Chapter 833: Confident

"Dear friends from Ibos, what you see now is the TF41912-B52 engine jointly developed by British Rolls-Royce and Allison of the United States. This engine is 5061 mm long, 1105 mm in diameter and 1836 kg in mass. Under the current state of technology, the military uses 6.8 tons of afterburner thrust, 10.5 tons of afterburner thrust, 5.7 thrust-to-weight ratio, and 0.74 bypass ratio. What I have to say is that this engine was originally designed to bid for the U.S. Navy’s F -14 was developed for the reissue plan. Therefore, its size and installation accessories can perfectly fit this type of fighter, and only a very simple modification is required.
Tan Zhenhua’s introduction caused the "buzzing" of several bearded men in military uniforms. After a while, one of them asked in English with a strong accent: "Mr. Eric, from the data. , The performance of this engine is better than the TF-30 engine equipped on our current F-14, but, as you said just now, it was jointly developed by British Rolls-Royce and Allison, then you How do you supply it to us? Can you get the goods from these two companies? Both countries have embargoes on us."
"Colonel Kianusz Jalari, you have a good question." Tan Zhenhua chuckled his lips and said: "Britain and the United States have imposed an embargo on your Ipers, so you can't buy the weapons they produce, or even Even the supply of accessories is a problem--but Huaxia doesn't have it? We can sell it."
The "buzzing" discussion suddenly became louder, and after Jalari signaled to be quiet, he asked again: "Mr. Eric, can I understand what you just said like this-you can do it through some channel? To this kind of engine and sell it to us?"
"No, dear Colonel, it's not like that. I mean, this engine can be produced by China and sold to you. It has nothing to do with Britain or the United States."
The "buzz" sounded again uncontrollably, and this time, Kianush Jarali didn't even stop it, but hurriedly asked: "What do you mean, Eric, can you say Need more details?"
"Of course, Mr. Colonel, this is actually the purpose of my inviting you all to come to Xijing from a long distance. The previous drones are only used to build trust between us." Tan Zhenhua said with a smile: " In fact, it is very simple to explain clearly, Mr. Colonel, please read this document."
As he said, he handed over a document in his hand.
Jalari took the file, read it very carefully, and gave it to the accompanying people to read them one by one. Then he sighed and asked: "So, Eric, you have obtained this Technical authorization and production license for this engine?"
"Yes, Mr. Colonel, so this engine will be here. He stretched out his arms and turned around and said, "It is produced at our Xijing Engine Plant in China, regardless of whether it is Rollo or Allison. Ask who we sold it to. "
The impatient officer took a step forward and wanted to ask something more, but he was stopped by Jalari waved his hand. He pondered for a moment before he spoke again: "Eric, please pardon me. We have used aero engines. After all, we have also bought your "J-7" fighter. To be honest, its performance is very average. How can you guarantee the quality and applicability of the engine you produced this time? I know that there is still a big difference between turbojet and turbofan engines, and I have not heard that China has produced qualified turbofan engines."
Tan Zhenhua shrugged his shoulders and said, "Sorry, Mr. Colonel, I am afraid you will be disappointed. I don't have any guarantees, but I think we are probably the most promising solution to your F-14 fighter engine problem. , We all know that the TF30 engine is in use right? And you don’t have other reliable sources, right?"
Zhan Nuozhu, who was with him, looked at Tan Zhenhua in surprise. He felt that his attitude today was very strange. It was not at all his usual polite and humble style. There was a hint of arrogance in his words. How about a word to describe it-there is no fear?
Well, yes, Tan Zhenhua is confident.
The F-14 fighter jet produced by the American Grumman Company is undoubtedly one of the most advanced and deterrent weapons currently equipped by Ibos.
This precious legacy inherited from the previous regime is that since the beginning of the Iran-Iraq War, the Iraqi Persian country has resisted with the support of the entire Arab world and has secretly communicated with the two superpowers of the United States and Soviet Russia. Kra's offensive trump card.
The combination of F-14 fighter + AN/AWG9 radar + AIM-54A air-to-air missile has become a nightmare for countless Ikra pilots.
