Messerschmitt excitedly said: "Well done! Everyone has worked hard today, let's go to the Senna restaurant to celebrate, where the French food and red wine are very good, let's discuss the follow-up work while eating. ”

Everyone jumped with excitement when they heard that there was a French feast to enjoy and an intoxicating French wine, and the engineers were already hungry after more than four hours of testing this afternoon.

When they arrived at the Senna restaurant, a dozen people sat around a long table, and Messerschmidt quickly ordered the food, and while it was time to serve the food, everyone began to talk about today's test.

Mitchell, an engineer who did not follow the sky, said excitedly: "Mr. Philip, did you really fly to an altitude of 9,000 meters today?" That's a great thing, a proper world record! ”

Philip nodded and said, "That's right! Today we have flown to an altitude of 9,000 meters, and in the future, our M40 transport aircraft will fly to an altitude of more than 10,000 meters, and even future jets will have no problem flying at an altitude of 20,000 meters. So now our problem is that the survival of the human body at an altitude of 10,000 meters, if the cabin is not designed with air tightness, and environmental control equipment such as pressurization and oxygen enhancement is used, then the aircraft cannot carry people to fly so high. Therefore, our M20 transport aircraft can also consider improving the airtightness design of the cabin, and the M40 transport aircraft needs to consider this even more. ”

Everyone was fascinated by this topic, knowing that the airtight cockpit was a completely new thing at this time, and many people had never heard of it.

Mitchell went on to ask, "What is cabin airtightness?" ”

Philip looked at the expectant eyes of everyone and said slowly: "When it comes to airtight design, it involves the basic conditions for the human body to maintain life at high altitudes, and the most important things are temperature, pressure and oxygen. With the increase of altitude, the oxygen concentration and ambient temperature will drop sharply, so in order to achieve high-altitude manned flight, it is necessary to use an airtight cockpit and an air-conditioning system equipped with oxygen pressurization and heating devices, and the realization of airtight cockpit and air-conditioning system depends on the realization of sealing technology. The requirements of the airtight cockpit are: first, the air parameters in the cockpit should meet the requirements of human physiological hygiene standards and a certain degree of comfort, second, the cockpit should have a certain structural strength to ensure the safe and reliable operation of the air conditioning system, and third, the cockpit should have a certain degree of airtightness. ”

Messerschmitt also asked curiously, "Philip, you spoke so well." Let's talk about the specific design of the airtight cockpit, I would also like to know about it. I, the chief designer, am really not competent enough, and I really haven't studied the airtight cockpit. ”

Philip laughed and said, "Mr. Messerschmitt is too good at joking, and you are an absolute authority in this regard, and today I will talk about it with the courage of the class." The change of external environmental pressure conditions of the aircraft during high-altitude flight is very drastic, and the aircraft environmental control system is mainly to control the pressure and temperature of the cockpit and equipment compartment, which should include pressurized cockpit, cockpit air supply and air distribution, cockpit pressure control, temperature control and humidity control. The aircraft pressurized cockpit is adjusted through the cockpit pressure regulating system during the flight of the aircraft, and the cockpit must be kept higher than the pressure of the external atmospheric environment and the pressure environment is in line with the human physiology no matter how high it flies. The sum of the external atmospheric pressure and the residual pressure of the cockpit such as the total pressure of the ambient air in the cockpit, the residual pressure of the cockpit is generally only a few tens of kilopascals. The comfortable cabin temperature is 20 to 25 degrees Celsius. The environmental parameters of the cockpit also include air flow, flow rate, humidity, cleanliness and noise. For passenger aircraft, oxygen supply should usually start from an altitude of about 4,000 meters to increase the oxygen concentration of the air inhaled by the occupants. ”

Messerschmitt thought for a moment and said, "That's right! Then our M40 transport aircraft must consider these things, because it will become a passenger aircraft in the future. I think that the compressed air from the turbocharger can be used for pressurization and ventilation purposes, and the air supply duct can be transported to various parts of the cabin. This turbocharger is really useful! ”

Philip nodded, "That's right! It is true that the turbocharger can be used to draw air into the cabin for pressurization, of course, if the compressed air of the turbocharger is insufficient, a special booster air pump can be used, and the air supply conditioning device, air filter and silencer must be installed. In addition to pressurization, the temperature of the cockpit is always kept at a comfortable temperature of more than 20 degrees Celsius by using a heat exchanger, and the cabin temperature can be controlled by making full use of the engine heat generated by the engine's cooling system, and the cabin temperature can be controlled by hot air flow. Just in case, it is also necessary to prepare an emergency oxygen supply system for passengers to prevent the danger caused by loss of pressure in the cabin. ”

Everyone listened with relish, and they didn't realize that the dishes had been served, and they didn't come back to their senses until the waiter reminded them.

Messerschmitt exclaimed, "Come on, come on!" Let's eat the vegetables first, and there is a delicious Bordeaux red wine, so let's enjoy it. ”

Philip pointed to a plate of black pastry in front of him and asked, "What kind of dish is this?" ”

"Orange French foie gras!" Messerschmidt replied with a smile.

"Orange French foie gras? Good stuff, then I'll have to try it! Philip said, forking a piece with a fork, and saw that it really looked like a black patty: "This foie gras looks delicious!" ”

After saying that, Philip put the fork in his mouth, and as soon as he took a bite, the satisfaction on his face spontaneously appeared: "Well, not bad, not bad, really good!" Then he said to the people, "Come, come, you all taste it, it's delicious!" ”

Messerschmitt laughed: "Of course, this is a famous French dish. The first people to know how to cook fried foie gras were probably the Romans more than 2,000 years ago. After more than a thousand, in the time of Louis XVI in France, foie gras was deeply loved after being paid tribute to the court, and since then it has become a treasure widely adopted by the court. Many well-known musicians, writers and celebrities of the time competed to praise it, and since then it has established itself as a top cuisine. ”

Immediately afterwards, Philippe and others tasted French stewed potatoes, French steak, French lamb saddle steak, etc., and everyone was full of praise for the French cuisine here.

Messerschmitt raised the goblet containing a small half glass of red wine in front of him and said loudly: "Come, come, come!" To celebrate the first successful test of our turbocharger, we toast! ”

Before Philip could swallow the food in his mouth, he had to raise his glasses, and everyone clinked glasses in a warm atmosphere, and then they all drank it up, but the red wine just rushed a large gulp of food into the stomach, but did not taste the taste.

When the waiter poured a small glass of Bordeaux red wine for everyone, Philip also raised his glass and said loudly: "Everyone, I wish our Messerschmitt Aircraft Company and Dragon Soul Aircraft Manufacturing Company a better future, everyone here has a bright future, cheers!" ”

In a joyful and enthusiastic atmosphere, everyone discussed turbocharger testing and the design of the airtight cockpit while enjoying a delicious meal.