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: Guangming.com
Whether you are fighter pilots, bombers or reconnaissance pilots, they wear oxygen masks when they take off to perform combat missions. This is because as the flight altitude increases, the air density decreases, and the oxygen content in the air also decreases. When it decreases to a certain level, the pilot will be slow due to lack of oxygen and lack the correct perception of the air situation. Judgment, unable to perform the scheduled task correctly, severe hypoxia will cause loss of consciousness and endanger flight safety. Therefore, for flight safety considerations, pilots must wear oxygen masks when the flight altitude is greater than 4000 meters. Some aircraft cabins are sealed and oxygen can be supplied to the cabin. Even so, for safety considerations during combat, pilots must also wear oxygen masks to prevent the cockpit from rupturing and depressurizing due to enemy attacks during combat, and there is no time for oxygen supply. Pilot hypoxia problem.
In the past, oxygen cylinders were used to supply oxygen to the pilots on airplanes. Due to the long range and long endurance of modern combat aircraft, it is impossible to carry many oxygen cylinders on the airplane. In order to ensure the oxygen supply, the oxygen cylinders generally use compressed pure oxygen. , The oxygen supply system provides pure oxygen at a certain pressure to the pilot, so the oxygen supply of the oxygen cylinder limits the aircraft's continuous air combat capability to a certain extent. In order to solve this problem, modern combat aircraft have been changed to install oxygen generators on the aircraft and make their own oxygen during the flight, thus breaking the limitation of the oxygen capacity of the oxygen cylinders, and can supply almost unlimited air to the personnel on the aircraft to provide life support. . The oxygen produced by the oxygen generator is generally pure oxygen. The pilot can manually select the way the oxygen system supplies oxygen to the pilot in the air. When the switch is set to the "pure oxygen" position, the system will provide pure oxygen to the pilot; set the switch to " In the "Mixed Oxygen" position, the system provides the pilot with mixed oxygen close to the natural state. Therefore, the pilots of modern fighter jets are no longer completely inhaling pure oxygen in flight. Instead, they can breathe in a very close to natural state and fight freely at any altitude during combat.
Source: Popular Science China-Frontiers of Military Science and Technology
