Chapter 327 It’s not as simple as flying with a big brick
In the non-afterburning state, the acceleration performance of this engine is very good, almost half of that of many engines in the afterburning state. This is the consensus of Li Hai and Mao Lele.
At this time, Li Hai gradually realized that the mysterious reason for this engine was probably due to its performance in the non-afterburner state.
He couldn't help but think of something his master Li Zhan said to everyone at the aviation school.
At that time, it was an overview of the world's main fighter jets. On the podium of the multimedia lecture theater, he looked serious and solemn, pointing the laser pointer at the PPT on the large display screen.
"Fifth-generation aircraft have four major characteristics: stealth, supersonic cruise capability, super maneuverability, and super information advantage. This was proposed by the Americans. They were the first to develop fifth-generation aircraft and the first to mass-produce them. That was at the end of the last world.
Things, they define the standard.”
"The four major characteristics are indispensable. Only when they fully possess these four characteristics can they be classified as fifth-generation fighter jets. Some fighter jets that possess some of these characteristics are defined as fourth-and-a-half-generation fighter jets. For example, my country's J-10 , France's Rafale, Europe's Typhoon, Russia's Su-35, etc. The only fifth-generation fighter jets currently in service in the world are my country's J-20 and the United States' F-22. I myself have a lot of experience flying the J-20 Experience, I also introduced it to you in the introduction at the beginning of the semester. I have flown all the aircraft currently in service in our army, including helicopters."
"The supersonic cruise capability here refers to the uninterrupted cruise capability. In the supersonic cruise state, the maximum range of the fighter aircraft is a very important parameter. What I want to tell you is that in the early days of the J-20's service, it was
The reason why it cannot reach supersonic cruise is that the engines used in the early models of the J-20 were not satisfactory, and the problems were just solved."
"In the past few years, the J-20 equipped with domestically produced high-thrust engines has been put into mass production and has entered service. Whether it is super maneuverability or supersonic cruise capability, it has the foundation to exert the full combat capabilities of the J-20."
"Among the four major characteristics of fifth-generation fighter jets, the core of supersonic cruise capability and super maneuverability lies in the engine, especially the former. Generally speaking, in a combat, the total time that non-fifth-generation fighter jets turn on afterburner will not exceed two
Minutes, one-third of the fuel can be burned in these two minutes. Therefore, if you maintain supersonic cruise, you will have to return after a few minutes because the fuel is exhausted."
"To achieve supersonic cruise, the engine needs to be able to propel the aircraft to achieve supersonic flight without turning on afterburner, which is not easy!"
"None of the non-fifth-generation fighter jets can fly at supersonic speeds without using afterburners."
At this time, a student raised his hand and asked, "The British said that their Typhoon fighter jet has supersonic cruise capabilities and its maneuverability has reached the standards of a fifth-generation aircraft, so it is a fourth-and-a-half-generation fighter jet."
The atmosphere in the class is serious and lively, and students who have questions can raise their hands to ask questions.
Li Zhan smiled and said, "What the British said is true. The overall performance of the Typhoon fighter is not much better than our J-10C. The so-called supersonic cruise capability is actually incomplete. If it is supersonic
In this condition, the Typhoon fighter jet will definitely crash in ten minutes due to exhaustion of fuel."
After a pause, he said, "Instead, it is the French Rafale M fighter. I have flown this fighter for more than a hundred hours, and I have a deep impression. After being equipped with a new engine, the supersonic cruise time of the Rafale M is longer than that of the Typhoon fighter.
It is much longer. However, it still cannot meet the standard of uninterrupted supersonic cruise."
"Chief, the French like to brag, why did they stop bragging this time?" a student asked with a smile.
Li Zhan also laughed, "They also hide the really powerful things. They are stupid on the battlefield, but that doesn't mean they are stupid."
The class of hundreds of people laughed.
Li Zhan concluded, "In a word, the core is the engine. In the final analysis, it is still the engine. Although we have made great progress, there is still a big gap compared with some European engine powers."
…
Thinking of this, Li Hai basically guessed it.
The engine mounted on the J-15B must be a model with supersonic cruise capability. Maybe it is an improved model specially developed for the J-20 and installed on the J-15B for testing.
He couldn't help but wonder, then, can the J-15B achieve supersonic cruise?
Supersonic flight and supersonic cruise are two concepts. The former sprints at full speed, while the latter maintains continuous flight at transonic speed. The airspeed of the latter is about Mach 5.
The most critical point is that the fuel consumption during supersonic cruising can only be slightly higher than that of non-supersonic cruising, so that a supersonic cruising range of more than 1,000 kilometers can be achieved - the standard of supersonic cruising range is not exactly the same in all countries, Americans
I think that if I can fly 800 kilometers, I have reached the standard.
They believe that when a fighter jet continues to fly at an airspeed above Mach 5 for more than 30 minutes without using afterburner, this is its supersonic cruise capability. When converted, the flight distance is about 800 kilometers.
