pdf-ebookys #405 - Turbojet 70%, more than 70%!
#405 - Turbojet 70%, more than 70%!
The Spring Festival of 1955 had just passed. At the Aviation Power Research Institute, a new jet engine was placed on the test stand.
Invited to participate in the initial test, Ren Zhong looked at the huge engine on the test stand and asked with great interest, "Is this the Wopen-7 that we successfully copied based on the J79 turbojet engine?"
After obtaining the F-4H from the main world, Ren Zhong's top priority was to dissect the J79 on the aircraft. He also used a 3D printer to create a 1:3 simulation model for the research team in the Liangjian world to study.
Coupled with the successful research and development of the first generation of high-temperature alloys, the research on this turbojet engine was basically completed with little twists and turns, resulting in two samples.
"Yes, Mr. Ren. The Wopen-7 engine is 5.3 meters long and 1 meter in diameter. Our first version completely maintains the original appearance in terms of size. It basically replicates the dimensions and model you provided. Theoretically, it should be exactly the same as the design in the drawings you provided," replied Professor Ding Hongjun, who was accompanying him.
"Of course, we have now discovered more than a hundred problems from analog tests. We believe that after optimization and improvement, the length of the engine can be shortened somewhat. For this one being tested today, we will keep it in a firing state and first conduct a 72-hour test. After inspection, we will continue to conduct a 240-hour full-load limit time life test.
The other prototype will be used to conduct various functional tests and verifications. If there are no major problems in the first round of tests on both sides, the first Wopen-7 engine production line that we have completed will enter the trial production of the first batch of finalized models, with a planned monthly production capacity of 20 units for the time being."
Currently, in the Liming Research Institute, the research, pilot testing, and preliminary production lines are all concentrated in one place, which is convenient for forming an integrated closed-loop ecosystem of research, testing and verification, and production. After the product maturation is catalyzed, the production line and production process design drawings will be standardized and handed over to a real factory for production.
For example, between the Aviation Power Research Institute under the Liming Research Institute and Liming Power Co., Ltd., the Aviation Research Institute has a complete chain from design to production, but Liming Power only has a production line!
If the monthly production of engines is 20 units, it means that the maximum monthly production capacity of the new Super-7 fighter jet is only 10 aircraft.
After all, the Super-7 fighter jet is a heavy fighter with two jet engines.
"I believe in your strength in the functional part. With the production and research experience of the Wopen-5 engine, all aspects of the engine's functions must be available, but the life of the engine is crucial. On the one hand, it affects the total cost during the entire life cycle of the fighter, and on the other hand, it has a great impact on the combat effectiveness of the air force."
"This engine must be greatly improved from the overhaul cycle of 200 hours of the Wopen-5 to more than 1,000 hours, so as to meet the requirements of frequent take-off operations of future fighter jets."
J79 Turbojet Engine
This is the most important indicator for Ren Zhong.
This means that the engine has to be replaced for maintenance every quarter.
Whether it is the frequency of maintenance work or the quality of the engine itself, Ren Zhong is very worried about the Wopen-5.
Especially during the operations on the peninsula, although the performance of the fighter jets was remarkable and invincible in the air.
But maintenance was a nightmare for the logistics department. After several high-intensity battles, the performance of the Wopen-5 deteriorated very quickly under full-load operation!
It even fell far short of 200 hours before a new engine had to be replaced, and the original engine was replaced for overhaul.
In many ways, this is a defect in the original design of the Wopen-5 engine, and even if the processing conditions are a little better than before, it is of no use.
The J79 was developed by GE of the United States in the 1950s. The first ground test stand test was on June 8, 1954, the first flight test was on May 20, 1955, and the 25h finalization test was completed on December 8, 1955. The main indicators are a turbine front gas temperature of 1205K, a pressure ratio of 13.5, a thrust-to-weight ratio of 4.61, an intermediate thrust of 53kN, a fuel consumption rate of 0.87 kg / (dN · h), and a maximum afterburning thrust of 80kN, with a fuel consumption rate of 2 kg / (dN · h). Although the thrust-to-weight ratio looks rubbish, with an overhaul cycle of more than 1,000 hours, this turbojet engine has a stable and reliable characteristic, and its life cycle is more than 30 years, with nearly 20,000 units produced, and it was even applied to early F-16 fighters.
Ren Zhong's money for buying fighter jets was not wasted being able to pick up such a treasure.
