In the north in the morning in March, the temperature is still a bit cold.
The wind blew gently.
"Zhou Hai, have you remembered all the information I gave you yesterday?" Yang Xiaolong stood in front of the flight simulation room with a calm face and asked Zhou Hai.
Zhou Hai held an introduction to the technical performance of the L-15C Falcon in his hand and reported: "Teacher Liu, remember."
"That's good. Practice today and report to the crash course in the afternoon. My teaching method is the same as the old squad leader. Theory and practice are carried out simultaneously. Your talent is very good. In three days, you will be tested on flight simulation and aviation theory." Instructor Yang Xiaolong heard this. , responded: "Give me the information, what is the ceiling of the L-15C Falcon?"
Handing the information to Yang Xiaolong, Zhou Hai looked calm and replied: "Seventeen thousand meters."
"What are the maximum controllable angle of attack and instantaneous hovering angle?" Yang Xiaolong nodded and continued to ask.
"32° and 22°."
"What is the three-axis four-redundancy fly-by-wire digital flight control system?"
"This is an advanced electronic flight control system based on electrical signals as its core. It consists of sensor groups, various gyroscopes, accelerometers and other inertial measurement devices, angle-of-attack sensors, input devices, flight control computers, steering gears and electrical It is composed of transmission lines, which is a telex control system in the popular sense."
Zhou Hai's voice was calm and he slowly defined the entire telex system: "The so-called three axes refer to the longitudinal axis, roll axis and yaw axis, and the four redundancies refer to three digital channels and one backup simulation channel. Using computer control."
Yang Xiaolong nodded with satisfaction: "What is the empty weight of the L-15C Falcon?"
"5,800 kilograms." Zhou Hai replied.
"How much better is the flight performance of the L-15C than the B model?"
"The overall flight performance is improved by 8%."
"What are the maximum available overload and the maximum limit overload of the L-15C? What impact will exceeding the maximum limit overload have on the body?"
"7 The impact is damage to the load-bearing structure of the aircraft, eventually leading to disintegration in the air."
"Last question, what is the basis for the existence of modern jet aircraft?"
"Classical mechanics of physics is based on Newton's third law - the action and reaction forces between two interacting objects are always equal in magnitude, opposite in direction, and act on the same straight line."
After the test, Yang Xiaolong became increasingly satisfied and said to Zhou Hai, "Okay, come in with me."
After saying that, he turned around and moved forward.
Zhou Hai followed closely, followed Yang Xiaolong into the flight simulation room, entered the building that was unprepossessing but guarded by two air force soldiers, went up the stairs, came to the second floor, and entered room one.
The entire room covers an area of about 300 square meters. The floor is clean and tidy, and the lights are bright. There are four six-degree-of-freedom flight simulators. Each machine is painted in white, with a clean surface and reflects white energy-saving lights.
On the right side of the room is the console. A second lieutenant officer is sitting in front of the stage and is in charge of the console.
Zhou Hai stood in the center of the room and looked around, looking left and right. From the appearance point of view, the flight simulators in Shicheng Flying Academy were quite different from those in the sky. Each simulator was equipped with a drop-shaped glass cockpit, which highly simulated the configuration of a real fighter jet.
"Let's go up, Simulator No. 1." Yang Xiaolong gestured to the second lieutenant officer in charge of the console, and then gestured to Zhou Hai.
"OK."
Zhou Hai responded, came under the No. 1 flight simulator, climbed up the escalator skillfully and easily, and entered the front seat of the drop-shaped glass cockpit.
Yang Xiaolong followed, stood next to the simulator, and introduced to Zhou Hai: "This is the latest flight simulator. The avionics system and fly-by-wire control system are the same as the L-15c. It is highly simulated. We have been in contact all morning. Report to class in the afternoon and learn theory. We first learn how to start the engine."
Sitting on the flight seat, Zhou Hai looked curious and listened quietly.
"Jet engines are different from piston engines in the propeller era. Its starting characteristics and principles require air flow first, and then ignition and combustion, that is, the engine must rotate first and then start. However, this creates a contradiction. The engine has not started yet. There is no ignition, but it needs to be turned first.”
Yang Xiaolong's voice was calm and he slowly explained: "Such starting characteristics and principles determine that aviation turbofan engines cannot ignite and start independently like car engines. Zhou Hai, what consequences do you think it will have if it starts like an engine? "
"It will burn the combustion chamber and turbine guide blades, and damage the engine." After hearing these words, Zhou Hai's knowledge about aero engines naturally emerged in his mind, and he replied.
"Why?" Yang Xiaolong smiled.
"In a stationary state, fuel is directly supplied to the engine for ignition. Since the compressor is not rotating, the inhaled air has no pressure, and the high-temperature gas cannot flow backwards and be ejected, thereby making it impossible for the turbine blades to rotate." Zhou Hai did not pause at all, and slowly The principle is revealed.
"Yes, it is precisely because of this starting characteristic and structural characteristics that we generally use other auxiliary power to drive the main engine to rotate before the pre-ignition and combustion steps."
Yang Xiaolong nodded and continued to explain: "The mainstream method now is power start. The ground provides a high-power power supply car and a high-power engine to drive the main engine turbine to rotate. The pilot then presses the start button to make the engine enter idle and maintain stability. Working status. However, in an emergency, it can also be started by the onboard battery. Have you noted it down?"
"Remember it." Zhou Hai nodded and responded with a sincere attitude.
Although, Zhou Hai had already understood the starting process of aviation turbofan engines and recorded all this important knowledge in his mind.
"Okay, we have explained the general situation. Next, you control the simulator to demonstrate the process of starting the aircraft to the pre-takeoff state." After Yang Xiaolong explained, his mouth was a little dry, and he gave new instructions.
"Ta!" The crisp sound of a switch being pulled sounded.
Zhou Hai's expression was calm, his dexterous hands jumped and danced, and he skillfully turned on the main power switch. The 'EZVIZ' onboard avionics system started to operate. The head-up display and two multi-function displays in front were powered on and activated, and the dark screen glowed.
Skilled and fast, as if it had been done countless times.
Immediately after, turn on the engine power supply switch, press the engine start button, and then the onboard battery supplies power to the right engine. After a few seconds, the multi-function display on the right gives the engine parameters and displays the simulated turbine blade rotation.
Zhou Hai didn't panic, turned on the fuel supply switch, and connected the fuel supply pipeline.
"Beep!" Fifteen seconds later, the multi-function display on the right gave a prompt that the engine started successfully.
After successfully simulating starting the right engine, Zhou Hai immediately followed the example and accurately copied the previous operation process, supplying power to the left engine, driving the turbine blades to rotate, and reaching a stable working state of idle.
"Beep!" The prompt sound of the left engine successfully starting sounded.
The entire startup process took Zhou Hai about forty seconds.
