Siheyuan: I eat melons while doing scientific research

Chapter 1187 Comrade Consultant is keeping it secret (two more chapters tonight)

Comrades from the Institute of Guidance and Research have been dealing with Gao Zhendong for a long time. It can even be said that the consultant of the Institute of Guidance and Research was the first technical advisory work that Gao Zhendong undertook outside the system.

When Gao Zhendong heard the chief designer of the long-range air-to-air missile model of the Missile Research Institute call him by this title, he also felt very cordial.

"Well, I'm ready. Come on, if everyone is ready, shall we start now?"

Gao Zhendong was also very straightforward. It was too early for this matter. The sooner the comrades learned the knowledge of dual pulse, the sooner they could achieve results in this area. This thing is not just as simple as facing air-to-air missiles.

The chief designer of the long-range missile and the person in charge of the rocket engine subsystem nodded happily: "Ready!"

Although comrades from several subsystems were present, the protagonist this time was undoubtedly the rocket engine.

"Well, okay, then let's start with the basic design principles of the pulse engine..."

Gao Zhendong did not talk about the technical details right away. This time he invested a lot of money and found several papers, one of which was the basis.

Instead, the principles and advantages of the multi-pulse engine are introduced to comrades in detail here.

"...Comrades, you should be able to see from what I just said that multi-pulse rocket engines do not make any additional contribution to the thrust and specific impulse of the engine. In fact, due to the actual structural occupancy, weight cost, jet flow field changes and other reasons, multi-pulse engines will even deteriorate the above performance of the rocket engine to a certain extent."

The comrades nodded one after another. They could actually calculate this point: energy is conserved.

"...But the advantage of this engine is that it can manage the energy output process of the rocket engine to a certain extent, allowing us to use the charge in our engine as much as possible in the most appropriate way..."

With this conclusion, we will not go astray in the most basic energy management and calculation.

"...The dual-pulse engine is a special compromise of the multi-pulse rocket engine. This solution can relatively effectively utilize the energy of the rocket engine without causing too many problems in terms of structure, difficulty, weight, volume, complexity, etc."

This kind of compromise is very common in engineering applications, and comrades all understand it.

"... Let me draw a conclusion here. Under high-altitude conditions, the dual-pulse engine will reduce the missile's maximum speed and terminal speed, but it has almost no effect on the missile's average speed. Under medium and low-altitude conditions, it can effectively increase the missile's terminal speed..."

The comrade in charge of the rocket engine was puzzled: "If the terminal velocity of the missile is reduced at high altitude, then wouldn't it affect the performance of the missile?"

Gao Zhendong shook his head: "The speed of high-altitude missiles is already high, so a little impact is not a big problem. Moreover, we can choose the appropriate pulse ratio and pulse interval to reduce this impact. Relatively speaking, the increase in the terminal velocity of missiles obtained at medium and low altitudes becomes particularly important. A considerable part of air combat occurs at medium and low altitudes, and the maneuverability of high-altitude aircraft is actually relatively poor. In high-altitude combat, the demand for missile performance is not as strong as in medium and low altitudes. Here, we still have to weigh the overall combat needs."

The comrade from the Institute of Guidance and Research nodded. Performance is like that. How to weigh the pros and cons is really a science.

Gao Zhendong went on to say: "As for how I came to this conclusion, it was mainly through computer simulation. Here is a result of my simulation. You can take a look. In fact, there are some discrepancies, but in terms of trends, the impact should not be significant."

The comrades took it and looked at it, and were shocked to see a line of non-pulse traditional hair growth parameters.

The simulated range of this non-pulse conventional fixed-fire missile is as high as 145 kilometers.

Consultant Gao's requirements are too high, starting at 145 kilometers. Although I know that simulation and reality are not completely consistent, this is too high. I dare not compare, I dare not compare.

Gao Zhendong had no choice because the data in the paper originally appeared there.

In fact, even after the "Tianya Six to Zero" incident, many military fans who participated in the discussion and even the media from various countries were unaware of a "small matter".

That is, among the few papers on dual-pulse solid rocket engines published in China, one of them is a traditional solid rocket engine used for comparison and reference, and its range is 145 kilometers. Gao Zhendong happened to have this paper in his hand at this time.

145km, does this range sound familiar?

Gao Zhendong dares to say that perhaps all the data in those papers are "desensitized" data, but this data does not look like desensitized data.

Because what we wrote on the display board was this range, and this data is not confidential at all.

So someone once mentioned very obscurely after the 6-0 incident: "What if, what if the air-to-air missiles used by the minibus are not dual-pulse?" In the overly obscure context, other military fans laughed at him for fun.

