Chapter 1843: Engage in lift fans

You can’t have both fish and bear’s paws. If you want to cover everything, all aspects are advanced. Of course it’s impossible, unless it is the super abnormal Eagle Country technology of later generations that can come up with an engine with a power-to-weight ratio of 10. It's also super fuel-efficient. Even so, the Eagle Country's F-35 vertical take-off and landing fighter still has frequent breakdowns. After so long, the project cost is constantly overrun.
In the current state of Xiong, the engine is inherently fuel-consuming and the thrust-to-weight ratio is not high. It is quite difficult to reach the level of later generations.
According to their design, the Yak-141 fighter has a longest range of 1,500 kilometers in a vertical take-off and landing state, which is already much stronger than that of the mast guard. If it is a short take-off, with a secondary fuel tank, it can reach 2100. Kilometers, but now, even if you only look at the light F-16 fighter jets, the range is easily 3,000 kilometers away, or even 4,000 kilometers. Therefore, the range of the Yak-141 is still quite short.
Now, Qin Guan actually said that the shortcomings of the voyage can be changed, and immediately excited the people present. At this time, everyone was in front of the Yak-38 model, and they were waiting for Qin to face this model. The explanation of view.
How can we increase the maximum range?
"Our vertical take-off and landing fighter uses the layout of the main engine at the back and the lift engine at the front. This method is very mature, the thrust layout is perfect, and it is easy to control. However, this also leads to the overall power system. There are more units, which wastes space and increases fuel consumption. Moreover, the tail flame is too large to ablate the deck."
The staff of the Yakerev Design Bureau secretly admired that Qin Guan was a genius. He saw the key to the problem at a glance and made it clear!
That’s right, this is the main problem facing Yak-38 and even Yak-141, especially the front lift engine, which is directly placed vertically, facing the deck below, the tail flame of thousands of degrees, directly Roasting on the deck, nothing can stand it!
When Han was faced with a problem, the native method was still used, and a layer of refractory bricks was laid directly underneath. Chen Rui came up with it at that time.
Now, Chen Rui is also quietly listening to Qin Guan's analysis. He knows that his brother-in-law must be able to give a perfect solution.
Why does the Sea Harrier fighter do not have the problem of melting the deck? It's because the Sea Harrier doesn't have a lift engine. People use an engine directly, and the air is drawn from the compressor in front.
"Then President Qin, how do you think this problem should be solved?" Dongdukov opened his eyes and looked at Qin Guan. He knew that Qin Guan would be able to give a perfect answer.
"The solution to this problem is actually very simple. Why do we have to put a special lift engine in the front? We put a lift fan, wouldn't it be solved?" Qin Guan said.
The lift engine is a small jet engine that is placed upright and ejects hot gas downward. Now, it is replaced by a lift fan, which is like a large electric fan, which blows downward. In this case, what is blown out is With cold air, the problem of burning the deck is easily solved.
"Ms. Qin, it's not that simple." Hearing Qin Guan's words, Dong Dukov took the stubbornly, because he happened to be in charge of this part. After all, Qin Guan is a layman. The question is too simple: "What we have placed in the front are two lift engines. The thrust of a single engine is 41 kN and the thrust of two engines is 82 kN. If we change the way of becoming a lift fan, what kind of fan do we have that can provide such a strong thrust? This idea is okay. It is unrealistic in engineering. What kind of system are we going to use to promote this fan?"
The fan must be driven to turn, right?
In fact, it is also possible to use a single lift engine. After all, its empty weight is only eleven tons, and the main thrust is from the rear. However, if they have two engines, it is for insurance!
"As long as you use your brain, there will be a way." Qin Guan continued: "We can connect a drive shaft from the main engine behind. This drive shaft can drive the fan in front. Isn’t that enough? And, the biggest advantage of this is that it saves fuel. It is equivalent to the outer duct of the turbofan engine. It only needs to consume very little fuel to achieve the maximum effect."
Now the engines in the world have transitioned to turbofan engines. Compared with turbojet, an external duct is added to the outside. The shaft of the engine drives several large fans, blows backwards, and directly provides thrust backwards. In this way, a lot of extra thrust is added and fuel can be saved.
Now, just build a lift fan and take over the power from the back, and that's all solved.
On the one hand, it is fuel-efficient. You use two lift engines, both of which are turbojet. That cost a lot of fuel. Now it is a big fan. Fuel saving is absolute. On the other hand, the air blown by the fan is cold. , The problem of smelting the deck can be solved.
What Qin Guan said is of course the idea of ​​F-35. The vertical take-off and landing model of F-35 is based on Yak-141. However, they changed the front lift engine to a lift fan, which perfectly avoids The shortcomings of the Jacques VTOL fighter.
Now that Qin Guan had finished speaking, he paused for a while, leaving time for other people to think and react. If smoking is possible here, light a cigarette and wait silently, enough to pretend.
Qin Guan’s words, of course, brought them a huge shock. They had never considered this before. Yes, if they did this, the problem would be solved. They would pull a drive shaft over and put the lift engine in front. , Transformed into a lift fan!
The lift fan is definitely lighter than the lift engine. After all, it is only equivalent to the compressor part of the engine. The weight is reduced, and the extra weight can be used for fuel. At the same time, it can also save fuel. You must know that the vertical take-off and landing fighter is the most When fuel is consumed, it is the stage of take-off and landing. Burning 20 to 30% of the fuel is not a problem. Now it can save half of it. The range of fuel in the aircraft may be from 1,500. Expansion to two thousand?
Moreover, the problem of smelting the deck is solved, this is the perfect fighter!
But is it easy to implement?
Dongshekov first thought of this question. He asked Qin Guan: "Do you know how much power this drive shaft has to transmit?"