Chapter 1139: Major failure after ignition

"Mr. Qin, you came just right." Mr. Wu was directing the preparations before the ignition test. When he heard Qin Guan's arrival, he was quite happy and ran over immediately.
Qin looked at the engine on the test bench with a burst of joy on his face: "We are making good progress."
It takes a long time to study an engine. The F110 of the Eagle is from the F101, and the F101 is from the GE9. It can be said that it has been developed for decades before it truly matures.
Now we are directly engaged in F110-level engines. Naturally, we are standing on the shoulders of giants. We already have a full set of technical data for F110, which is equivalent to the highest version of surveying and mapping imitation. We will introduce Spey technology to produce Spey engines. same.
It's just that Spey is taught by Niu Guo. The teacher leads the apprentice. The new third-generation engine is equivalent to the students reading and learning by themselves.
"Yes, we know that there is a big gap in our country, especially our J-10 fighter, which has already begun to use the Spey modification to finalize it and put it into the army in small batches, but after all, the engine thrust of this fighter is not big. It severely limits the performance of the fighter aircraft, and an advanced third-generation engine is urgently needed." Old Wu said.
The twin-engine J-11 can also be made with a modified Spey. After all, its prototype is not powerful enough, but the variable swept wing is well designed.
But the J-10 is different. The Spey variant with a maximum thrust of only 11.5 tons cannot meet the needs of the J-10. What the J-10 needs is that the maximum afterburner thrust can reach at least 12 tons.
They desperately need new engines to replace them. Now, 4430 Plant is constantly developing engines day and night.
For the core engine, once the experiment is completely passed without any problems, it will be much easier to develop the turbofan engine.
"Yes, in addition to our fighter jets need advanced engines, our passenger planes also need them." Qin Guan said.
At present, the passenger aircraft is also in urgent need of advanced power. Yunshi relies on imported engines to test the flight, and the civil aviation department is not satisfied. The regional passenger aircraft developed by Hansians also needs advanced engines. In addition to fighter engines with bypass ratios, passenger aircraft engines with large bypass ratios are also imminent.
"So we wear the stars and the moon, and strive to produce them in the shortest time." Old Wu said.
As he was talking, a deputy reported: "The lubricating oil has been filled and the fuel pump is ready to start. It can be started at any time."
"Fire!" Old Wu said.
Following Wu’s command, only the sharp whistle of the turbine was heard. Driven by the starter, the core engine was spinning rapidly. When the speed reached, the fuel began to be injected into the combustion chamber. When ignited, high-temperature and high-pressure gas is generated, which drives the turbine blades behind to rotate.
Hot flames spurted from the tail, forming a beautiful flame. Looking at the flame, Qin Guan's face was full of joy: "Is the ignition successful?"
"Slow train state." Wu Lao said, nodding vigorously.
The core engine of an engine must be lit at least first.
After the research and development of Spey's imitation and modification of Spey, Mr. Wu's team has a clear understanding of how the engine is developed. Mr. Wu is also very excited about the normal start of the engine.
After that, the engine was tested. If it works normally at various speeds, and if the long-lasting test runs can also pass, the core engine is almost considered successful.
"Boom." At this moment, suddenly, the engine on the test bench made a noise. With this noise, the engine shell broke and a piece of debris flew directly to the ceiling.
The talent next to Qin Guan came up almost in a stride, and directly protected Qin Guan, and then looked at the engine test bench, that engine had already started to catch fire.
This is too embarrassing, right?
The person next to him rushed up with a fire extinguisher to extinguish the flame on the engine. The roar of the engine gradually disappeared and stopped.
No one thought that a major failure occurred in this engine just a few minutes after the test.
What fault?
"The engine compressor blade is broken." Wu Lao said. Although the engine has not been disassembled yet, he knows the situation just by looking at the situation.
The high-speed rotating blade broke, like a knife, hit the shell, shattered the shell of the engine, and flew into the sky. If it flew to your side, someone might be cut into two pieces.
When the engine stopped, Mr. Wu had already rushed over and looked at the compressor blades in front. He saw that there were three fractures, and the others were not broken, and obvious cracks had appeared.
Looking at these blades, Old Wu's face was full of ashamed: "It seems that the compressor blades that we processed with Spey's technology simply cannot meet the requirements."
At the beginning, when introducing technology to produce the Spey engine, an important difficulty was the production of compressor blades. The domestic process was still precision casting, and the foreign one was already precision forging. At that time, Qin Guan took everyone to find Rolls-Royce negotiated, and with the help of the other's blade workshop quality manager Robert, it was considered that he had mastered this technology.
This is only the technology of the Western world in the 1960s, and it is no problem when used in Spey, but when used in the core machine of the newly developed third-generation engine, it has shown its drawbacks.
In the first test run, all the blades were broken!
"As I said, if we want to build the engines of these three generations, we can only use titanium alloys, not the special alloys of the Spey engine compressor. That strength is not enough." At this time, Robert's voice came. Up.
Robert has become accustomed to life here. He gave up everything in Rolls-Royce and came to Han Guo and joined the R&D team of the 4430 factory. Everyone attached great importance to him.
Robert was originally in charge of blade technology. Now, if there is a problem with the blade, it is of course his responsibility. If you look for the cause in detail, it is because the material of the blade is not qualified!
You have to use titanium alloy!
"In addition to titanium alloys, our processing technology must also be improved. We absolutely cannot use solid blades. Solid fan blades have heavy weight, large centrifugal force, and prominent flutter and vibration problems, which can no longer meet the requirements. Now, Rolls-Royce Company The second generation of titanium alloy hollow fan blades has already begun, and we cannot continue to waste time on such solid blades."
"The first-generation wide-chord hollow fan blades of Rolls-Royce use activation or liquid diffusion welding to connect two hot-blade-shaped titanium plates and an inner thin-walled honeycomb sandwich core into a whole to form a sandwich-type integral blade. The second-generation hollow blades are manufactured using advanced superplastic forming/diffusion bonding technology. The core adopts a Wallen structure instead of the original honeycomb structure. The advantage is that the structure is well integrated. All the connection interfaces are diffused and connected as a whole. Lighter weight and lower cost."
"But, we don't have the necessary processing equipment." Wu Lao said.