Of course, Gao Zhendong, as a poor senior military fan in his previous life, didn’t know the specifics, and he didn’t dare to ask.

Anyway, his current task is to get his comrades to get this thing out as soon as possible.

A hot piece of knowledge is that, in fact, judging from public documents, both Citigroup and Hans have dual-pulse engines, but those missiles are large missiles with larger diameters, or they may not be actually put into use. As for why Citigroup's air-to-air missiles are not that good, Gao Zhendong estimates that it has something to do with Mr. Smith.

Of course, the thinner the missile, the more difficult it is to make this thing. No matter what he thought, his comrades looked at his "simulation" results with great interest.

"Well, look at this curve. The altitude really has no effect on the average speed..."

"The average speed at low and medium altitudes is affected to a certain extent by the increase in pulse interval, but it is very small."

"The terminal velocity of this missile is still interesting. It decreases by about 15% at high altitudes and increases by about 15% at medium and low altitudes."

"It's true that the 15% at low altitudes is more important than the 15% at high altitudes."

"The range is actually a wave curve. It seems that the pulse interval is not as large as possible."

"That's for sure. Due to the existence of air resistance, restarting the engine at a certain speed can save the secondary acceleration process of overcoming air resistance. However, this effect will be delayed as the air resistance increases..."

Although they were not as thoughtful as Gao Zhendong at the beginning, when Gao Zhendong presented the results, the comrades quickly grasped the knowledge that Gao Zhendong wanted to express based on their own professional knowledge.

"Comrades, you can see that if you want to pursue the best range increment, the missile's pulse interval should be between 35 seconds and 40 seconds. In this case, the range is maximized, but the loss of high-altitude terminal speed and low-altitude average speed will not exceed 6%. It has little effect on the basic performance of the missile, but it greatly improves the terminal maneuverability."

Even though the terminal speed of a non-pulse engine may be a little higher, the contribution to maneuverability of an engine that has "not a drop left" and an engine that is still spraying is a world of difference.

For the Institute of Advanced Technology, this was a gain they never expected. At this point, they almost forgot that they originally wanted to develop a dual-pulse engine just to improve terminal maneuverability.

Now it seems that the shooting range can be improved to a considerable extent, which is a pleasant surprise.

They even wondered in their minds whether the senior advisor's last proposal to increase the range of long-range missiles to more than 80 kilometers was a bit conservative.

They have now obtained a new type of propellant called HTPB, which alone can safely increase the range of long-range missiles to three digits!

Plus the range bonus of double pulse, hehehehe...

The comrades in the Institute of Guidance and Research almost laughed themselves into idiots.

Moreover, according to the news from the Defense Work Committee, this thing was also created by the senior consultant.

Hi hi hi, this is so embarrassing, it's like visiting a house and you have to eat and take things.

"Comrades, now that we have a basic understanding of the dual-pulse engine, what do you think is the most troublesome part?"

As soon as Gao Zhendong raised this open-ended question, it instantly ignited the comrades' enthusiasm for discussion.

"I think it's the ignition control. The timing has to be mastered, and this will most likely require the use of an internal ignition, which will still bring a lot of engineering troubles..."

"No, no, no, I think it's the nozzle design. The existence of the pulse ratio and the different average thrusts will make it difficult for one nozzle to meet the two thrusts..."

"Isn't it the calculation of the charge combustion process? It involves initial combustion, combustion surface, charge form, charge shape, there are many things to do..."

The comrades discussed enthusiastically, but they all overlooked the most important and troublesome thing. After all, that thing is a real bottleneck when you first think about it.

Seeing that everyone had almost finished their discussion, Gao Zhendong raised his hand and said, "You are all right, but there is still one problem that we need to solve first."

After hearing Gao Zhendong's words, the comrades knew that they must have overlooked something important, and they all looked at Gao Zhendong.

Gao Zhendong pointed at the rocket engine terminal on the schematic diagram of the dual-pulse missile that he had just drawn on the blackboard: "Here! Pulse isolation device!"

Gao Zhendong's words initially puzzled his comrades. What's so difficult about that?
"Advisor Gao, this place should be easy to deal with. We can just plug it with a flame retardant plug." The comrade in charge of the rocket engine said with a smile.

Gao Zhendong nodded: "Well, theoretically it is true, but it is easy to put this thing in, how do you get it out?"

How to get it out? No need to do anything, just burn it...

Just as he thought of this, the comrade froze in silence with a "quack" sound, like a duck with its neck strangled.

Burn your ass! This thing is there for flame retardancy! It can't be ordinary flame retardant material, it has to be ablation-resistant and heat-insulating.

(End of this chapter)