"What?!"
Di Wu didn't hear Li Ang's words clearly and lowered his head and shouted.
Li Ang shouted loudly: "All fumaroles are in groups of two! Find a way to grab the hollow metal plates above the holes on both sides, turn them on and off, and repeat several times, maybe you can stop the strong wind from spewing out!"
"How did you..."
Di Wu's voice was covered by the wind. He glanced at the people struggling to support him, gritted his teeth, raised his shield, moved forward, and came to Zhu Yuyin's side.
Following Li Ang's instructions, he squatted on the ground and opened the closed hollow metal plate, and pulled down a metal plate next to it.
Just like before, the second metal plate that was pulled up was accompanied by a rolling sound. The wind first weakened and then strengthened.
After repeating it more than ten times, the sound of something breaking suddenly sounded in the space behind the metal plate.
The holes corresponding to the two metal plates no longer gush out strong wind.
‘It works!’
Di Wu stared in astonishment and waved to the other people on the ground. They all crawled forward and continued to close the second, third and fourth groups of Qi channels.
A quarter and a half later, all the Gangqi channels close to the surface were closed, and the Gangqi vortex lingering in the hall also weakened a lot. Only the Gangqi vortex remained under the dome.
The people who narrowly escaped death opened Zhangdao Guirong's respirator that had exhausted its gas, and lay on the ground breathing heavily.
Di Wu, who had wounds all over his face and body, came over, cupped his hands towards Li Ang, and said in a respectful tone: "Li Xiaolangjun, how did you..."
"How do you know that repeatedly opening and closing the hollow metal plate can close the gas channel?"
Zhu Yuyin, who was also slightly injured, walked over and asked directly.
Li Ang glanced at him and did not answer directly, but said slowly: "Have you ever driven a big boat on the river?"
Zhu Yuyin was stunned when he heard this, "What?"
"If you have extensive boating experience, you should know that two boats cannot sail too close side by side in still or moving water——
Once this happens, the two ships will approach each other uncontrollably and collide.
If two ships are sailing in tandem, the situation will be even more dangerous. The ship behind will hit the ship in front under the action of the current."
Li Ang said casually and said silently in his heart, in water or air flow, if the speed is small, the pressure is large, if the speed is large, the pressure is small - this is the basic theory in fluid mechanics, Bernoulli's principle.
If two balloons are hung on a rope, close to each other but separated by a distance, and blow air toward the middle, the two balloons will approach and collide with each other due to the fast air flow and low pressure in the middle.
In the memory of another world, the same principle is used to draw warning yellow lines on high-speed rail platforms - if you approach a high-speed train, you will be "pushed" towards the train by the sudden decrease in air pressure, causing an accident.
"The principle of those holes is basically the same.
Look carefully at the holes on the wall. They are all in groups of two, with a hollow metal plate above them.
When a metal plate is closed, accompanied by the sound of bones in the mountain wall, the wind first weakens and then strengthens. The wind no longer comes out of the adjacent holes."
Li Ang said casually: "The wind force changed after the rolling sound was made. I guess that the two adjacent holes each have an air intake channel.
The two passages meet in a chamber and lead to the source of Gangfeng."
Li Ang casually drew a "丄"-shaped diagram on the ground and said: "In the depression of the chamber, there is a spherical object - probably some kind of solid stone ball or iron ball.
The object is located in the recess of the chamber and does not move normally.
When the hollow metal plate on the left is closed, the airflow in the chamber will preferentially flow out of the hole on the right.
The air flow on the right side of the chamber accelerates and generates force, as if it 'sucks' the stone ball up, rolling and blocking the air flow channel leading to the hole on the right side.
At this time, the airflow in the left hole is weakened due to blockage - that is, the initial windless period.
But soon, as the airflow continued to enter the chamber,
The hole on the right side has been blocked by stone balls, so the remaining air can only flow out to the hole on the left side, causing the gas flow rate in the hole on the left side to increase instead of decrease.
To put it simply, the stone ball in the chamber is a direction selector. Which side is blocked, the airflow on that side will be enhanced.
What I asked Di Wu to do was actually to roll the stone balls back and forth in the chamber, use the gas to destroy the stone balls, block the air flow channels on both sides, and reduce the air outlet volume on both sides."
Di Wu and others felt that they understood, but they did not understand.
Li Ang glanced at Zhu Yuyin and said: "Of course, your method of changing the position of the pattern according to the sixty-four hexagrams may also be effective.
In short, as long as you can survive.
However, because in each chamber, the stone balls may be further crushed at any time, causing the strong wind to be generated again.
Better act soon."
Hearing Li Ang's words, Jiao Cheng pursed his lips and stood up from the ground.
The Broken Dragon Stone at the entrance of the corridor is indestructible. Several tattooed men and two sword cultivators tried it, but they were able to break it open, but the time it took was unknown.
And the earth-melting talisman they brought was quite slow to take effect.
After Jiao Cheng thought for a moment, he left the five people in place and continued to use the melting earth talisman to melt the rock formations around the Broken Dragon Stone. They must find a way out when the Gangfeng is regenerated.
The remaining people went to the center of the hall and found that the bronze door in the middle of the hall was embedded in a rotating ring.
After prying open the bronze door, I didn't see the stairs leading down, but instead saw a pool of thick, dark liquid that exuded a pungent smell.
"This is... Shizhi?"
Jiao Cheng was so shocked that he took the bamboo pole handed to him by his subordinates, put it into the oil layer, and stirred it.
Oil is viscous, has no outlet, and has no hidden compartments.
What's under the bronze door is really just a pool of oil.
"Where's the road?"
Jiao Cheng clenched his fists and glanced around.
The cave hall has only mountain walls without any obstruction. Judging from the sword-marked poems on the dome, it is undoubtedly the work of the banished immortal.
But what about the most critical path?
Jiao Cheng asked his men to carefully search for traces around them and try to push the ring around the bronze door, but this only made the oil pool rotate.
"Is it possible to light the stone fat in the pool?"
Jiao Cheng muttered to himself, still unable to make up his mind.
Oil is flammable and difficult to extinguish. If you ignite it rashly, you don’t know what the consequences will be.
"..."
Li Ang looked up at the dome and suddenly said: "Is that amber on the dome?"
"Huh?"
Jiao Cheng and others looked up following Li Ang's gaze, and saw that the dome above the bronze door was faintly flashing with brown light, like a ball of amber, with a long shadow of iron rope condensed in the middle.
"If the road is on the dome, the stone fat pool must be lit to melt the amber above?"
Li Ang estimated the distance to the dome and the influence of the upper wind, and suddenly realized the role of the rotatable ring around the oil pool, and murmured: "So that's it..."
This chapter has been completed!