Chapter 1330 Dual -modal stamping engine
Xing Muchun and others were not particularly shocked by Chang Haonan's new idea.
I just simply find this concept a bit unfamiliar.
In the entire hypersonic weapons project, except for the bicone verification projectile initially used for technical verification and accumulation of experience, the boost-glide scheme with relatively low technical difficulty is given priority, while the progress of the air-breathing type is Relatively far back.
At present, the theoretical research and wind tunnel testing of the kiss cuttering of the flying body and the wind tunnel test, while the power system is still in a independent development stage-
Of course, it is only independent compared to the entire project team.
After all, in the final analysis, the Aerospace Power Group will still be responsible for the specific research and development tasks, and it cannot escape the hands of Academician Chang.
But until now, there is indeed room for changes.
Moreover, although the other main leaders of the hypersonic project all have aerospace background, aerospace and aerospace are not separated after all.
If nothing else, at least most people have heard that the Aerodynamics Group is pre-researching a variable-cycle fifth-generation aeroengine.
Therefore, it is logical to connect the two things:
"Pouring the engine ... Do you want to change the cycle?"
Xing Muchun has a background in overall rocket design. He is a bit unfamiliar with the technology tree of aspirating power, which is difficult to buy and buy, so he used an inaccurate way of describing it.
Fortunately, the meaning is pretty much the same.
"Your understanding should be right, but the concept of the stamping engine has no gas cycle and internal and external culverts, so it should not be called a variable cycle."
Chang Haonan corrected with a smile:
"Of course, if the ramjet engine and the traditional turbojet engine can be combined in the future, let's talk about it separately..."
Regarding the last half of the sentence, everyone unanimously chose to ignore it for the time being.
As for the age of most people here, the current project is almost the battle of their career, and it can be done in the front line to end.
No matter how long, even if they are willing to participate, the probability is not as the current identity.
"How should it be named?"
Xing Muchun is also serious at this moment.
Chang Haonan did not give an answer immediately, but just lowered his head and thought for a moment.
After seeing the work circulation curve that had been verified just now, the light appeared, and there was no complete idea at this moment.
"The most obvious difference between the super -combustion stamping engine and the sub -burning stamping engine is the thermal working process in the combustion room ... so it can be called a dual -modal stamping engine, which can be based on the flight status. Switch freely ... "
Everyone didn't say anything, but nodded in recognition.
"But Academician Chang..."
After some chat, Jiang Zonglin took the lead in cutting back the topic:
"After all, the variable cycle of jet engine requires only an extra culvert, which is within the scope of the acceptable range of engineering design ... This double-modal stamping engine is designed by the combustion room, including the compression-isolation section and the inner nozzle. If you want to change, you can't install two burning rooms inside? "
One of the biggest advantages of the ramjet engine is that it has a simple structure, does not have many moving parts, and has good tolerance to extreme flight conditions.
If there is an extra combustion chamber for compatibility, it would be better to install two engines independently on the aircraft.
A slightly joking smile appeared on Chang Haonan's face:
"Originally, this was indeed a problem that could hardly solve ... but thanks to the defeat of the Americans this time, it gave me a lot of inspiration."
He said that he quickly turned the report just to one of the pages, and then pulled a few white paper from the printer next to him.
The other people saw this and quickly gathered around.
"The two combustion rooms for the engine design are definitely not lost to the engine, but we can divide the same combustion room in thermalism through the distribution and boundary layers of different robbing skewers and the same combustion cone. Two ... "
Chang Haonan introduced a schematic diagram while introducing it, but by half, the pen Feng suddenly stagnated:
"No, we have to divide three working states."
"First of all, the mode of pure sub -burning. In this case, the front of the burning area in the streaming field is dominated by the front of the burning area. With two geometric larylasses, the positive wave system provides pressure provided by the diagonal excitement of the transposer. "
"Then the transitional modal, moved in front of the burning area to move towards the entrance of the burning room, the exit of the rim string to the ultrasonic speed, the boundaries of the boundary layer weakened, but it is still in the work cycle of sub -burning stamping." br>
Speaking of which, he turned around and pointed to the test conclusion of the test of the X51A flowway structure beside:
"Currently, Americans' understanding of the thermal cycle of ramjet engines is most likely still superficial. In order to improve work efficiency, they chose a relatively high starting speed, but it was not high enough to ignore the transition section, which instead caused the speed of sound in the combustion chamber to increase. The wall is more difficult to cross, and in the end, it is forced to stay in the arson mode for a long time, and it is stuck at this link.”
