Chapter 1345 Don’t really get out the Nantianmen plan, right?
After hearing Chang Haonan's answer, Xing Muchun lowered his head and pondered for a while, then sighed softly:
"Okay... Today's era, and we did have already It's different."
The former will not completely deny the value of the other party's work:
"In the future reports, you can indeed continue to add this part... Compared to the finance side, you give me The summary of the use of simple funds should be interesting and comprehensive. ”
This sentence is not entirely intended to provide emotional value.
As the general manager of the project, Chang Haonan could no longer focus on technical matters like he did in his early years.
Organization, personnel, administration, funding...
Although each of these parts has its own dedicated person, it is impossible for him to be a hand-off manager.
Although it is also a chart plus numbers, for Chang Haonan, the wind tunnel test data and flow field calculation equations are simpler and easier to understand than the financial accounting status.
The statistical data provided by Xing Muchun certainly cannot replace the conclusions in any professional field, but at least it can add a perspective to look at the problem.
"..."
The two of them had a discussion on the current R&D progress for a while.
After that, Chang Haonan put the report aside and took out a few pages of A4 paper written in the drawer.
"One more thing."
He turned the pages into direction and put them aside in front of Xing Muchun: "Based on this month's research on the combined wave-river body, I have some new ideas at the theoretical level." br>
Almost as a conditioned reflex, Xing Muchun's upper body left the seat back.
However, I didn't go to read what Chang Haonan wrote on paper immediately.
He knew very well that even if he could understand it, it would not be possible in just a few minutes or hours.
So, the key is to listen to what the other party says.
Sure enough, Chang Haonan explained: "The proof part may be a bit complicated, but to sum up, the three-dimensional supersonic flow equation can be approximated by the axisymmetric flow equation within the second order accuracy range. As long as the axis of the axisymmetric flow is located in the tangent plane passing through the point flow line, the local three-dimensional flow can be described as a local two-dimensional axisymmetric flow. "
Even after a round of explanation, this part The content still looks a bit abstract.
Fortunately, in the past few years, Xing Muchun has also specially strengthened his theoretical level and at least captured the keywords.
"It means that the reference flow field on the tangent surface can no longer be limited to the same type of axisymmetric flow field, but can customize some of the detailed characteristics according to specific requirements...such as the sweep angle of the leading edge line, or on the lower surface Reverse angle or something? ”
If this is true, it will greatly liberate the freedom of design, and no longer be able to cut the shapes from different rotating bodies like in the past.
The significance of hypersonic aircraft design work is no less than that of directly entering the era of wing body fusion from Flyer One.
Chang Haonan nodded: "In fact, it can be more specific, and even determine part of the design process."
He organized the language a little bit and continued to add:
"The three-dimensional flow field is divided into several tangent planes through a given shock curve, and the flow within each tangent plane is only by that plane The specific tangent cone within is determined to maintain the equal shock angle of the conical flow in each tangent plane to ensure the same shock intensity and the expansion continuity of the flow field..."
"Each tangent The bottom radius of the cone can be different, and is determined by the radius of curvature and flow parameters of the shock wave curve: If the radius of curvature is a finite value, it is a three-dimensional conical flow, otherwise it is a two-dimensional wedge flow. This method can be customized according to The shock wave shape designs the reference flow field and wave-river shape..."
"..."
"..."
Compared with the pure mathematical parts on the paper just now, these are closer The content in the engineering field is obviously more in line with Xing Muchun's taste.
Although it is impossible for two people holding paper and pen to really replace supercomputers, it is still no problem to give some qualitative analytical conclusions through experience.
After listening to Chang Haonan's explanation, he quickly realized: "In terms of our design, we design the curvature of the shock wave line in the cross-section of the lip, through designing the curvature of the lip cross-section shock wave line Continuous change along the expansion direction can realize the continuous transition of the tangent plane reference flow field from the inner contraction shock reference flow field to the outer compression shock reference flow field... Ideally, it can even make the precursor The outside compresses the shock wave surface and the inside contracts the shock wave surface..." However, halfway through the analysis, his voice became smaller and smaller, and finally stopped completely.
Xing Muchun stretched out her hand and gestured on the table for a while before she raised her head again and said in a somewhat uncertain tone:
"But the combined wave multiplication body designed in this way seems to be closer to a... parallel structure?"
"It can only be said that in form, it is closer to two wave multiplication bodies in parallel."
>Chang Haonan briefly drew a schematic diagram on the paper: "But if it really needs to be strictly classified, it is still another way to say whether this plan can be considered a combined wave multiplication body."
Xing Muchun stared at the content on the paper for a while:
"Indeed, it was designed as a whole after all, and it looked even more than our current plan..."
He thought about it for a long time but still couldn't find a proper adjective.
But Chang Haonan did not have these concerns and directly filled in the blanks:
"More coordinated."
This is indeed nothing to say.
Compared with the current solution that connects high-speed wave-river body and low-speed wave-river body through a transition section, the concept diagram on paper is obviously more in line with the concept of "aircraft" in normal people's understanding.
No mistakes, one poem, one post, one content, one in 6, one book, one bar, one read! "Yes." Xing Muchun also expressed his agreement with this.
But then it seemed like something came to mind:
"Can you...you need to change our design plan?"
The tone was full of horror.
This is just a short shot. If you have to change it again, it is really a bit unbearable.
"Don't worry."
Chang Haonan quickly waved his hand and comforted him:
"First of all, there is no greater change in our current stage. Secondly, the biggest difficulty of hypersonic flight control lies in longitudinal stability control. The current series combination solution is the best static stability among all designs. Other concepts have to wait until the test is over before they can be formally included in the consideration. "
Xing Muchun finally breathed a sigh of relief when he heard this: "Huh... …That’s good.”
In fact, there is another reason why the former did not say it directly.
It is the greatest significance of this tangent flow field design lies not in the upper surface and outer contour, but in the flexibly customized lower surface, that is, the compression surface.
In other words, the ability to uniformly compress airflow will most likely no longer be exclusive to the kiss-cutting cone wave-multiple body.
If the tangent cone wave multiplier can be integrated with the inner retracted air intake on both sides through geometric fusion, an almost consistent inflow compression effect can be achieved, providing sufficient scramjet engines Air intake conditions.
And there is a higher cruising lift-to-drag ratio, which fully meets most of the needs of an aircraft.
The only disadvantage is that the internal volume, which is not rich, is further compressed, and after the arrangement of passenger/cargo holds and various control systems, the part that can still be left for fuel is probably very limited.
Fortunately, the aircraft near the space itself also uses jumping tracks to fly at the edge of the atmosphere. The engine only needs to work in a short period of time within the appropriate range, so it does not need to carry a large amount of fuel to achieve long-term high-speed flight.
In fact, the definition of the final product is very close to the "White Emperor" aerospace fighter in the science fiction universe in the previous life -
Although it cannot really enter space, it can move at suborbital altitude for a long time. And achieve independent takeoff and landing.
Chang Haonan certainly knew that there was no such project in his previous life at least until he was reborn.
But because of this, it is inevitable to make some associations:
"This Nantianmen plan will not really be made up by me..."
" >
(This chapter ends)