Chapter 473: MIT opens champagne at halftime
After hearing Brad's answer, Goldstein was stunned for a moment, and then showed a knowing smile.
Obviously, these academic guys are no different from those in business.
A paper with a high impact factor may also mislead potential opponents in the research and development direction.
Win the pot.
A win-win means that I win twice.
“Can the progress be accelerated?”
Now that Brad has determined the correct research direction, Goldstein, as the representative of the company and Party A, is naturally more concerned about When can we get the results?
Although the NGAD project has not yet been revealed, and the supporting fifth-generation aeroengine does not even have specific technical parameter requirements, the related technology can be applied to the next generation of products that General Electric is promoting. On top of civil aviation engines.
Better cooling performance means higher turbine front temperature, and higher turbine front temperature, in addition to intuitively increasing thrust, can actually reduce fuel consumption while maintaining thrust unchanged—— Because under the same power, the compressor needs to do less work, and naturally consumes less fuel.
For an airliner, this is a sure win.
You know, Airbus is advancing their A3XX super-large passenger aircraft plan to compete with the Boeing 747, and General Electric is also ambitious and is preparing to compete with Rolls-Royce in engine selection. High or low.
It is expected that at least 300 of this super passenger aircraft will be produced. Considering that the engine will need to be replaced several times during its entire life, it will be a huge market of 3,000-4,000 units.
You must know that this is not a gadget like the CFM56. The A3XX needs at least a large bypass ratio turbofan with a thrust of 35-40 tons, and each one is incredibly profitable.
More importantly, after losing to Pratt & Whitney in the selection of two fourth-generation military engines, although the F119 and F135 actually have quite a few parts produced by General Electric, the revenue The company did not suffer any losses, but the company's stock price has been running at a low level.
This is definitely not good news for the management team.
Of course, General Electric has a great business and will not rush to replace people in a short period of time.
However, at least in the next few years, the company still needs a landmark victory to boost market confidence.
A project that attracts worldwide attention like A3XX is obviously a good opportunity.
"Is this..."
Brad hesitated:
“According to my experience, research work is about maintaining a stable work rhythm. If you blindly increase the workload to advance the research and development progress, it is likely to be counterproductive in the end. "
Just when Goldstein nodded and was about to let the topic go, the other party suddenly added another sentence.
“So... I have to add money!”
“I need to recruit more intern researchers, more experimental samples, and super computing resources!”
< br>
"Yes..."
Good guy, it turns out I want money.
However, for such a project of great importance and bright prospects, General Electric, with its deep pockets, is indeed worthy of those few million dollars.
Seeing Brad who was so motivated and confident, Goldstein also felt a little open about the future, and immediately assured the former:
"Okay, I will apply to the higher authorities after I return, and GE will do its best to support your research!”
"Thank you. It's an honor to cooperate with such a great (money) company as General Electric!"
......
This new set of equipment from Brad's research team is indeed It’s not a waste of money. Although electric heating is not as fast as the traditional method of direct fuel injection and ignition in terms of heating speed, the temperature control accuracy far exceeds the latter. The probability of obtaining valid experimental data has soared from less than 20% in the past to close to 100%. %. Not to mention advanced fully digital monitoring and recording equipment, which can simplify experimental operations to no more than five steps, greatly liberating manpower and reducing many problems caused by human errors.
Therefore, before Brad and Goldstein finished their second cup of coffee, Regina, the female graduate student assigned by the former to conduct the experimental operation, knocked on the door and walked in. .
He also held a floppy disk in his hand.
"Professor, the part of the data you want has come out, and it's all in it."
Brad put down the half-drunk coffee, took the floppy disk, and inserted it into the floppy drive.
Within a few minutes, a black and white temperature distribution map was displayed on the computer screen.
Regina did not leave the office just like that, but introduced to the screen:
"The hot spots on the leading edge of the high-pressure turbine guide vanes will gradually migrate to the outside as the thrust increases. The migration path is slightly different from our previous predictions, but the overall pattern is consistent. In the control group using impingement cooling, the hot spots Although the block still exists, the temperature has dropped a lot compared to the control group.”
Professor Brad’s research group is not small, and the competition pressure is even greater. She certainly wants such a performance opportunity. Take hold.
“The current problem is that after the application of jet cooling, the tip part of the turbine blade will accumulate more heat than in the past. It is difficult to arrange jet slits at this location, and the effect of film cooling alone is also average. , the temperature did not exceed the maximum limit.”
“This is not a big problem. The blade tip area has always been the most difficult area to deal with on turbine blades. The change in the position of the hot spot also requires further testing. The first test can achieve such obvious results, which is very good. At least it proves that our idea of using shock cooling to focus on strengthening is correct!"
Looking at the picture in front of him, Brad was obviously in a very good mood! good.
Is it a big problem if the numerical analysis results are inaccurate?
It is just to provide a reference.
No one can really calculate that it is basically close to the actual situation, right?
No way?
The corners of Brad's mouth curved into a smile of joy.
This means that his research group has reached the forefront of the world not only in compressor design, but also in turbine design.
Even surpassed Oxford University, which provided this MT1 test platform.
“After processing the experimental data and handling the equipment, we will organize a small banquet in the evening to welcome Mr. Goldstein!”
……
< br>It should be said that Brad is quite capable.
He is able to fully consider the complex non-uniform factors at the turbine inlet without relying on experiments, and use impact cooling to deal with them in a targeted manner. He is definitely a hero in the field of aerospace research.
The only flaw is that his calculations were completed before getting the MT1 platform, so the research object has always been individual turbine blades.
Of course this is not Brad's problem.
With the supercomputing level in the late 1990s, relying on normal calculation methods, it was indeed impossible to conduct air-heat coupling modeling of the hot end of the entire aeroengine.
But if he had heard Chang Haonan’s evaluation of the “leftovers” article, he would have realized that impact cooling has its limits.
Adding cooling slots in all hot areas is a headache-inducing behavior, but when it comes to the segment walls, the effect will be very poor.
Therefore, it is not a trivial matter that heat accumulates in the tip portion of turbine blades.
Especially inside a real aero engine.
Since the combustion chamber and turbine structure will be surrounded by the casing, the overall heat dissipation conditions are actually worse than on the experimental bench.
After all, the high-temperature airflow sent out by the combustion of aviation fuel in the combustion chamber is not as stable as electric heating...
(End of this chapter)