"The purpose of developing a dual-mode ramjet engine is to reduce the pressure in the rocket's boost stage and improve the flexibility of flight conditions, so the idea should be to induce and get through this stage as early as possible, preferably at Mach 5.0 below, otherwise as the gas dissociation effect becomes more and more obvious, it will be difficult to convert chemical energy into effective work, and it is likely to repeat their mistakes..."
"..."
In addition to Chang Haonan himself, Jiang Zonglin and Chen Hong are the most in-depth research on high-temperature gas dynamics, and they were also the first to react.
"As long as this stage is crossed, the inlet shock wave can penetrate the entire isolation section/combustion chamber, allowing the fluid in the combustion chamber to reach supersonic speed and completely enter the scramjet mode..."
"That's right."
Chang Haonan nodded:
"But there are other details to be solved...such as weakening the influence of the geometric double-throat structure on the pressure distribution of the transcendent ram mode, and how to transition from the diffuser oblique shock wave to the aircraft precursor oblique shock wave. These are what we The issue that should be focused on first at this stage will not delay the development progress of the boost-gliding configuration. ”
"Mathered below 5.0, can you also enter the state of super -burning stamping work?" So soon, someone worked.
"Hmm ... the threshold of Mach Matto 5.0 as the hypersonic speed is artificially defined. Actually, this number is related to many variables. The stream of the ropper string can ensure the normal work of the over -stamping mode. "
Chang Haonan explained:
"Of course, this requires calculating the thermal working process and corresponding performance of the combustion chamber when the outlet area of the isolation section reaches the ultimate back pressure condition, the required expansion ratio, the characteristic Mach number and the heat release distribution law before the design, and..."
"..."
"In short, it is a job that requires a lot of wind tunnels to complete."
He tapped the table lightly and entered the summary:
"The way is far away, comrades ..."
...
After briefly arranging the follow-up test work, Chang Haonan quickly compiled the test and analysis results of the X51A, and then quickly rushed to the Air Force Headquarters by car.
"Why are there so much?"
There is no mistake in every song, one post, one content, one 6 one, one book, one book, take a look!
It is almost a month before the return of the Long March 9 to the air. When Zheng Liangqun received the phone just now, he thought that Chang Haonan just told him some preliminary judgments, and even today's schedule did not change it specifically.
As a result, after opening the archive bag, I found that a thick conclusion report was contained in it.
"I remember you seem to have said before, maybe there is no way to get particularly rich conclusions?"
At a certain moment, he felt that he seemed to have a problem with the understanding of the word "rich".
"Mainly luck, the restoration of the compressed isolation section is very high, and it also analyzes some useful conclusions ..."
Chang Hao replied in the south.
Zheng Liangqun sat up straight and showed awe.gif.
"Wait a minute..."
Then he picked up the phone and quickly called a lieutenant:
"Ask Deputy Chief of Staff Lu to attend tonight's meeting on my behalf. Just tell me that there is an emergency here and I won't be able to get away for a while."
Such a decisive choice made Chang Haonan a bit difficult to stretch:
"This...is not good."
After the young officer left, he turned his head and looked at the door and said:
"The report is on you anyway, but I will not run away my own long legs ..."
Zheng Liangqun waves:
"A business that is in contact with local units. It is the political department that sings the protagonist.
Then put attention to the report in your hand.
Because it was written for leaders to read, Chang Haonan retained the data analysis while also not forgetting to write a section after each part with as concise sentences as possible.
Zheng Liangqun naturally did not have any obstacles.
"That is ..."
About half an hour later, he finally looked up again:
"Do you think that the current problem of the Americans is not just immaturity of individual technologies or defects in certain details, but a problem at the route level?"
Chang Haonan has found tea from Zheng Liangqun's office in a light car and soaked himself with a cup:
"More fundamental."
He put down the teacup in his hand and replied:
"According to the current situation, I don't think it's X51A. Even if they go to the gliding style, they will encounter big problems ..."
Zheng Liangqun's face showed surprise for a moment, but he quickly calmed down:
"Can it be solved by the flying generation test?"
"It's difficult."
Chang Haonan shakes his head:
"The premise of the flying test is that the cause of the fault is single, and it can determine the location of the problem, but if it is just a simple model selection error, then they should be realized during the ground testing stage that it will not let the aircraft take such a big problem Heaven, so there must be a lot of loopholes in the engineering management stage ... In this way, it is estimated that you can’t understand the analysis. "
"Actually, I can't even think about it now, how did the X43A success in that year ..."
(End of this chapter)