The biggest problem in the development of the pump swing liquid engine by the Aerospace Corporation is still an engineering and technical problem, mainly because it cannot solve the problem of hoses and high-power turbopump technology that can withstand high pressure and high temperature.

For rockets, a powerful engine is the core guarantee for it to get rid of gravity and rush into space, liquid rocket engines are generally composed of thrust chambers, propellant supply systems, and engine control systems.

The thrust chamber is composed of a propellant nozzle, a combustion chamber, a nozzle assembly, etc., and the propellant is injected into the combustion chamber through the injector, and the combustion products are generated through the processes of atomization, evaporation, mixing and combustion, and the thrust is generated by flushing out of the nozzle at a speed of 2500 to 5000 per second.

Among them, the pressure in the combustion chamber can reach 20 megapascals, even the pressure in the combustion chamber of an ordinary rocket engine can reach about 8 megapascals, and the famous former Soviet RD-180 engine has a combustion chamber pressure of up to 25 megapascals!

The higher the pressure in the combustion chamber, the better the performance is usually the same, and the Soviet Union took its alloy technology to the extreme, raising the pressure of the rocket combustion chamber to such a terrifying level, which is why even the United States has been purchasing high-thrust rocket engines from Russia until now.

With such a huge pressure in the combustion chamber, an extremely difficult question arises - how does the propellant get in?

In order to fly in a vacuum, the rocket has its own fuel and oxidizer, they are stored in the tank, it can be said that 90% of the weight of a rocket is propellant, if you want to let the propellant into the high-pressure combustion chamber, the most direct way is to let the pressure of the propellant be greater than the pressure in the combustion chamber.

If you choose to improve the structural strength of the tank, the new weight is an unacceptable number, so the high-thrust engine is used to pump the supply system, the core of this system is a high-power turbo pump.

The turbo pump is composed of two parts, divided into the turbine part and the pump part, which is generally directly connected, and the turbo drives the pump to pressurize the oxidizer and fuel.

Its working principle is similar to that of the turbocharger of the automobile, which uses the gas to drive the turbine to rotate and drive the pump to work, pressurize the low-pressure propellant in the rocket tank, and deliver it to the gas generator and thrust chamber for combustion in real time.

The engine is called the heart of the rocket, and the turbopump is the heart of the rocket engine, the core of the core components, and the way it works is extremely violent-

The liquid rocket engine works for a few minutes, hundreds of tons of fuel will be consumed, and the power of the turbopump is very large, if it is a water pump, its output pressure can hit the water on the sea surface to an altitude of 5,000 meters!

The turbo pump is a high-speed rotating component in the liquid rocket engine, and it is also the only high-speed rotating machinery in the important assembly of the engine.

Huaxia is also able to design a high-performance turbine pump, but the material technology is not up to par, in the turbine pump bearings, seals, turbine blades, high-performance induction wheel each part is the highest requirements of materials and processing technology at this stage, a component does not meet the standard turbine pump performance will be greatly reduced.

Only the Soviet Union exerted all its strength to achieve the ultimate in alloy technology and successfully developed the highest efficiency turbine pump, which is also the Soviet Union's housekeeping skill.

In the 90s, Huaxia introduced the RD-120 engine from the Soviet Union Space Agency, which is a rocket engine developed by the Soviet Union in the seventies of power machinery manufacturing research, with a vacuum thrust of 84.7 tons, which was also a relatively high-end achievement in the world at that time, and this rocket engine was also used in the rocket of the Sea Launch Company, and was used in the second stage of the "Zenith".

Subsequently, Xi'an Machinery Factory made preparations for nearly a year and began to imitate the Soviet Union's liquid oxygen kerosene engine, not only introducing machines from the Soviet Union at that time, but also introducing more technical problems, and understanding the process equipment and technical problems of Soviet manufacturers.

On the basis of this engine, a YF-100 engine was also designed in China, with a design index of 120 tons, and it was not until 2000 that the technology in this area was fully mastered by the RD-120.

