The military-industrial scientific research system of the academic master.

People who have not experienced ARJ21 and C919 in the previous life will not know how much China has suffered in obtaining airworthiness certification.

It does not mean that if you use the subsystems provided by Europe and the United States, others will give you the green light for airworthiness certification.

Airbus and Boeing are doing well in their monopoly business, so how can they easily allow a third company to participate?

Although models that have not been approved by EASA and FAA will not be unsaleable, it is indeed very difficult to find large foreign customers.

But the most regrettable thing is not that there was no opportunity from the beginning, but that there was an opportunity but failed to seize it.

In fact, in the late 90s, Huaxia had established quite good relationships with airworthiness certification agencies in many European countries. It had the opportunity to make some breakthroughs while taking advantage of the process of reorganizing JAA into EASA.

However, China's accumulation in the aviation industry in the previous life was indeed too weak, and it was unable to produce any practical technologies that Europe urgently needed like it does now.

More importantly, in the original timeline, in the years at the turn of the century, the domestic civil aviation industry, including the entire CAAC, was in the midst of huge turmoil caused by the failure of the highly anticipated MD90 manufacturing project. , is wavering on whether to build domestically produced passenger aircraft, what kind of domestically produced passenger aircraft, and whether to move closer to FAA or EASA standards.

In the end, this time window was completely missed.

After passing this village, there is no such shop.

By the time the domestic passenger aircraft project, which had been pushed by many parties, finally came to fruition, EASA had long since stabilized and established airworthiness barriers similar to those of the FAA, leaving no room for outsiders to operate.

And now, due to Chang Haonan's own intentional or unintentional operations in the past few months, as well as the occurrence of a series of black swan events, an opportunity to solve this hidden danger from the source has appeared in front of him.

Must succeed!

After the general direction and basic ideas are determined, the only thing left is the specific work.

"I judge that judging from the current situation, the European side should be tempted by Comrade Xiao Chang's idea of ​​focusing on anti-customers during the last negotiation."

Huai Guomo opened the minutes of the first negotiation in front of him and analyzed the crowd:

"But they will definitely have concerns, especially about our technical level in the field of icing and anti-icing. This is the core of the entire plan and a part that Europe has absolutely no control over."

Chang Haonan has naturally considered this issue.

So after Huai Guomo finished speaking, he took over the topic:

"It must be admitted that the overall level of China's aviation industry is not as good as that of Europe and the United States, so from an objective point of view, this concern, or prejudice, is reasonable. Then what we have to do is to use facts to prove our strength. Eliminate their prejudices!”

"Use facts... that means we need to conduct a demonstration test directly for them? Use our aircraft to fly around in SLD climate conditions?"

Currently, the person who is most enthusiastic about the issue of mutual recognition of regional aircraft is Yi Yuanhe. After all, this is directly related to whether the MA-60, which he is responsible for designing, can have a good sales:

"But in this case, MA60 must be further improved. The current anti-icing system design still only considers the 4 types of capabilities in our new standards, that is, the average diameter of supercooled droplets is 100 microns, and the maximum diameter is 200 microns. Not larger than microns.”

Lin Guofan, who was sitting on the other side, also added:

"It's not just a problem for airplanes. Generally speaking, if the humidity is high enough to form millimeter-level droplets, it will have snowed long ago. Therefore, the climate condition of SLD itself is rare, even in the Great Lakes region. It’s already mid-February and it’s almost impossible to find suitable test airspace in the country.”

After hearing this, Yi Yuanhe quickly asked:

"Generally speaking, when will the climate conditions meet the requirements?"

"Basically, it only lasts for three months from the end of October to the end of December every year."

Lin Guofan, who has been tracking domestic low-altitude meteorological conditions for twenty years, replied almost without thinking:

"And it depends on luck."

"But we can't wait another ten months. The revision of SLD's airworthiness standards is an urgent matter and won't be delayed until the end of the year."

"There is no need to wait until the end of the year, or in other words, there is no need to wait for the naturally occurring SLD climate."

Seeing that several other people had already refined the most critical issues with each other, Chang Haonan went straight to the topic:

"If there are no conditions, create conditions. We can artificially create an environment that meets the requirements."

If it had been left to ordinary times, the following people would have already begun to discuss this idea.

But everyone sitting here, at least all the technicians, have seen Chang Haonan's ability in solving the problem of ice on the Y-8 wing.

Not only have wild ideas, but also the ability to turn ideas into reality.

So everyone is waiting for him to give further explanation.

Chang Haonan stood up, pulled out a blackboard placed in the corner of the conference room, and then drew a simple drawing on it.

An airplane, towing a long hose.

When he was done, he gently tossed the chalk into the box next to him and turned around.

Although it is very abstract, people here can still recognize it. It should be an H-6.

"We can modify a H-6 as an icing water jet specially used to artificially simulate ice cloud test environments."

"Because the original design is already quite mature, there is no need to retest the aerodynamic parts of the aircraft, just replace some new equipment."

"For example, the original oil storage tank is changed into a water storage tank, the engine's pressurized air is used as the air source, and the original refueling drogue is changed into a set of flat nozzle arrays to distribute the pressure air and water flow from the air and water system. The air port and water port of each nozzle are supplied to atomize water and form supercooled water droplets in the external low-temperature environment, thereby achieving the purpose of artificial ice clouds."

"The only problem with this improvement is that the size of Hongyou 6 is still too small and the water storage capacity is not large enough. I calculated that it can only work for a maximum of 20 minutes per takeoff. For those icing subjects that require long-term testing It’s still a bit short, but the SLD test is originally about short-term high-intensity icing, so...it’s completely enough!”

"The core of the entire renovation project is the nozzle array. Based on my personal experience, I will temporarily set it as a multi-layer array composed of multiple two-fluid micro-mist nozzles. The crossbar is a double-layer nested air-water pipeline. The cross-section It is circular, the middle keel rod and the frame rods on both sides are only used as support structures, and the cross-section is elliptical. As for the specific array parameter settings..."

Chang Haonan lowered his head and considered the computational difficulty of this problem:

"Give me two to three days and I should be able to give you the design results."