Chapter 213 Some Little Oriental Shock
Chang Haonan’s loud words made the entire negotiation venue instantly quiet.
Actually, before this negotiation, the Chinese side did not know the specific reason why the European side suddenly came to cooperate, so there was no way to prepare in advance and could only bring in relevant technical personnel. Break up the moves.
So except for Huai Guomo, who had just seen the note, and Lin Guofan, who had participated in the research, everyone showed expressions of disbelief for a moment.
People here in China don’t know that they are so awesome.
Even the recorders on both sides had difficulty judging how to record this content, so they had no choice but to raise their heads and look at the speaker who seemed to be "talking wildly".
After a brief moment of silence, the European delegation opposite quickly started discussing among themselves.
One of the old men with silver hair and glasses stared at Chang Haonan for a while before asking.
“I’m sorry, I need to confirm again. When you say SLD conditions, do you mean supercooled droplets with millimeter-sized particles?”
This guy also looks like a The technical staff, mainly because their eyes do have the look of a mad scientist after seeing a research subject.
"Of course, and I can reveal some more precise information here."
Chang Haonan, who had already expected to face similar problems, nodded and replied almost without thinking:
"Specifically Said, "We have conducted theoretical and engineering studies on the phenomenon of large-scale droplets with particle sizes ranging from 400 microns to 1 mm impacting solid surfaces at high speeds."
"The current results show that large-scale droplets and past research. The icing mechanism of ordinary droplets below 100 microns is very different. Some basic assumptions in the past, such as 'the water droplet impact process does not produce thermal motion', are no longer applicable under SLD conditions. Therefore, a whole set of new research needs to be created. Methods, and even theoretical systems.”
After hearing what Chang Haonan said, the white-haired old man became obviously more excited:
"Then what method did you use to explain the impact mechanism of typical critical ice shapes on the aerodynamic performance changes of airfoils? In addition, from the perspective of airworthiness and safety, is there any method to evaluate the specific aerodynamic characteristics of airfoils after icing..."< br>
“Ahem——”
Before the series of questions were finished, they were interrupted by a light cough.
To be able to ask such a question at the negotiation site is simply outrageous.
Chang Haonan narrowed his eyes slightly and glanced at the name tag in front of the other party——
Fernando Lorenzo.
Chang Haonan vaguely remembered that he had read a paper written by this person in his previous life, but he could not remember what it was about.
"Mr. Lorenzo, I think I need to remind you that this is not an academic seminar, but a negotiation site. If you are really interested in these issues, then wait until an agreement between us is reached , I will be happy to share these research results with your technical staff.”
The few words just revealed are just to convince the European delegation that China has really researched the SLD icing problem.
Judging from the other party's reaction, there is no doubt that the goal has been achieved.
Then of course he couldn't reveal any more information.
After Chang Haonan said this, Lorenzo also realized that the situation was not right and showed a somewhat embarrassed expression.
However, as the delegation's technical advisor, he did not have decision-making power, so he turned to look at Rosie Colombo and Anne Valette sitting in the middle with questioning eyes.
Although Aerospace France and Airbus also sent representatives to participate in this negotiation, as peers and competitors of China Airlines to a certain extent, they were obviously not as good as Finland in this negotiation based on cooperation. The people from Mechanica and JAA play a greater role, so these two people are considered the core members of the delegation.
However, even for Colombo, who has participated in the entire MA60 icing test, the amount of information he came into contact with tonight was indeed a bit too much.
If what the Chinese said is true, then their research in the field of icing and anti-icing has even reached the front of the Americans.
They had never thought about rebelling against General Yijun before, and were naturally unprepared for the relevant negotiation conditions.
And neither Colombo nor Valette are full-time technicians. They only have some understanding of SLD-related fields, and they cannot make decisions on the spot. So the two looked at each other and saw the same meaning in each other's eyes.
“As for the idea just put forward by your delegation, we need to report it to the European headquarters, and we are temporarily unable to give an accurate answer.”
After being shocked by Chang Haonan's blow to the head, Valette's tone was no longer as sonorous and powerful as it was at the beginning.
Her speech means that she is ready to end this round of negotiations.
Considering that the things that both sides want to discuss are no longer on the same level, and China also needs to confirm some technical details with Chang Haonan and Lin Guofan, this is actually the only way out.
It’s just a matter of seeing which side can’t hold back first in the end.
Now that the European side takes the initiative, it is naturally the best.
So the first round of negotiations came to an end.
Then naturally there was the dinner party that had been arranged long ago.
Although after determining the reason for the other party's request for cooperation, Huai Guomo and others had many questions to consult Chang Haonan and Lin Guofan, but they still had to complete the necessary procedures.
During the dinner, in addition to his old acquaintance Colombo, Chang Haonan also chatted with Fernando Lorenzo and learned that the other person was a professor from the National School of Roads and Bridges in Paris, and his research direction was discontinuation. Body mechanics and fluid mechanics.
France’s universities are more casual in their naming. Although this National Road and Bridge School sounds like a junior college, it is actually one of the top 100 science and engineering universities in the world. In the 1990s, it was even more prestigious than Huaxia University. All schools within the continent are ranked highly.
"Chang, have you Chinese built an icing wind tunnel like NASA?"
Lorenzo is obviously still very interested in the research Chang Haonan just mentioned.
“Professor Lorenzo, icing wind tunnels like the Lewis Center are indeed important, but their main role is still focused on testing the aerodynamic characteristics of the airfoil after icing, and the research we are currently conducting is More fundamentally, it starts with the process of supercooled droplets hitting the surface and deduces the entire process of freezing."
Chang Haonan held up the wine glass filled with white grape juice with one hand and held it in mid-air with the other hand. He gestured a few times:
“Due to the limitations of current wind tunnel technology, the influencing parameters that can be obtained by the experiment, the scope of the experiment, and the versatility of the research methods are all limited. Therefore, in this field, we mainly rely on Computational fluid dynamics technology for numerical analysis and test flights of key research conditions.”
"Test flight directly after numerical calculation..."
Lorenzo looked incredulous:
"Wouldn't that be very dangerous?"
"It is indeed very dangerous."< br>
What the old professor didn’t expect was that Chang Haonan admitted this point directly:
"So we will first select the most reliable working conditions for test flight. After verifying that the simulation results within this range are OK, we will gradually increase the severity of the test flight environment."
This series of answers is true Even if Lorenzo went to Colombo for verification later, he would not be able to tell anything fishy.
For example, they have actually only conducted test flights in a 100 micron level supercooled droplet environment before, but the theory that Chang Haonan and Lin Guofan worked out before can indeed predict icing under SLD conditions relatively accurately. The situation just requires some adjustments to some theories and assumptions.
The reason why I didn’t go on a test flight is because SLD actually has a very extreme climate, and it is basically a once-in-a-century climate in China.
It is not impossible to adapt the aircraft to such conditions, but it requires all aspects from airfoils to skin materials to anti-icing devices. The cost is extremely high and it also affects the performance of the aircraft. It is really better to be honest. Strengthen the level of weather detection and ground the flight directly once such weather is discovered——
In fact, this is also the common method in later generations.
But now that the FAA is going to use SLD as a bargaining chip 15 years in advance, Chang Haonan doesn't mind giving them a little oriental shock.
(End of this chapter)