However, in the mid-eighties, the Soviet Union successfully developed the RD-170 engine, which has the world's largest thrust, and the purpose of this engine was to support the launch of the Buran space shuttle, in order to achieve a perverted thrust of 1,500 tons, the Soviet Union designed a four-nozzle four-combustion chamber rocket engine, which is also known as the "devil's design rocket engine".

The subsequent RD-180 is a rocket engine with a twin nozzle and a single turbine pump with two combustion chambers, which is a reduced size RD-170, which was developed in the mid-eighties, and now this engine has begun to be put into practical use, and the RD-180, which has a thrust of more than 380 tons, weighs only 5 and a half tons, which is an outstanding subversion of rocket engines.

The RD-180 engine is Russia's powerful rocket power, originally used in the first stage of the Soviet Union's Energia rocket, but in 1996, it became the first stage of the Loma Cosmos rocket, and now the United States has been purchasing this engine from Russia, each engine has reached 10 million US dollars, which is cheaper than aero engines, and the factory that produces RD-180 engines has turned a profit.

Now the YF100 technology improved on the basis of RD-120 is almost mature, a few years ago it was also based on this to develop pump swing engine technology, the design of the engine is not a big problem for the chief designer of Ban Zhinong, the difficulty is the design of the turbine pump and the hose that can withstand high pressure and high temperature.

The Soviets designed a staged combustion chamber, the pre-combustion chamber rich combustion produces high temperature and high pressure gas can reach 3000 to 5000 degrees, these combustibles drive the turbopump through the pipeline next to it, and then generate a higher pressure to inject into the main combustion chamber for re-ignition, because the Soviets designed the pump swing liquid rocket engine to swing, so these pipes are hoses, this technology is currently not even the Americans can do.

Over the years, the factories and scientific research institutions under the aerospace group have been developing these core components, but where is the formula of the material industry so easy to find out?

However, Yonghan Aviation Technology Co., Ltd. and Machine Tool Research Institute, which are subsidiaries of Huaxing Group, have continuously carried out various research on superalloy materials and combustion chamber technology over the years, especially in superalloy materials, which have made very big breakthroughs, but this is the core secret of Yonghan Aviation Technology Co., Ltd. and has not applied for any technical patents.

At the time of the rocket engine production line, Ban Zhinong excitedly introduced to Yang Jie and others in detail the injection disc of a rocket engine that had been processed.

"Yang Shao, Song Dong, Yang Dong, 18 holes are drilled in the center of this injector to inject hydrogen oil, and 18 holes in groups of two and two are seen outside, which are used to inject liquid oxygen, and each circle of holes in the injection disc is alternately arranged with hydrogen oil injection holes and liquid oxygen injection holes. After more than 2,000 tests in the combustion chamber, we were able to figure out the size of the holes and the distance and proportion between each turn. ”

Ban Zhinong said: "This injector was designed by the technical team of Yonghan Aviation Technology Company, and we have conducted hundreds of experiments in the combustion chamber laboratory, and the mixed concentration of hydrogen oil and liquid oxygen in the injector has achieved the best effect. ”

Because it is a staged combustion, the concentration of the mixture of hydrogen oil and liquid oxygen in the pre-combustion chamber and the main combustion chamber is different, and the distribution of the injection hole of the injector is naturally different.

The design of these two injectors, turbopumps and hoses is participated in by the design team led by Konstantin, this technical team has been very mature in the design and development of aero engines, and has cultivated two very talented talents in this area, and now these two designers have their own technical teams in the design and development of different types of engines, and there is competition between each other.

After Ban Zhinong joined the company, he came into contact with Yonghan Aviation Technology Co., Ltd., and only then did he realize the amazing technical strength of Yonghan Aviation Technology Co., Ltd. in aerodynamic layout, combustion chamber technology, and research and development of superalloy materials!

The machine tool research institute and the instrument equipment company in the high-precision processing equipment and technology level is at the world-class level, what kind of special processing equipment and testing equipment companies need in the factory are able to provide, there is no need to import high-end experimental equipment from abroad.

It is precisely with such strong technology and equipment support that Ban Zhinong feels extremely good in rocket research and development.