Take Off My Aviation Era

Seeing that Song Changzheng finally couldn't hold back, and began to look excited, Director Zhao smiled: "Of course, the information in this aspect of our spaceport is naturally more complete than you want to grasp, so let me tell you, if trigeminal The Ji-2 submarine-launched missile does not have carbon fiber reinforced aluminum-based composite materials, and its range must be reduced by at least 20% to 30%. You must know... Uh..."

Director Zhao paused as he talked, and it doesn't work if he doesn't stop, because he doesn't know the specific parameters of the carbon fiber reinforced aluminum-based composite material used in the Trident 2 submarine-launched missile.

So I can only look at Zhuang Jianye, the meaning is obvious, and quickly talk about your carbon fiber reinforced aluminum matrix composite materials, so that his old brother will not be embarrassed again.

The customer’s needs are Zhuang Jianye’s unshirkable responsibility, so the moment Director Zhao cast his gaze, he hurriedly said with a smile: "The specific strength of ordinary titanium alloys is 1.1; the specific modulus is 102; what data is American? I know, but the specific strength and specific modulus of our carbon fiber reinforced aluminum matrix composites are three times that of titanium alloys."

"so tall!"

Li Fang's eyes widened as soon as he said this, and he felt a little unbelievable. It is necessary to know that specific strength and specific modulus are common ratios in materials science. They mainly show the absolute weight or pressure that a material can withstand per unit volume. This also measures the structural strength of the material.

The larger the value, the higher the strength of the material and the smaller the unit usage.

Therefore, these two values ​​are the most critical data for measuring materials in the aerospace field. There is no way. The aerospace field is pursuing materials with light weight and high strength.

In the past, titanium alloy was regarded as the handle of this type of material. Nowadays, carbon fiber reinforced aluminum-based composite materials instantly roll titanium alloy on key data. As a Naval University of Engineering specializing in materials and system engineering, Li Fang is not shocked.

As a result, before Li Fang’s expressions of surprise were released, Zhuang Jianye’s subsequent expressions made his surprise a secondary superposition: "This is not too high. The characteristics of carbon fiber reinforced aluminum matrix composites are the most Just make a D-50 receiver, of course, because of its lightness, the weight reduction effect is still very obvious, but the contribution rate is also about 10%, after all, magnesium alloy is also very light.

The other two materials that really play a key role are the other two materials. First, the silicon carbide fiber-reinforced aluminum-based material, which has a specific strength and specific modulus five times higher than that of titanium alloy, is compared with the previous alloy materials. The material is lighter, stronger, and has better heat resistance. So using silicon carbide fiber-reinforced aluminum-based materials as the core, the working efficiency of the compressor blades made has almost doubled, uh... the improved hx-4 —What is the compressor pressure ratio of Type 1 core compressor? "

Zhuang Jianye asked Qian Qiang about this, and Qian Qiang replied without hesitation: "From the previous 6 to 7.2."

Zhuang Jianye nodded and continued: "Then it is the titanium-based material reinforced with silicon carbide fiber, which is also the most critical material for d-50 except for turbine blades. The specific strength and specific modulus are six to eight times that of ordinary titanium alloys. In addition, the mechanical properties remain very good at high temperatures above 800 degrees Celsius.

Therefore, this material is used in combustion chambers, turbine discs, turbine guide vanes and transmission shafts. It is a large number of applications of silicon carbide fiber reinforced titanium-based materials. Although our d-50 has been extended to three meters in length, its overall quality The reason for being controlled at 857 kg.

But this does not mean that the performance of our d-50 cannot keep up. On the contrary, it is precisely because of the application of a large number of metal-based composite materials, coupled with the nickel-based alloy turbine blades equipped with a cooling system, our improved hx- The temperature in front of the turbine of the Type 4-1 core engine has increased from 1000k before to 1350k now. "

"It is from 727 degrees Celsius to 1077 degrees Celsius." Qian Qiang added.

"A total increase of 300 degrees Celsius!" This is not only Li Fang, even Song Changzheng could not help but exclaim.

Zhuang Jianye smiled embarrassedly and nodded: "This is already the limit of the hx-4-1 core machine. In the next step, we are going to integrate the existing advanced materials on the basis of the hx-4-1 core machine. The power is 6 MW, the air intake is 11, and the total temperature before the turbine is 1600k to 1650k, which is 1327 degrees Celsius to 1377 degrees Celsius.

The current model name is tentatively designated as the hx-11-6 core engine; on the other hand, it will continue to tap its potential based on the d-50, and strive to introduce turboprops, turbofans, and gas power devices for power generation. To achieve this, the most important thing is to solve the reliability problem of the D-50 first. After all, the current D-50 overhaul interval is somewhat short, and the gap is obvious compared with similar foreign products. "

The three of them were stunned. Director Zhao didn't need to say, but at this moment, he was still confused and handed over to Zhuang Jianye. Shouldn't he talk about carbon fiber reinforced aluminum matrix composites? How to say the topic is crooked? Turned onto D-50?

Compared to Director Zhao’s bewildered surprise, Li Fang and Song Changzheng were really surprised. Although the Navy also desires submarine-launched missiles, the main body of submarine-launched missiles is not led by the navy, but by Director Zhao’s aerospace department. So the navy eagerly returns to longing but can only wait passively.

In contrast, naval aviation power is the focus of the two men. After all, from World War II to the present, the sea dominance that wants to go must first obtain air dominance.

Therefore, the strength of naval aviation power determines the level of naval combat effectiveness, and the aero engine is the indispensable core of naval aviation power, which naturally arouses the attention of the two.

But because of this, Li Fang and Song Changzheng were stunned by what Zhuang Jianye said, and the temperature in front of the turbine actually reached 1,077 degrees Celsius.

How much is a turboprop of the same level—6? But only 792 degrees Celsius.

It was 285 degrees Celsius higher.

What does this show? D-50 still has potential to be tapped.

Because the turboprop-6 at 792 degrees Celsius has reached the level of three kilowatts, an increase of 285 degrees Celsius d-50 is definitely more than this level. You must know that the aero engine wants to increase the power to increase the temperature in front of the turbine. It will increase by 20%. Compared with the turboprop-6, the d-50 is increased by 285 degrees Celsius. The power should be increased by nearly 60%. In other words, the d-50 of this model is only due to the turboprop system. If its potential is not fully utilized, if it is replaced with a large bypass than a turbofan, or a small bypass is more powerful than a turbofan, the effect will be immediately apparent.

According to the current temperature in front of the turbine, the d-50 converted into these two engines will have a thrust of 4 to 6 tons.

This data is incredible. You must know that the turbojet engines on the F-7 are at this level, but this is only on paper and is far from being achieved in practical applications. If the d-50 of the Ascendas Aviation Corporation can be changed to If the small bypass is stronger than the turbofan, will the J-7 have a qualitative leap?

Li Fang and Song Changzheng kept thinking about it in their minds. At this moment, Zhuang Jianye mentioned the most critical flaw, the reliability problem. The two people who were thinking about it immediately froze, and Li Fang immediately asked: "Then your d- 50 What is the current overhaul interval?"

Zhuang Jianye didn't speak, but looked at Qian Qiang, and Qian Qiang sighed helplessly, and said in frustration: "It's just been 1860 hours."

As soon as he was on a business trip, he didn't stagger Li Fang, and hurriedly exclaimed: "Such a high overhaul interval is called poor reliability?"