The old leader was looking at the documents in the office when the secretary walked in.

"Li Youhong, the division commander of the leading military region, called and said that there was something important to report."

The old chief put down the documents in his hand, and wondered in his heart that Xiao Yao should have only arrived at the Military Region Research Institute for two days, and it was impossible for them to have such a fast research speed.

"Transfer the call."

The old leader responded

"The chief, Professor Xiao Yao, proposed to develop a new engine, saying that the fighter engine we purchased from Eagle Sauce is the engine before World War II, and it may not be able to meet your expectations now."

After the phone was connected, Division Commander Li simply and clearly said Xiao Yao's suggestion, the development of a new engine had to be ordered by the old leader himself, and he could not call the shots.

"You give Xiao Yao the phone and I'll tell him."

The old leader wanted to hear Xiao Yao's advice, and he had questions to ask him.

"Hello leader, I'm Xiao Yao."

Xiao Yao was next to Master Li.

"Xiao Yao, I wonder if this engine has other uses, can't we use this batch of planes in exchange?"

The old leader was puzzled, the first plane had an accident in the middle of the flight when the plane was just handed over to the military, and the other planes were found to be engine problems under the inspection of professionals, although it did not affect the flight mission, but the old leader wanted to improve the fighter plane, and could take off and complete the task with confidence.

"There are also uses for leading these aircraft engines, such as being improved and can be used on transport aircraft, but as a fighter engine, the kinetic energy is not enough at all, and if the transport aircraft is used with civil aircraft, this engine is very durable and advanced, but as a fighter, its kinetic energy is not enough, and the speed in the air represents everything."

Xiao Yao put forward his own opinion, not that this engine is useless, this engine can still appear on the transport plane in another fifty years, after all, it is fuel-efficient and the flight speed is enough.

"Okay, good, or your analysis is more professional, I understand this layman, now I have two requirements, the first you are developing a new engine at the same time to find a way to improve this engine, we are relatively backward in the field of air transportation, since there is a ready-made technology of course to make use of it, the second is to develop a new engine as soon as possible, I am waiting to celebrate for you, you call Comrade Li Youhong."

The old leader said happily

Division Commander Li took the phone

"Comrade Youhong's military region materials give priority to Xiao Yao's team, and the design of the fighter will be delayed first, and everything will be said after the engine is successfully developed."

Master Li nodded, and hung up the phone after standing upright.

Xiao Yao returned to the research room after receiving a clear answer.

"Now that we have received a clear answer to allow us to develop a new engine, I have studied the engine information and thought of an ideal engine, for the time being we call it a turboramjet engine, the idea of this engine is a propulsion device that combines the two engines, turbo and ramjet, and the two engines share the air intake tract and tail nozzle.

When a turbo core and a ramjet engine are combined in different ways, the corresponding combined engine has a different maximum operating Mach.

With the increase of flight speed, the efficiency of the compressor and the turbine decreases sharply, at this time, the compressor is in the state of the propeller or windmill, and the ramjet combustion chamber can continue to work alone, the maximum flight Mach number can be expanded to 4200 kilometers per hour, due to the limitation of the material performance of the turbine and the compressor blades, the turbine core engine needs to be closed, so that the air flow enters the ramjet combustion chamber through the bypass, in order to reduce the aerodynamic resistance, the turbine and the ramjet channel should adopt a coaxial series layout. ”

Xiao Yao explained while drawing out the picture, now this engine sketch is presented in front of everyone, at present only put forward the theory and direction, now it is necessary to divide the division of labor to the important components of the research and development.

Lin Siyue's task is to increase the intercooling and reheating process on the basis of the thermal cycle of the turbofan engine, the recuperator is a major characteristic component of the intercooling reheating turbofan engine, and the fighter will produce a high-temperature core flow of more than 900K when working, and its performance will directly affect the performance of the engine, among which the intercooling reheating turbofan is a key technology.

Xu Wenxin and Wu Rui are responsible for improving some of the previous precision machine tests, and every step of the engine is made with high precision, and one of the errors will affect the use of the entire engine.

As soon as the task was assigned, Su Man went to the laboratory and asked everyone to eat first, and everyone was still hungry from yesterday to now.

Everyone is looking at the assigned task materials in their hands, and they are reading through them during meals, and they must remember these data and principles in the shortest possible time.

Wang Yutong calculated the corresponding data at the first time and nodded, as long as everyone works hard in this area, it can be achieved, Xiao Yao's 4200 km engine per hour.

In the shortest possible time, Lin Siyue found how to make the most reasonable high-pass axial compressor, usually called a fan, because it is similar in form and function.

At high free-flow Mach numbers, such as greater than 4, the pressure ratio of the fan is no longer required for thermal efficiency, but its viability is threatened by the high stagnation temperature of the air being trapped. So if this type of engine is to be used in even higher Mach number situations, it must be prepared to remove or retract the fan from the mainstream.

A turbine driven by a high-temperature, high-pressure gas produced by a separate combustion chamber that provides the power required by the fan and its intake conditions are independent of the flight condition.

Here the turbine airflow is called the original airflow, and the fan and turbine require the front part of the engine to be axisymmetric rather than two-dimensional, which will complicate the integration of the aircraft.

The mixer agitates the air stream with the original air stream, which increases the total temperature of the air stream and sends the unreacted fuel to the whole air stream for combustion.

The raw gas stream can be rigidly designed to be fuel-rich and can provide hot gaseous fuel for easy combustion with air.

And it can be kept at a safe temperature.

A month has passed, only Lin Siyue's side has made the fastest progress, and the physical test has begun after the research is over.

The new fan and turbo are installed on the body of the old engine and turned up to maximum horsepower to check whether it meets the safe temperature of the new engine.

These two things must be qualified at only one-third of the expected temperature on an older engine, which has less than one-third of the kinetic energy.

When the fuel was burned, the temperature did not reach one-fifth of the expected temperature, and Lin Siyue clenched her fists and made a triumphant gesture.

Her task has been completed, and the rest depends on Xiao Yao's progress on their side.

Lin Siyue's research was successful, and the others did not lag behind for a few days, and the new engine was secretly assembled for the final assembly.

Xiao Yao nervously transported it to the laboratory for the final test.

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