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A pickle jar can function as a tiny jet engine. The setup is simple: a glass jar with a small hole in the lid holds a volatile fuel like methanol, which evaporates to create a fuel and air mixture inside. A flame brought to the hole ignites it, and... the cycle begins. Here is what happens in each pulse. Combustion sends a sharp pressure spike through the jar, forcing hot gas out the lid hole as thrust. The escaping gas creates a brief partial vacuum inside, which pulls fresh air back in through the same hole. Residual heat ignites the new mixture automatically, and the cycle repeats dozens to hundreds of times per second. The jar and hole act as a resonant cavity, which is why it pulses instead of burning steadily. A single opening cannot handle exhaust and intake at the same time, so the system locks into a natural rhythm. It produces almost no real thrust, but it is a clear window into how actual pulsejet engines work, and the physics on display are the same ones used in real aerospace propulsion. Follow for more!show more

Mechanical Knowledge

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131,156 просмотров • 3 месяцев назад •via X (Twitter)

Образование Наука и технологии

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A spark plug is a small device in a car’s engine that creates a tiny electric spark to ignite the fuel and air mixture inside the cylinder. This spark is what makes the engine start and keep running. Without spark plugs, gasoline engines wouldn’t work

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Forget matches; this is how our ancestors used the laws of thermodynamics to start fires in seconds using nothing but wood and air. The secret lies in the sudden increase in pressure. By trapping air in a narrow tube and forcing a piston down, you are doing work on the gas. In a closed system like this, that work translates directly into thermal energy. Because the movement is so fast, it is considered "adiabatic," meaning no heat escapes. The resulting flash of heat is intense enough to create a glowing ember, which is then transferred to a larger "tinder bundle" and blown into a flame.

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The F-16’s afterburner boosts thrust by injecting additional fuel into the exhaust stream after the gases have already passed through the turbine. This creates a second stage of combustion that dramatically increases engine power. In normal operation, the engine compresses incoming air, burns it in the main combustion chamber, and uses the resulting energy to drive the turbine. The hot, high-speed exhaust then flows into the afterburner section, which contains flame holders—metal structures designed to stabilize the flame in the fast-moving airflow. When the pilot engages the afterburner, fuel is sprayed into this exhaust stream and ignites almost instantly. Because the exhaust still contains unused oxygen, the added fuel burns intensely, causing the gases to expand and exit the nozzle at much higher velocity. To maintain smooth airflow and prevent excessive pressure buildup, a variable-area nozzle opens wider. The outcome is a massive thrust increase—often 50% or more—accompanied by the bright, fiery plume that appears when the afterburner is active. 🔥✈️ 📸 by ig/fighteraircraft

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