The standards of the Chinese people can only be higher, and they will only be higher.
High speed and low fuel consumption are always contradictory. As Li Zhan said, the core is the engine. In the final analysis, it is still the engine.
The aerodynamic shape of the J-15B is not much different from that of its predecessor, the Su-33. It can fly at supersonic speeds of Mach 2, but it is probably very difficult to achieve supersonic cruise. The Soviets advocate the concept of flying with great force.
, it doesn’t matter if there are some flaws in the aerodynamic shape, once the engine thrust increases, all problems will be solved.
Therefore, looking at the fighter jets developed by the Soviets, only the Su-27 family has a graceful and smooth appearance, almost a fusion of contradictions. Decades have passed and it has endured. Its appearance design has been learned by many countries.
At this time, Li Hai checked the position information. He was currently at an altitude of 3,200 meters, with a speed of 860, heading due south, and was already 90 kilometers away from the base. At this time, the next action was to fly at supersonic speed.
He decided not to turn on afterburner, but pushed the throttle lever all the way to test the fastest speed he could fly without turning on afterburner.
The fuselage seemed to have been pushed hard by a big hand, or blown by a sudden strong wind. It suddenly accelerated forward and flew forward. The inertia was very large, and Li Hai's body was pressed against the back of the seat.
, a bit of a push-back feeling caused by the throttle of a turbocharged car, with about two seconds of lag in the middle.
He stared at the airspeed number, which started to increase rapidly from "860" and soon approached "1000". This process took no more than three seconds. When converted, it only takes a little more than one second to accelerate from 100 kilometers to 100 kilometers.
time.
The number continued to increase, but soon Li Hai clearly felt that the air resistance suddenly increased. When it reached "1150", the acceleration momentum of the fighter dropped, but it still maintained acceleration, and the airspeed number climbed up bit by bit.
At "1220", the airspeed figure climbed more slowly, but it still showed tenacity.
In fact, taking into account the effects of air humidity, altitude, etc., this speed is already equal to the speed of sound. Li Hai in the cockpit heard a huge rumble, and the fuselage trembled slightly. He even saw the distorted air in front of the nose.
.
A few seconds later, the fighter jet pierced the air and broke through the sound barrier. The huge rumble disappeared, which meant that the sound was already behind the fuselage. The fighter jet's speed exceeded the propagation speed of sound, which is supersonic speed.
"Damn, this engine is so awesome!" Li Hai was surprised.
Because the training was on basic subjects, the fighter aircraft did not have any mounts, so the flying resistance was objectively much smaller.
Even so, there are very few active fighter jets in the world that can fly at supersonic speeds without using afterburner and without a load.
The actual performance of the J-15B is also too surprising.
To be precise, it is the performance of the new aeroengine mounted on the J-15B that is surprising, unexpected, shocking and incredible.
No wonder some of the information about this new type of aero-engine is even kept secret from the pilots undergoing test training. This kind of technology, not to mention leading the world, at least keeps pace with the world's advanced aero-engine technology.
Li Hai remembered that his master once said that the aeroengine carried by the French Rafale M is technically a typical representative of the world's military aeroengines. Some design concepts are world-leading and represent a relatively new development direction.
In Li Hai's impression, his master approves of the Rafale M, especially the power system. The engine diameter of the Rafale M is smaller than that of the Russian-made AF-31F and the American-made F-110 series, and is of medium caliber.
, the overall performance does not lag behind at all, and even partially surpasses it.
In the master's position, he is considering the development direction of my country's military aviation engines, and the French guy's ideas can be used for reference.
Perhaps, the new aero engine equipped on the J-15B is the product of this idea. Other aspects are still unclear, and it will take a lot of aerobatics and various envelope test flights to have a comprehensive understanding.
But in terms of acceleration and thrust loss, the performance of the new aero engine can definitely be rated 90%.
Before the fuel bottomed out, Li Hai followed Mao Lele and returned. The landing sequence was the same as the take-off sequence, but the landing direction was different because the wind direction had changed.
The commuter bus picked up Luo Falcon and Mao Lele, and then came to Hangar No. 583 to pick up Li Hai.
Unexpectedly, there were Chief Engineer Yi and a man in his thirties with long hair and an unkempt beard in the car.
After getting off the car, Luo Falcon put his flight helmet under his ribs and said, "You have all met Li Hai, Mao Lele, and Mr. Rong. This is Gao Qiang, senior engineer, the leader of the power team. Senior engineer..."
"Hello." Gao Qiang strode over before Luo Xuan finished his introduction, and quickly shook hands with Li Hai and Mao Lele.
Gao Qiang didn't wait for Li Hai and Mao Lele to speak, and asked hurriedly, "This is your first time to fly the J-15B. Can you tell me how you feel, especially the control and power? Yours
Feedback is extremely valuable to us.”
It can be seen that this is a technical person with low EQ and high IQ who only cares about technology. ()
