"squeak!"
The rounded metal pen tip left the surface of the pale yellow paper and stopped moving forward, leaving a black mark.
"Ta!" The black pen cap made contact with the pen holder and was buckled, and a clear and loud sound came out.
After writing the article, Zhou Hai put the black pen on the table and looked at the notebook full of block letters. The corners of his mouth involuntarily curved and he smiled, and his eyes showed a soft color.
At this moment, the whole person's heart is extremely peaceful, and the fluctuating emotions gradually calm down, without the previous irritability and depression.
The thoughts are clear and the whole body feels comfortable.
"Comrade Zuo Xue, I will keep working hard for us." Zhou Hai's steady and solemn words rang out in the room, rushing around like a tide, echoing in the small single-room dormitory, and unable to disperse for a long time.
effort.
We will keep working hard for the promises they made, for the ideals they established together, and for the 'us' they become after they combine with each other.
Not much to say, just a promise is enough.
Zhou Hai closed the notebook with both hands and twisted a small knot with the seal as a special mark to prevent peeking. If the knot is not correctly untied, it means someone has peeked.
A little trick.
After doing this, Zhou Hai put the resealed notebook and black pen back into the desk drawer, stood up, left the desk, and returned to the bed.
Lie down and close your eyes.
Zhou Hai, who had clear thoughts, felt natural and peaceful in his heart. He closed his eyes, and a feeling of sleepiness slowly came to his mind, and he quickly entered a state of deep rest.
Zhou Hai needs to rest to eliminate the tiredness he felt during this period of time, regain his energy, and adjust to his best condition.
The old saying is true, the sharpening of the sword never wastes the time spent chopping wood.
Proper rest will help you study better.
Inside the house, it became quiet again, silent.
It was approaching noon, the sun was blazing, and the weather was slightly hot. Wisps of sunlight entered the room through the gaps in the curtains and turned into beams of light, illuminating the desk and the floor.
The sky is clear and clear, cloudless.
The Qingcheng aircraft carrier base located in the south of Jiaowan is as calm and peaceful as ever, silently guarding the capital behind.
…
Star City.
The sky was dark and low, exuding a strong sense of depression.
The rolling dark clouds seemed to flow and change like water. They were so large that they almost enveloped the entire city, full of signs that a storm was coming.
Gusts of fast wind carried dust and debris across roads large and small.
Main campus of National University of Defense Technology, female dormitory building, single dormitory No. 16.
The room was as before, and there was a faint scent of lavender in the air.
On the surface of the desk, there is a pot of crystal succulents presented by Zhang Chuxue, which exudes a bright green color that symbolizes vitality.
"Tap-tat-tat..." A series of clear and loud keyboard tapping sounds were heard endlessly, full of rhythm, and they were echoing in the single dormitory of about 30 square meters.
The ten fingers, as delicate and tender as white onions, jump back and forth on the surface of the mechanical keyboard, like a dance, tapping the keyboard keys and typing characters.
Sitting at the computer desk, her long black hair falling vertically like a waterfall behind her back, Zuo Xue, wearing a light white uniform, has a serious and solemn face, her eyebrows are like swords, and her clear and agile eyes are staring at the high-definition monitor in front of her, as if Shine like stars.
light.
The light in the eyes.
The title of a top-secret scientific research report that had just been written appeared on the high-definition monitor screen with the words "Top Secret Equipment" written on the top border.
"Overview of the aerodynamic layout of a small aspect ratio forward-swept aircraft without vertical tail"
Author: Zuo Xue.
Corresponding author: Su Rui.
Summary:
In view of the fifth-generation fighter's characteristics of high maneuverability, high stealth, high intelligence, high range, directed energy weapons and manned and unmanned technology, the main design contradictions are analyzed, and the supersonic lift and drag characteristics, hypersonic drag characteristics and low-altitude Preliminary solution ideas are proposed for several design issues such as low-speed and high-angle-of-attack characteristics.
The author believes that it is necessary to conduct an in-depth study of the flow characteristics of new wing designs, tap the potential of forward-swept wing aerodynamic applications, use the existing foundation and conditions to propose a new design concept, and adopt corresponding overall control measures to balance many design difficulties. By making trade-offs, it is possible to fully achieve the design goals.
Keywords: high stealth, high intelligence, directed energy weapons.
I. Introduction:
Modern warfare has shown that fighter jets and airborne weapons are already the key forces that determine victory or defeat and can influence the course of the war. Air supremacy has become the most important component of modern warfare and the most intense struggle between the two sides.
In addition to further strengthening the 4S standards of the fourth-generation advanced fighter jets, the fifth-generation fighter jets must also have hypersonic cruise and high intelligence, as well as the ability to use directed energy weapons. At the same time, it is also a need to use manned and unmanned pilots together. Key factors to consider.
Therefore, the aerodynamic layout of the fifth-generation fighter should be as low as possible under the premise of meeting the high stealthiness constraints of the appearance, reducing the resistance of hypersonic cruise as much as possible, improving the maximum lift characteristics and stability and controllability of low-altitude, low-speed and large angle of attack, and taking into account the supersonic speed. Sonic maneuverability and subsonic lift and drag characteristics.
So many design difficulties pose new challenges to the existing aerodynamic design foundation. We must use the current existing foundation and conditions to conduct in-depth research on new wing designs, tap the potential of forward-swept wing aerodynamic applications, and make trade-offs before we can achieve the goal. It is possible to achieve the design goals.
Second, the main design contradiction.
1. Compared with the fourth-generation fighter, the high-low detectability stealth design of the fifth-generation fighter brings new aerodynamic design difficulties. The frontal stealth performance puts new constraints on the nose and inlet type; lateral stealth and rear Moving towards stealth requires matching and adaptation between the fuselage cross-sectional shape and the vertical tail layout. The vertical tail, which is commonly found in conventional aerodynamic layout design and the J-20 fighter's comprehensive aerodynamic layout, is a huge radar reflection source and needs to be eliminated.
2. High maneuverability is manifested by maneuvering in the near-earth atmosphere, hypersonic cruise and supersonic maneuvering. The requirements for maneuverability taking into account sub-transonic and supersonic resistance are conflicting with each other based on the existing aerodynamic force and cannot be resolved, and in stall Finally, the stability and conventional flight control surface control rate declined, and new solutions must be found.
3. High range requires aircraft to have good internal load space, variable cycle adaptive engines and aviation fuel with higher combustion efficiency. The current smaller fourth-generation fighter designs are unable to meet the above requirements.
4. High intelligence is represented by the integration of several characteristics such as situational awareness, avionics systems, flight control systems and electronic warfare. The current mainstream fourth-generation fighter integrated avionics system can no longer meet the design requirements and needs to meet the requirements of flight control systems, integration Technology, large data volume transmission.
5. Use of directed energy weapons. Directed energy weapons mainly include three categories: laser, radio frequency and particle beam weapons...
