Chapter 47 The Theory of Cavitation Weapons

Monster, oh monster! Everyone tried to find the answer on Director Zhang's face, but found that he also looked embarrassed.

Fan Wubing smiled and said to everyone, "It's not my fault that I'm young, but if I say that I can't make achievements in science because of my young age, that's deceitful talk! Let me introduce myself solemnly again, my name is Fan Wubing is a model Fan, if he is disease-free, he has no problems! A person who has no problems is almost a saint!"

Hearing Fan Wubing's commotion, the people sitting below all laughed. They didn't expect this kid to be very interesting. It's just that a high-end weapon like Blizzard shouldn't be made by a kid, right? If a three-year-old can do this, then how do we old guys who have spent a lifetime studying cutting-edge weapons deal with themselves?

Director Zhang introduced to Fan Wubing, "This is Mr. Sun, an expert in fluid mechanics, this is Mr. Bo, an expert in aerodynamics, and this is Mr. Wang, an expert on rockets. Time is limited, and there are many others that I will not list one by one." introduced."

"I've heard of everyone's names for a long time, it's really thunderous." Fan Wubing said sincerely, cupping his hands.

This is not his posturing, but the names of these people. In later generations, he sounds like all of them are shining golden. Even if he was killed, he would never have thought that he would answer these people's questions.

Sun Lao, an expert in fluid mechanics, frowned and looked at Fan Wubing who was smiling, and asked Director Zhang, somewhat dumbfounded, "Xiao Zhang, are you sure that this three-year-old child is the designer of the blizzard? Don't fool me, you know My heart is not very good either!"

Director Zhang nodded, speechless.

Fan Wubing corrected him solemnly, "First of all, let me declare that I am no longer a three-year-old child, I am three and a half years old."

Elder Sun curled his lips and said, "You kid doesn't speak authentically, you run the train with your mouth! Our names have never appeared in public newspapers and magazines. How could you have heard of our names? You are not an honest kid. !"

Everyone nodded in agreement, not because they were bullying children, but because they wanted to see if the child in front of them really had the ability to design a blizzard, which was the most important thing.

"Mr. Sun is serious—you take it seriously—to be polite—" Fan Wubing said with a smile, "But to be honest, although I have never met you, or even heard of your names, but in my heart , I have been friends with you for a long time!"

Seeing the looks of the people who were either thoughtful or disbelieving, Fan Wubing went on to say, "We are both scientific and technological people for the country, so why should we be in a different order when we hear about it? If we are not full of blood for the country, how can we get together?"

"Well said, now I kind of believe that you are the designer of Blizzard." Old Sun looked at Fan Wubing in surprise and applauded.

"Now that everyone has formed a preliminary consensus, can we start?" Director Zhang heard by chance.

Everyone nodded, Fan Wubing saw that everyone was embarrassed to ask the first question, so he took the initiative to say, "Anyway, no matter which senior asks the question, I will explain it. Why don't I explain the principle of cavitation weapons first?" Let's do it."

Several leading experts nodded in agreement, so Fan Wubing sorted out his thoughts and began his first public speech in his life.

"If you want to talk about blizzard torpedoes, you have to mention the phenomenon of supercavitation." Fan Wubing said to everyone.

When the liquid moves quickly around the object, the pressure will drop, and as the speed increases, when the liquid pressure is equal to the water vapor pressure, the liquid will change from the water phase to the gas phase, forming water vapor. Cavitation distorts the flow of water, resulting in loss of efficiency of pumps, turbine foils and propellers, and can lead to strong shock waves and corrosion of metal surfaces. Ship designers often have to deal with troublesome cavitation, trying to avoid cavitation, such as designing the hull into a streamlined shape.

But the trouble caused by this cavitation,

However, it plays an important role in overcoming the viscous resistance caused by the friction with water.

"Because of the viscous resistance between water and moving objects in water, the resistance experienced by objects in water is about a thousand times that of air resistance." Fan Wubing said, "But we can use the annoying cavitation, A renewable gas envelope is formed around the lower object, which minimizes the wetted area of ​​the fluid on the surface of the object, thereby greatly reducing the viscous resistance. This low-density bubble is a supercavitation. The length of the cavity is related to the speed of the object , the object can move forward rapidly with the least resistance inside the long bubble it generates. This is the design principle of the Blizzard torpedo."

Sun Lao asked, "The phenomenon of cavitation is easy to demonstrate, but how feasible is it to manufacture supercavitation by yourself? The speed of torpedoes in water changes. At what initial velocity can we obtain the ideal supercavitation?"

"This question depends on my Blizzard design drawing." Fan Wubing pointed to the Blizzard design sketch hanging on the wall and talked, "Blizzard torpedo uses rocket engines to generate a large number of air bubbles in the head of the torpedo. , so that the torpedo is completely surrounded by the cavity, and the resistance of the water is greatly reduced, thereby reaching a very high speed. That is to say, the mine body is not in direct contact with the water, and the resistance of the natural water is minimal. The obstacle to the high-speed navigation of the torpedo is like this It was subtly resolved. And his initial velocity should be more than 100 knots! The most critical issue is the component cavitation generator that produces the super cavitation phenomenon. However, how much density is generated in what part, What size and pressure the bubbles are, this is the problem that the seniors here need to solve.”

"How did you get the initial velocity data? Is there any theoretical basis?" someone asked.

Fan Wubing shrugged his shoulders and replied, "If we have to look for theoretical basis for everything, I am afraid that we are still living in a primitive society. I can only guarantee that if you refer to the data I provided when you are doing experiments, seniors, It won't be in vain."

Next, Fan Wubing continued to answer everyone's questions about the various designs of the Blizzard torpedo, such as why there are eight nozzles of small rocket motors around the main rocket motor on the central shaft at the rear of the torpedo, and the nozzles protruding from the side of the torpedo shell. What are the functions of the eight folding brake arms, and how to ensure that the high-speed Blizzard torpedo can maneuver in the water, etc.

After an explanation, everyone suddenly became enlightened, but Fan Wubing couldn't hold on anymore. God knows where these old experts came up with so many questions, it's like a hundred thousand questions!

At any rate, this matter has been dealt with. Whether Blizzard can make it happen depends on the ability of these old experts.

Fan Wubing personally had great confidence in them.