However, the F-14, which has a sci-fi-like swept-back wing shape, powerful combat capabilities, has attracted countless fans in China, and even has a professional fan team "Cat Party" fighters also have weaknesses.
After all, it was developed in the late 1960s and early 1970s. At that time, even if the technological strength was as powerful as the United States, it was not equipped with an excellent engine.
The TF-30 engine is the Achilles' heel of the F-14 fighter.
This engine developed by Pratt & Whitney in the 1960s has a weight of 1.9 tons, a diameter of 1293 mm, a maximum afterburner thrust of 9.5 tons, a thrust-to-weight ratio of only 5, and a bypass ratio of 0.9.
The bypass ratio, also called the bypass ratio, is the ratio of the air flow between the outer duct and the inner duct of the turbofan engine. The air in the inner duct enters the combustion chamber to mix with fuel and burns to do work. The air in the outer duct does not enter the combustion chamber, but passes through the fan at a relatively slow speed and mixes with the gas flowing out of the inner duct before being discharged. After the two gases are mixed, the average flow rate and temperature of the nozzle are reduced. The lower flow rate brings higher propulsion efficiency and lower noise, and lower temperature can also bring higher thermodynamic efficiency. These two factors Together, the efficiency of the turbofan engine is qualitatively improved compared to its predecessor turbojet engine.
This is also the reason why turbofan engines save much fuel than turbojet engines.
To put it simply, in the case of the same core aircraft, the greater the bypass ratio, the greater the thrust and the more fuel-efficient. This is the reason why the engine bypass ratio used in modern passenger aircraft is increasing. The bypass ratios commonly used in the engines of
are all over 5, and the more advanced models are even close to 10.
However, a larger bypass ratio also means that the engine needs a larger external ducted fan, which makes the cross section larger, the greater the resistance during flight, and the greater the ability of the aircraft to maneuver. Poor-This situation has a greater impact on high-altitude or supersonic flight. Therefore, for some fighters pursuing high-altitude supersonic performance, the bypass ratio is actually as small as possible.
The TF30 engine has a bypass ratio of 0.9, which determines that this engine must perform poorly at high altitudes and high speeds.
But this is not the deadliest.
Ipos inherited the legacy of 80 F-14 fighter jets from the previous regime, but its original model F-14A, the engine on it, of course, is also the original TF30-P-412, and this model can be said It is the pit cargo that Pratt & Whitney delivered in a hurry in order to catch up with the progress of F-14A!
The children’s shoes who have seen the famous movie "Rising Clouds" starring Tomoe should still remember how Tom Tom’s first comrade on the same plane hangs up-one of the two F-14 engines happened The compressor surged and stalled, causing the asymmetry of the fighter's thrust to trigger a horizontal spiral. The fighter lost the ability to recover and crashed as a result.
This scene in the movie very realistically reproduces this fatal problem of the F-14 fighter. In fact, due to the TF30 engine’s susceptibility to surge and stall, in the early days of the F-14A’s service, the pilots piloted the aircraft during air combat training. They were all very frightened, lest the engine stall due to violent maneuvers, the pilots were also warned not to turn violently, otherwise they would cause surging due to poor air intake on one side.
That’s not to say, the reliability and efficiency-cost ratio of this TF30 engine at the beginning of its service is simply horribly low, with a first turn of 150 hours, a full life of 1,000 hours, plus the price that is more expensive than the sky...
Tan Zhenhua knew that Ibos bought the F-14. It was still in 1976. It was ordered by His Majesty King Pahlavi, who was also a pilot and was extremely close to the rice, for a test drive. It has been 7 years now, just count. Even if you know that these "Persian cats" have reached the time when they need to replace their engines, even if Ipos bought a few spare engines back then, they can face the consumption of the aircraft, especially the flight hours of the engines, in the fierce war. I'm afraid that the inventory is about to bottom out, right?
Perhaps the Persians are using the method of dismantling some of the aircraft to ensure the supply of spare parts for the remaining aircraft, so as to maintain a small fleet that can take off normally!
With this information as a base, Xiao Tan Tan can of course be confident and sharp!