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Chapter 470 Performance that subverts imagination

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    Seeing that Song Changzheng finally couldn't stand it anymore and started to get excited, Director Zhao chuckled: "Of course, our aerospace industry has more complete information about this than what you want to grasp. Let me tell you this, if Sancha  The Halberd 2 submarine-launched missile does not have carbon fiber reinforced aluminum matrix composite materials, and its range must be reduced by at least 20% to 30%. You know well"

    Director Zhao paused as he spoke, and it wouldn¡¯t work if he didn¡¯t pause, because he didn¡¯t know the specific parameters of the carbon fiber-reinforced aluminum matrix composite material used by the United States on the Trident 2 submarine-launched missile.

    So I can only look at Zhuang Jianye, the meaning is very obvious, hurry up and tell me how your carbon fiber reinforced aluminum matrix composite material is, so as not to embarrass his old brother again.

    The needs of customers are Zhuang Jianye's unshirkable responsibility, so the moment Director Zhao cast his eyes on it, he quickly said it with a smile: "The specific strength of general titanium alloy is 1.1; the specific modulus is 102; I don't know what the American data is.  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!"

    As soon as these words came out, Li Fang's eyes widened instantly, feeling a little incredible. You must know that specific strength and specific modulus are common ratio quantities 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 less the unit usage.

    So 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 alloys were considered the leader among this type of materials. Nowadays, carbon fiber-reinforced aluminum matrix composite materials instantly surpass titanium alloys in key data. How could Li Fang, who specializes in materials and systems engineering at the Naval Engineering University, not be shocked.

    As a result, before Li Fang's surprised expression was fully released, Zhuang Jianye's next expression made his surprise double: "This is not high. With the characteristics of carbon fiber reinforced aluminum matrix composite materials, at most  Just make a D-50 receiver. Of course, because it is light, the weight reduction effect is still very obvious, but the contribution rate is only about 10%. After all, magnesium alloy is also very light.

    What really plays a key role are the other two materials. First, let¡¯s talk about the silicon carbide fiber reinforced aluminum-based material, which has a specific strength and specific modulus that are five times higher than that of titanium alloy. Compared with previous alloy materials, silicon carbide fiber-reinforced aluminum-based materials  The material is lighter, stronger and has better heat resistance, so using silicon carbide fiber-reinforced aluminum-based material as the core, the working efficiency of the compressor blades made is almost doubled, um the improved hx-4  ¡ªWhat is the pressure ratio of the compressor of type 1 core machine?  "

    Zhuang Jianye was asking Qian Qiang, and Qian Qiang replied without hesitation: "It has been improved from 6 to 7.2."

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

    Therefore, this material is used in combustion chambers, turbine disks, turbine guide vanes and drive shafts. It is the large-scale application of silicon carbide fiber reinforced titanium-based materials. Although our D-50 has been expanded to three meters in length, its overall mass  The reason for being controlled at 857 kilograms.

    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 matrix composite materials, coupled with the nickel-based alloy turbine blades equipped with a cooling system, that our improved hx-  The temperature in front of the turbine of the Type 4-1 core machine has increased from the previous 1000K to the current 1350K.  "

    ¡°It¡¯s from 727 degrees Celsius to 1077 degrees Celsius.¡± Qian Qiang added on the side.

    "It has increased by a full 300 degrees Celsius!" Not only Li Fang, but also Song Changzheng couldn't help but exclaimed.

    Zhuang Jianye smiled sheepishly and nodded: "This is already the limit of the hx-4-1 core machine. In the next step, we are going to integrate existing advanced materials and develop a research and development cycle based on the hx-4-1 core machine.  The power is 6 megawatts, the air intake is 11, and the total temperature in front of the turbine is 1600k to 1650k, which is 1327 degrees Celsius to 1377 degrees Celsius.

    The current model name is tentatively designated as hx-11-6 core engine; on the other hand, we will continue to tap its potential based on the d-50 and strive to launch turboprops, turbofans and gas power devices for power generation. Of course, we want to  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 dumbfounded after hearing what they said. Director Zhao, needless to say, was still in a daze at the moment. He turned the conversation over to Zhuang Jianye. Shouldn't we talk about carbon fiber reinforced aluminum matrix composite materials?  How to sayDid the topic change while you were still talking?  Turned into D-50?

    Compared with Director Zhao's confused surprise, Li Fang and Song Changzheng were really shocked. Although the Navy also desires submarine-launched missiles, the main body of submarine-launched missiles is not the navy, but Director Zhao's aerospace department.  Therefore, the Navy is eager to return to its 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, if you want to have sea control, you must first obtain air control.

    Therefore, the strength of naval aviation power determines the level of naval combat effectiveness, and aviation engines are the indispensable core of naval aviation power, which naturally attracted the attention of the two men.

    But because of this, Li Fang and Song Changzheng were stunned by what Zhuang Jianye said. The temperature in front of the turbine actually reached 1077 degrees Celsius.

    How much is a turboprop of the same level - 6?  But it's only 792 degrees Celsius.

    A full 285 degrees Celsius higher.

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

    Because the turboprop-6 at 792 degrees Celsius has already reached the 3,000-kilowatt level, and the D-50 with an increase of 285 degrees Celsius is definitely more than this level. You must know that if an aeroengine wants to increase the power, it means to increase the temperature in front of the turbine. Every 100 degrees Celsius increase, the power  It will increase by 20%. Compared with the turboprop-6, the D-50 has an increase of 285 degrees Celsius, and the power should be increased by nearly 60%.

    In other words, the D-50 in this model today is just because the turboprop system has not fully exerted its potential. If it is replaced with a large bypass ratio turbofan, or a small bypass ratio turbofan with afterburner, the effect will be obvious immediately.

    Based on today¡¯s turbine front temperature, the D-50 converted to these two engines will have a thrust of 4 to 6 tons.

    This data is incredible. You must know that the current turbojet engine on the J-7 is at this level, but this is only on paper, and the actual application is far from reaching it. If the D-50 of Ascendas Aviation Corporation can be changed to  If the small duct is more powerful than the turbofan, will the J-7 make a qualitative leap?

    Li Fang and Song Changzheng were constantly thinking about it in their minds. At this moment, Zhuang Jianye pointed out the most critical flaw, the reliability problem. The two people who were thinking about it immediately felt a thump in their hearts. Li Fang immediately asked: "Then your d¡ª  50What is the overhaul interval now?¡±

    Zhuang Jianye didn't speak, but looked at Qian Qiang, who sighed helplessly and said with disappointment: "1860 hours have just passed."

    When these words came out, Li Fang almost staggered and shouted anxiously: "How can such a high overhaul interval be called poor reliability?"

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