A big country of aerospace with black technology

The 500-second experiment did not meet Zhang Xingyang's expectations.

When running to the 407th second, the turbine blades deformed visible to the naked eye under the violent impact.

If the controller in charge of controlling the inflow of fuel hadn't had quick eyes and hands, it is estimated that the entire turbo pump and gas generator would explode in an instant.

Geng Bo's expression was a little frustrated, not because he lost the bet, but because he regretted that he still didn't have a turbo pump that could last for 500 seconds.

"Remember you owe me one hundred yuan." Zhang Xingyang patted Geng Bo's shoulder and said with a smile.

In fact, in this experiment, Zhang Xingyang's psychological expectation is that the whole system can run for 200 seconds to be considered a victory.

After all, in fact, from the ignition to the separation of the first-stage rocket, it is difficult for the turbo pump to work for more than two hundred seconds.

If the problem of repeated use is not considered, the service life of two hundred seconds is actually completely sufficient.

However, Zhang Xingyang still let them extend the service life as much as possible out of the consideration of recyclable and reused rockets in the future.

Although recyclable rockets are not a particularly feasible solution in this era, it is still various space shuttles that are in the limelight.

But Zhang Xingyang is very clear that the technical route of the space shuttle has far more technical and safety problems than recoverable rockets.

And the space shuttle is not as cheap as Yingjiang claimed at the beginning. NASA once predicted that the cost of launching a space shuttle would be around 10 million.

But the actual launch cost reached about 400 million US dollars, which was not only much higher than the recyclable rockets that became popular later, but also had no price advantage compared with the current rockets of Maoxiong's family.

Although there is still no conclusion in China on which method to reduce costs in the future, Zhang Xingyang has actually secretly started various preparations for low-cost recyclable rockets.

"Xing Yang, what do you think is the reason why the experiment time did not reach 500 seconds?" Geng Bo frowned and asked with his right hand fisting his chin.

"It should be that the material processing and molding are not in place." Zhang Xingyang thought about the possibilities in various aspects, and said not particularly sure: "You can go to Su Xiao and Qiao Yang later and ask them to do it. Mechanical analysis and metallographic analysis."

That night, three sets of turbopumps and gas generators, including the last turbopump that was scrapped, were transported overnight to the test center of the Rocket Research Institute.

The materials laboratory of the Rocket Research Institute has been very busy recently. After all, they not only need to be busy developing various new materials for new engines.

And they also undertake the exhaust nozzle research project in the WS-10 project jointly developed with the military.

Although the materials in this area only need some improvement on the original process, such an experiment is not particularly brain-intensive, but it consumes everyone's patience and physical strength.

However, the research priority of the new engine is still higher within the research institute.

Even though most of the staff were busy with the WS-10 project, Su Xiao still took out half of the staff to test the various parts of the turbo pump that completed the experiment.

"Su Xiao, I'm sorry, I'm taking everyone to do the test at such a late hour." Zhang Xingyang said to Su Xiao and the staff she brought with a little apology:

"Thank you for your hard work, I have already notified the cafeteria, and I will give you extra meals later!"

Everyone present cheered, and then threw themselves into the intensive testing work.

The turbo pump is mainly composed of two parts, which are responsible for pushing high-pressure gas to pressurize the fuel and delivering fuel and oxidant.

In this 500-second experiment, the problematic part was the rotor blade part of the turbine.

Generally speaking, blade cracks, machining tool marks, and rotor material defects caused by the failure of the turbo pump section seal are the fatigue sources of the rotor blades.

When the rotor rotates at high speed, the turbine blades are subjected to alternating loads, resulting in fatigue damage and fracture.

The people led by Su Xiao are doing the metallographic analysis of the material, so as to explore whether the fatigue damage is caused by the problem of the rotor material itself.

The supper at the Rocket Research Institute is very hard-core. There are large pieces of mutton on the long red willow branches.

This means that most of the researchers in the research institute are young people, otherwise the stomach would not be able to bear so much mutton.

Zhang Xingyang held a string of mutton skewers, and while watching Qiao Yang doing finite element simulation analysis on the computer, he bit down a piece of mutton.

The freshly baked mutton tastes just right, fragrant on the outside and tender on the inside. Zhang Xingyang couldn't help but give a thumbs up to the barbecue chef in the cafeteria in his heart.

What Qiao Yang is currently doing is still the previous mechanical analysis of the turbo pump to see if it is deformed due to the fracture caused by the alternating load.

Zhang Xingyang took a bunch of mutton skewers and handed them to the busy Qiao Yang:

"Try it, the freshly baked lamb skewers are very fragrant."

Smelling the smell of grilled cumin, Qiao Yang, who was not particularly hungry at first, felt his stomach wriggling, so he took a bunch of mutton skewers and ate them.

"It's really not bad, thank you Brother Xingyang." After eating a bunch of mutton skewers, Qiao Yang talked about the simulation problem:

"From the simulation model, the reason for the deformation and fracture of the turbine blades this time is indeed because the blades have been subjected to large alternating loads."

This result is not particularly surprising to Zhang Xingyang. After all, the reason for the deformation of the blades is very small except for the alternating load.

At this time, Su Xiao's test results also came out.

"Alternating load is indeed one of the causes of fatigue fracture, but when we conducted material metallographic analysis, we found that there is a phenomenon of stress concentration in the blade body of the turbine blade, which is also the cause of the fracture of the turbine blade."

While looking at the document in his hand, Su Xiao reported the result of the test to Zhang Xingyang.

"Thank you for your hard work, everyone. Go eat supper first, and go back to rest after eating." Zhang Xingyang said while flipping through the documents and eating mutton skewers.

Su Xiao looked at Zhang Xingyang with complicated eyes, then turned and left.

Although he caught a glimpse of Su Xiao's small eyes, Zhang Xingyang didn't pay much attention to it.

It's not that he doesn't understand that Su Xiao has some strange feelings for him, but he has no plans in this regard yet.

In this era, there are so many things I need to do, but my time is limited, and it is impossible for me to devote my limited time to my children's affair.

Putting his thoughts on Su Xiao behind him, Zhang Xingyang went on to look at the metallographic analysis documents.

The dawn sun has not yet risen, but those who have not slept can already feel the morning sun.

Just like a country in this era, although it is surrounded by various "collapse theories", its rise is imminent.