure, twitch the corner of his mouth slightly.

But he still held back his laughter in the end.

“Ahem—”

“Are you sure you can stabilize this thrust data? Have you not broken through the common operating line?”

Due to the "performance margin" mentioned before, aero-engine performance can be improved through aggressive measures, at the expense of reduced lifespan and reduced 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 operate beyond the limit.

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

While speaking, 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 was not particularly surprised by this figure. When he conducted simulations after completing the design, he had already roughly calculated that the improved compressor could provide about 10% performance optimization, and the actual product's performance exceeded this level. Not at all normal.

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

“Don't be impatient and finish this round of air performance test first!”

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

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

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

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

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

But in the past few decades, he has experienced too many failures.

There have even been cases where the engine was in normal working condition and seemed to have very stable performance one second, but suddenly suffered a major accident the next second, causing the prototype to be completely destroyed.

There have also been times when equipment malfunctions caused errors in the real-time readings on the computer, and it was only after the experiment that it was discovered that the joy was in vain.

So he really didn't dare to relax mentally at all until the entire experiment was over and he saw the official results of the final output.

Time passed by minute by second, and the entire operating room could almost only hear the whistling sound of high-speed airflow flowing through the impeller machinery, and the password of the test conductor.

“Start adjusting the total inlet pressure, step size 6.0kpa, 15 measurement status points…”

“The maximum thrust test is completed, adjust the throttle lever position to the maximum continuous position…”

“Quickly adjust the throttle lever to switch between the maximum continuous and minimum afterburner states.”

When the experiment finally reached this point, even Chang Haonan felt a little nervous.

Thrust transient itself is a separate test subject, but in fact it will also be involved during other tests.

Just like now.

As for the rapid oil recovery under afterburning, the No. 01 prototype aircraft induced surge during this process.

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

"Turn off the afterburner and adjust the throttle lever to the middle..." The engineer in charge tried to keep his voice calm.

Finally, the last data point in the last flight idle state has been recorded.

“Steady-state performance test, end...”

As the last command was given, everyone's attention returned to the equipment in the center of the operation room.

Long pieces of graph paper were slowly spit out from the special printer.

Before one end of the paper fell to the ground, it had already been taken away by impatient people.

As long as the high-altitude platform is activated, it will be a gold-eating beast. For Chinese military workers who are eager to dig out money from 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.

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

At almost the same time, the engineer who had just used his laptop to process data in real time also completed his work and began to compare the compiled data report with the curve on the graph paper.

"Wow-"

After about a few minutes, maybe more than ten minutes, the first voice finally broke out from the crowd.

“This is actually a...turbojet engine?”

“This data is even more powerful than J79…”

“Too conservative, this is completely out of the same performance dimension as J79…”

As more and more graph paper recording data is printed out, the atmosphere in the control room becomes more and more lively.

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

The clenched fists were slowly loosened, and there were even a few blood marks on the palms of the hands dug by nails.

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 been bound.

“Mr. Yan, Dr. Chang, this is a performance report. Data has been randomly tested against the original records, and no problems have been found.”

Yan Zhongcheng spread out a dozen pages of reports on the table in front of himself and Chang Haonan.

Then he knew the source of those exclamations just now.

Not only has a maximum thrust of 73.5KN.

Fuel consumption rate under maximum afterburner is 0.207kg/(N·h)

Middle thrust 48.3KN

Fuel consumption rate under intermediate thrust state is 0.088kg/(N·h)

Total boost ratio 18.6

Total air flow 66.4kg/s

As an aviation power expert, Yan Zhongcheng naturally knows the significance of these numbers.

No wonder someone just said this doesn't look like a turbojet engine.

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

The R11F300, a replica prototype 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, let alone these old-timers, even if the U.S. military served in the 1980s, the third-generation turbofan engine F404-400 equipped on the F/A18 fighter jet, with 71.2KN afterburning thrust/983kg curb weight, is only It was on par with the Turbojet 14 in front of me.

If compared in all aspects, apart from the fact that the fuel consumption of the turbojet engine cannot be reduced due to the limitations of physical principles, so there is still a gap in fuel consumption and efficiency, the improved turbojet 14 can completely compete with the F404-400 A tie.

From a technical perspective, it is definitely the most powerful turbojet!

(End of this chapter)

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