Of course, for Dongda in the main world, they can't look at such goods now. Taihang (WS-10), Emei (WS-12), Tianshan (WS-13), and Huangshan (WS-19) have already formed a full range of advanced turbofan engines with high, medium, and low configurations.
But to say that 20 years ago, around 2000, the J79 engine was still very attractive to Dongda.
Taking the long-term imported RD-33/93 as an example, the intermediate thrust (maximum thrust without afterburner) is 50kN, the maximum thrust (thrust with afterburner) is 81.4 kN, and the afterburner ratio is 1.628; the intermediate fuel consumption rate is 0.785 kg. (daN. h) ˉ 2, the maximum fuel consumption rate is 2.73 kg · (daN · h) ˉ 1, and under the architecture of the turbofan, the various indicators are not far from the J79!
The roughness of the Russian aeroengine is evident.
With this excellent turbojet engine, which can be called the best choice for a while, the ferry range of the F-4J fighter can reach 1699 nautical miles, or 3147km, with two 370-gallon and one 600-gallon auxiliary fuel tanks. Its combat range is 981 nautical miles, or 1817km, with four Sparrow missiles and no auxiliary fuel tanks.
This range is quite impressive even after 2020 in the main world. The range of the F-16, the third-generation main fighter of the rogue eagle without auxiliary fuel tanks, is 1825 kilometers, which is comparable to the F-4J.
The ignition experiment and the 72-hour experiment were very successful, which made Ren Zhong very satisfied. The technology in terms of the first generation of high-temperature alloys and titanium alloys imported from the main world is now sufficient to support the development of turbojet engines and early turbofan engines, but the detailed process technology of carbon fiber and the second generation of high-temperature alloys is not so easy to obtain.
Early carbon fiber can still be purchased from fishing rod factories, but technology after T500 can't be bought even with money.
However, these things are far ahead of the Liangjian world, and Ren Zhong is not in a hurry to eat everything at once. With the first generation, he will invest in research in the two worlds, the main world and the Liangjian world. Looking at the fragmentary technical paths in front of him, it is obviously much faster than groping in the dark.
The aviation engine, originally a pain point for Dongda in the main world, saw Dongda in the Bright Sword world rapidly surpass the world thanks to Ren Zhong's imports, taking the lead in producing the J79, a top-tier turbojet engine.
With this breakthrough in turbojet engine technology, the simulation of the F-4 fighter jet was left with only a few minor issues. Even transplanting the radar from the J-5A would be a significant improvement over the radar technology in this world!
Coupled with its powerful twin engines, a massive range of nearly 2000 kilometers, and nine hardpoints capable of carrying over 7 tons of weapons, this Super-7 fighter is completely ahead of all current fighter jets, a unique existence.
F-4 Phantom II Fighter Jet
Of course, its lead in this world won't last too long. The Rogue Eagle, through its accumulation of technology and talent scavenged from the entire Western world during World War II, also possesses unparalleled competitiveness in aviation.
Even without the stimulus of Ren Zhong's J-5A, the F-4 fighter jet would have begun design next year (1956), achieved its maiden flight in two years, and entered service with the Navy in 1961!
For this world, this fighter jet will maintain strong combat effectiveness for as long as 30 years.
Of course, now that there's Ren Zhong, the 'involution king,' its lifespan might be significantly shortened.
This is true for both Dongda and the Rogue Eagle.
Therefore, Ren Zhong doesn't know how far the Super-7 will ultimately go.
According to the plan, after the J79-based Wopen-7 aviation engine is mass-produced, the new fighter jet will take shape.
According to the previous plan, this new fighter jet should have been the J-7 model, but its combat effectiveness far exceeds Ren Zhong's understanding of the J-7's capabilities, causing him to hesitate.
The Super-7's test flight is imminent. In fact, the full-scale Super-7 was completed even earlier than the engine, and a total of four were produced in the first batch. One is for wind tunnel testing and destructive extreme testing, while the other three will serve as test aircraft for long-term verification of the new fighter jet's performance and manufacturing quality.
After seeing the physical test of the new Wopen-7 engine, Ren Zhong felt much more at ease.
With this aviation engine, even if there is no new progress in the next twenty years, there will be a guaranteed asset in terms of air force fighter jets.
It should be known that this engine is not only compatible with the F-4 fighter jet. According to the Rogue Eagle's plan, there is also the F-104 single-engine fighter jet, designed as a high-low mix with the F-4 fighter jet.
