Aerospace

The most commonly used tools for air transport are aircraft and airships, but the aircraft is too expensive and the airship is too slow. What would it be like to combine the two? Recently, a company called the Ohio Airship Company in the United States built a new type of aircraft called Dynalifte. It combines the characteristics of an airplane and an airship: the fuselage is filled with helium and can provide 30%-80% of buoyancy; it is equipped with an engine that can take off and land on land like a normal airplane. However, compared with aircraft, the fuel consumption is only 1/3 of the latter. At the same time, the cost of manufacturing Dynalifte is much lower than that of large transport aircraft. The most important thing is that the ground runway requirements are quite low, only a fraction of the length of ordinary aircraft. Will suffice. Such remote areas can also land large aircraft.

At present, the Xenon aircraft (for the time being) is still in the experimental stage. It is estimated that the prototype will fly into the sky next year. The person in charge of the company revealed that this time it is only a test. Once the test is successful, they will build a larger Xenon aircraft. It may change the pattern of the global aviation industry.

What are the components of the gas in the Shenzhou spacecraft cabin?

  Air composition: 20.93% oxygen, 78.03% nitrogen, 0.98% rare gas, 0.03% carbon dioxide, 0.03% other. Obviously, oxygen and nitrogen account for 98.96% of the total, so the gas in the cabin is mainly composed of oxygen and nitrogen.

 The air that the crew breathes is provided by the titanium alloy “oxygen cylinder” and “nitrogen cylinder” carried by the spacecraft. Through the pressure regulation system installed in the cabin, the tank is continuously supplemented with oxygen and nitrogen to ensure a constant atmospheric pressure. The air in the cabin must be fresh, which is the first element. The ventilation and purification equipment in the cabin continuously filters and purifies the exhaust gas such as carbon dioxide exhaled by the astronauts.

There is a person on the spaceship, and the humidity problem will follow. People breathe and sweat every day to produce more than 1 kg of water vapor. These water vapors form a fog on the bulkhead and instrument surface of the spacecraft, and the electrical equipment is short-circuited. Therefore, the cable and connector in the cabin have waterproof function; the fiber fabric similar to the baby's diaper is used as the bulkhead interior to absorb water and absorb moisture.

(Note: God five returned to the ground, opened the hatch door, a pungent smell, the main component is carbon monoxide, which is fatal to the astronauts. This harmful gas mainly comes from two places, one is the cabin fire The gas leaked from the working hours of the product, and the second is the discharge of harmful gases from the non-metallic materials in the cabin. Later, improvements were made to realize the one-way venting technology that not only ensures the sealing of the cabin but also eliminates harmful gases.

(On the ground, the cabin is filled with gas, and the titanium alloy cylinder is filled with high-pressure gas. After the day, the gas is regulated by a pressure regulating device. Excluding carbon dioxide, inputting fresh gas, maintaining an atmospheric pressure and air freshness)