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What are Hot Air Engines

What are Hot air engines actuallythat is a question that is always asked if we have an exhibition.They are always scolded for steam engines.but they actually have nothing to do.The machine `s are supplied with heat, which may be fire, wood, coal, gas, radiant heat or sun `s heatand the machine is cooled. by air or water

The hot air engine always has two piston `s and one or two cylinder` sAn exception to this is the so-called VACUUM engine or flame eater but that later.There is always a so-called power piston and a displacer piston,they can be bundled together in a cylinder or each separately in a cylinderThe power piston has a close fit (at an open cylinder the piston passes through the cylinderon one side closed cylinder the piston remains stuck in the cylinder).the displacer piston has a loose fit of approximately 0.5 mm to around in the cylinder.this is necessary to move the air during the workingBy heating of the displacer cylinder the air in the cylinder expandsthe displacer piston is pressed away by the expansion of the air.because the turns ratio is almost 90 degrees between the two piston `s (see Example 1) starts the working piston the pressure to increase as the displacer moves backThe air is cooled again by the cooling fins, shrinks and then there arises a vacuum and then start the game again, because there is always a flywheel available.Without the flywheel the Hot Air engine will not work.

Example 2 shows how the hot air engine workson one cylinder and two piston `sThe operation is equivalent to a two-cylinder engine.The power piston used the piston rod of the displacement piston as a guide,and a double control on the flywheel with a displacement of 90 degrees

The so-called Vacuum engine or also called FLAME LICKER is a one cylinder and a one piston engine (see example 3) If the piston is in the upper position and goes bags there is also a valve open. Because of this valve the flame is sucked in by the suction force of the piston. When the piston approximately is to the half of the cylinder the valve is closed and the flame or rather the hot gas from the flame on closed in. The hot expanded gas is cooled by the relative colder cylinder and shrinks. Due to the shrinkage of this gas a so-called vacuum is created. This vacuum ensures that the piston is pulled upwardly and a flywheel keeps the cycle in motion. outgoing pressed gas escapes at the upper position of the piston in the cylinder and there is a small explosion hence the specific sound of the vacuum motor popping.For questions or explanations or suggestions mailto: evanden.berg@stirlingheteluchtmotoren.nl

example 1

example 2

example 3