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F-104 "Starfighter"
It's just that this fighter jet has an ugly appearance. Since then, no fighter jet with such a shape has reappeared. It is estimated that the Rogue Eagle pilots were also cried by such a design.
Touching such a failed sample, Ren Zhong certainly won't repeat the same mistake and step into the pit for the Rogue Eagle in advance.
After searching and comparing in the main world, Ren Zhong chose a new product with a simpler design but high combat effectiveness and cost-effectiveness: the Mountain Eagle Light Fighter.
This light fighter, derived from a trainer aircraft, might be somewhat outdated for fighter use in the 21st century of the main world, but in the late 1950s and 1960s of the Bright Sword world, it is undoubtedly an advanced fighter jet.
Mountain Eagle Trainer/Fighter (FTC2000G)
Purely from the appearance, the Mountain Eagle fighter jet looks far superior to the Phantom, but in terms of technical level, apart from the avionics adopting some new technologies from the 21st century, the rest may not be stronger than the F-4.
For example, the Mountain Eagle fighter jet (FTC2000G export model) uses the Wopen-13F.
The WP13F has a thrust of 4315daN and an afterburning thrust of 6236daN. It began development in the main world in 1984 and passed the 300h design finalization national appraisal test in April 1992. However, the first overhaul period is 300h, and the total lifespan is 900h. This indicator is far worse than the J79.
Therefore, using this Wopen-13F engine to power a light fighter jet feels a bit weak in terms of thrust, especially as it is not conducive to increasing weapon payload and improving combat effectiveness. After replacing it with the new Wopen-7 based on the J79, on the one hand, there is a performance improvement for self-use, and on the other hand, the competitiveness will also increase when selling to foreign military aid customers.
Due to the adoption of a two-seat design, this fighter jet is also suitable as a trainer aircraft. Compared to the J-5A, both the power and take-off weight have made great progress. The maximum range can reach 2400 kilometers, the maximum flight time is 3 hours, the maximum payload weight can reach 3 tons, the maximum take-off weight is 11 tons, and it has 7 weapon hardpoints, which can carry rockets, aerial bombs, air-to-air combat missiles, guided bombs, and various pods.
In the Bright Sword world, where propeller fighters are still the main force, this configuration can almost be said to be a complete beatdown!
Of course, it is more difficult to build this FTC2000G light fighter than the Super-7 based on the F-4, because Ren Zhong cannot obtain the detailed dimensions of the fighter's spare parts. Unlike the F-4, which can have a real aircraft for comprehensive research and measurement, it is equivalent to completely eliminating the design process.
But it is impossible to get a real aircraft for the FTC2000G.
Even if this model is active in exports, if Ren Zhong uses the connections of the Black West African country, he might be able to buy one, but this is one of the latest main battle equipment in the main world. Any addition of two more unknown fighter jets in Black Africa may lead to a tense regional situation.
After all, weapons of mass destruction like fighter jets are sacred in places where they haven't fully eaten their fill.
Even if Ren Zhong dares to buy it back, he probably won't escape the consequence of being forcibly robbed by the locals.
For the Black uncles, things like credit don't exist. Whoever is strong, whatever is obtained belongs to you.
Since this is the case, the design of this fighter jet must be started from scratch, starting from aerodynamics, and verified little by little in the wind tunnel.
Since the general appearance and various structures are described, after completing the manufacturing and processing of the F-4, Ren Zhong doesn't believe that this team has no way to redesign and manufacture the FTC2000G fighter jet.
Coupled with the powerful power supply of the new Wopen-7, appropriately enlarging some structures to get the weapon load to about 4 tons as a self-use model, and setting the export model at 3 tons, can also be considered making the best use of resources.
Ren Zhong cannot completely design a new fighter jet solely for export.
Of course, before exporting this light fighter, the J-5A is the real main export model. After all, that fighter jet has a more mature manufacturing process, lower cost, and its combat effectiveness is closer to the current Bright Sword world. Only after the J-5A can no longer compete in this world will Ren Zhong consider using the new FTC2000G light fighter to replenish the national teams of the vast third world countries in this new world.
During a test, Ren Zhong triggered inspiration and began looking for substitutes for aviation design and styling. After shuttling through the ocean of information in the main world, he successfully selected the FTC2000G, because aside from the avionics, this model is most similar to Ren Zhong's new idea. However, the styling of this fighter jet is not easier to make than the F-4, and the process flow design engineers may have to work overtime.
(End of chapter)