Genius is just the threshold for me!

Chapter 65 New Hot Aircraft Design

"However, silicon carbide coating alone can only absorb a portion of high-frequency radar waves. To achieve true stealth, it also requires corresponding technological design and engine nozzles..."

After Lin Dong finished writing the coating technology document, he looked at the technical parameters and thought for a moment. Then he opened the latest Hot Hot Design and made some modifications to the shape of the fuselage.

The stealth design of modern fighter jets is mainly reflected in three aspects: fuselage shape, engine nozzles, and radar-absorbing materials.

The earliest F-22 stealth fighter used iron-based materials and converted some radar waves into heat energy through the principles of magnetic hysteresis loss and natural resonance.

However, because iron-based materials have a high density and are not resistant to high temperatures, the latest microwave absorbing coatings are gradually developing towards carbon-based systems.

For example, silicon carbide and graphene absorb some radar waves and convert them into heat energy through the principle of dielectric loss.

However, regardless of the type of radar-absorbing coating, it can only target a portion of electromagnetic waves and can only provide partial stealth against current broadband phased array radars.

To achieve radar stealth, a special airframe structure design is required.

The fuselage structure uses special reflection angles to prevent radar waves from returning along their original path, ultimately achieving a stealth effect.

"The shape of the engine's nozzles also needs to be changed."

"Modern stealth fighters mainly use two types of engine nozzles: the rectangular nozzle of the F-22 and the serrated circular nozzle of the J-20, which are paired with infrared shields..."

Lin Dong paused here, but only for a second. The next second, he finalized the design of a serrated circular nozzle and an infrared shield.

For a stealth fighter to achieve stealth, in addition to the airframe's ability to block radar waves, the handling of the engine's infrared heat source is also of paramount importance.

After all, the combustion temperature inside the engine can reach as high as two thousand degrees Celsius, plus the release of hundreds of megawatts of power.

This results in the engine's nozzle appearing like a super-large light bulb on the infrared interface, illuminating the sky and brightening the horizon from the moment it appears.

At this point, as long as the infrared detection instruments are working properly, the infrared tracking missile is not blind and can easily lock onto the fighter jet's trail.

The previous F-22 stealth fighter jets all changed the circular nozzles to rectangular ones.

By using a rectangular structure, the high-temperature exhaust gas is flattened and elongated, transforming the exhaust gas that originally diffused in all directions into a directional jet stream, much like adding a beam beam to a large light bulb.

With this lampshade, unless the infrared detector happens to be pointed at the rear of the fighter jet, the engine's heat source will no longer be detected from other directions.

In addition, the edges of the rectangle are more stable in reflecting radar waves. By adjusting the structure of the rectangle's edges, such as adding serrations or special angles, radar waves can be reflected in other directions instead of returning along the same path and being detected by enemy radar.

However, the rectangular engine nozzle design has an unavoidable drawback.

That is, compared to a circular nozzle, a rectangular nozzle will greatly reduce thrust efficiency, causing the engine to lose a lot of thrust.

Because of this issue, subsequent F-35 fighter jets in the United States, including the J-20 fighter jet in China, have all been reverted to circular nozzles.

By adding circular sawtooth design, radar wave reflection is reduced, and infrared shielding is used to reduce infrared heat sources.

For Lin Dong, ensuring the power of his Hot Spicy engine was a priority, which meant that only a circular nozzle design was viable.

"Done!"

After determining the shape of the engine nozzles and adjusting other details of the fuselage, the basic layout of the new Hot Air, which took Lin Dong more than a month to complete, was roughly finalized.

"This looks a bit like the J-20A..."

Lin Dong exited the specific design interface, opened the global 3D model, and couldn't help but show a strange expression as he looked at the 3D shape of the fighter jet.

Without him.

This brand-new Hot Air fighter jet bears at least seven or eight points of resemblance to the J-20A fighter jet in his memory.

It's just smaller, with a longer fuselage and a flatter profile, like a J-20A fighter jet that's been flattened and elongated.

But he swore that when he designed this brand-new Hot Air, he did not refer to any other aircraft.

"Fluid dynamics guided, aerodynamics guided?" Lin Dong thought for two seconds and quickly understood the reason.

Because the shape design and aerodynamic layout of fighter jets must comply with aerodynamics and fluid dynamics.

When the aerodynamic performance of a fighter jet reaches a certain value, then under the guidance of fluid mechanics and aerodynamics, different fighter jets will gradually tend to the same shape standard.

However, his Hot Air version has a higher service ceiling, more powerful overload acceleration, and can transform into a "fighter jet missile" when necessary.

In order to reduce the frontal area and increase the top speed and acceleration, the overall height ratio was flattened and the fuselage wingspan ratio was increased.

"7806mm in length, 4385mm in maximum wingspan, 1.78 fuselage-to-wingspan ratio, 1078mm in maximum height... Such dimensions are sufficient to equip more powerful equipment and radar, but the fuselage height seems a bit flat."

Lin Dong looked at the three-dimensional dimensions of the brand-new Hot Number, a thoughtful look appearing in his eyes.

At 1078mm in height, it is 231mm shorter than its predecessor, the Hot 2.

This, combined with an increased wingspan of 4385mm, makes the new Hot Air's aspect ratio look like a dart with ridges.

"With such a flat shape, the windward surface is smaller. If missile mode is activated, the speed at a low altitude of 10,000 meters can reach Mach 8, and the critical high altitude speed can exceed Mach 10..."

"The silicon carbide coating has a melting point as high as 2700 degrees Celsius, which can withstand the thermal barrier caused by any speed, but to meet the aerodynamic performance requirements of this fuselage, a sufficiently powerful engine is necessary..."

Lin Dong pondered which engine would be suitable for the current Hot Number, then opened his email and sent the fuselage blueprints to Lin Weiliang.

[Lin Dong]: Dad, please help me apply for a hypersonic wind tunnel test.

Although Lin Dong had already conducted rigorous calculations on the shape and aerodynamic layout of the entire fuselage.

However, the Navier-Stokes equations, which are the core of fluid mechanics, do not have an exact solution; we can only find an approximate one.

Even with this hypersonic aircraft design, Lin Dong would still request to have it blown in a wind tunnel once or twice to actually verify the parameter errors.

After all, it flies at supersonic speeds, and unmanned combat aircraft can reach overloads of tens of Gs.

At such speeds and under such overload, even the slightest error would be a terrifying disaster.

Ring ring—

After sending the drawings to Lin Weiliang, Lin Dong opened the internal 3D simulation design software to prepare for perfecting the engine design of the new Hot Hot Number. At this moment, two messages popped up on the secure phone next to him.

[Lin Weiliang]: ? ? ?

[Lin Weiliang]: Lin Dong, look at my desktop. Do you think I have time to do this wind tunnel experiment?

[Lin Dong]: There is a special confidential department for supersonic wind tunnel tests, and you don't need to be there. Dad, you can apply for it for me.

[Lin Weiliang]: It's not that I don't need to be there, I'm just afraid they'll treat me like Superman! While preparing a swarm system for a military exercise, he can also pull out a hypersonic aircraft.

[Lin Dong]: Dad, keep it up! If anyone asks, just say you filled out the application form for Chief Engineer Wang.

[Lin Weiliang]: ...I thank you on behalf of your godfather.