Chapter 1541: Find the reason

At this time, the speed of the aircraft was very fast. At high speed, when the front wheel was tripped by the ridge, the nose flipped over, like a big head tripped over.
The belly of the plane was facing the sky, the back of the plane was facing the ground, and the whole plane buckled forward, rubbing out sparks on the ground.
Suddenly, a big stone appeared in front of him. The cockpit cover collided with the big stone, and it was immediately shattered. The test pilot Belyakov in the cockpit looked at the big stone, his pupils widened and his mouth widened. There was only time to make a voice: "Long live the Soviets!"
The plane did not catch fire.
When the people from the base arrived, nearby villagers had already rushed to watch. They carried water to extinguish the small flames. They looked at the almost disintegrated airframe and the pilots who were hit beyond recognition.
Mikoyan also caught up, his face was ugly, his legs were trembling, and he failed. This time the flight test failed again. What was the reason?
Moreover, it also caught the life of Belyakov.
"Take the plane back, disassemble and study." Gromov also came up, the muscles on his face jerked, and his eyes showed firmness again.
As test pilots, they are accompanied by danger. When needed, they know that they are dead and have to conduct test flights. This is their mission.
At the beginning, Gromov was like this.
When the plane is on the ground, it can still burn steadily. Why does it suddenly turn off when it is in the air?
This is a problem that must be solved.
They moved quickly. When the engine was returned to the flight test center, they immediately dismantled it, and finally found the reason. In an oil pipe, an icicle that had not completely melted appeared.
"The temperature in the high altitude is low. Almost every one kilometer rises, the temperature will drop by six degrees. When the plane rises to an altitude of three kilometers, the temperature has dropped to zero degrees. In this way, the water in our alcohol begins to solidify." The reason was finally found out, and it was found at the cost of the test pilot's life.
Experiments on the ground will not cause such problems. Only at high altitude will the fault be revealed. This has become the first problem before everyone.
The flying altitude of the aircraft is very high. The MiG-3 can jump up to 10,000 meters, where there can be dozens of degrees below zero. You use alcohol instead of gasoline. The first problem is that the water inside has solidified and blocked the fuel pipe. ?
There are two solutions.
"On the one hand, we can transform the fuel tank and tubing into heating, so that the internal temperature is higher than zero, so that it can be used normally." An engineer said.
Fuel tanks and tubing heating have already been applied on a large scale in later generations. Heavy trucks burn diesel oil, and diesel fuel will wax at low temperatures, so low-grade diesel must be used, but this diesel is expensive and is not resistant to burning. So there is a means to heat the fuel tank and fuel pipes, which can burn normal zero diesel.
It is not difficult to say, just change to electric heating, but in actual operation, there will be problems.
Electricity on airplanes is precious, and electric heating consumes a lot of electricity. What's more, their fuel is alcohol. Once there is any failure, it may directly catch fire.
Moreover, it will also cause the internal structure to be complicated. They have to make major changes to the existing aircraft, including all the fuel tanks and fuel pipes, but it is a lot of work.
Therefore, everyone shook their heads when they heard this plan. It does not meet the current needs. What they want is to make small changes to the aircraft. It is best to change the aircraft without modification. It is definitely not almost necessary to take the aircraft apart and replace Heating oil tank and heating oil pipe.
This is inappropriate.
"Another solution is to increase the purity of the alcohol, so that the alcohol content is higher than 99.9%."
Since heating the fuel tank tubing is inconvenient, try to improve the purity of the fuel.
Several tons of vodka have been consumed, but vodka with a purity of only ninety-five is still not enough, so just continue to increase the purity and make it so high that almost all of it is pure alcohol.
In this way, the moisture content inside is quite scarce, even if it is solidified in the air, it will not block the oil pipes, and after entering the carburetor, it is already close to the engine, and the engine’s own heat is enough to melt it away.
Improve the purity of fuel! Hearing this suggestion, Mikoyan nodded: "This is a feasible plan. Give this task to the winery and let them find a way to meet our requirements."
"In addition to this, based on the recording equipment on the plane and the report of Comrade Belyakov during the test flight ~ EbookFREE.me~ we found that as the aircraft continued to climb, the power began to drop significantly. We have calculated that the calorific value of alcohol is smaller than that of gasoline. In order to get more power for the aircraft, we need to adjust the amount of fuel so that more alcohol enters the cylinder for combustion."
The Soviet aircraft designers found the right solution.
The use of alcohol instead of gasoline has also happened in history. It was in the northeast of China. It had just been liberated and got a group of aircraft from island countries, but there was no gasoline. In order to train China’s own pilots as soon as possible, Zhu Comrade Rui provided Comrade Jiang Tianran, the deputy director of education of the aviation school, with a top-secret data on the Japanese army and more than a dozen barrels of alcohol used in the experiment.
At that time, the island nation’s trial of using alcohol to replace aviation gasoline was unsuccessful. The main reason was parking in the air, and 31 people were killed during the trial. After Jiang Tianran reported this situation to school leaders Chang Qiankun, Wang Bi and other comrades, he proposed that China itself continue to conduct alcohol substitution experiments.
After hundreds of experiments and analysis, they finally figured out the reason for aerial parking: it turned out that the amount of energy released by burning alcohol is less than aviation gasoline. The solution to the problem is to improve the purity of the alcohol, modify the engine nozzle, increase the amount of alcohol sprayed, and make the alcohol combustion heat the same as gasoline. In the end they succeeded.
Historically, island countries lacked fuel, but the Soviet Union did not lack it. But now, the real dilemma has forced the Soviet Union to change its thinking and find alternatives.
They are using alcohol instead of gasoline, which is their best plan, and now, when Germany has begun to attack Moscow, they finally found the right solution.
Only by letting the fighters continue to fly can they fight the Germans in the air and better protect the land battlefield. Without air supremacy, there would be nothing.