常见发动机原理（Common engine principle）.docVIP

常见发动机原理（Common engine principle） Piston engine The aviation piston engine is a mixture of gasoline and air, burning in closed containers (cylinders), and expanding the use of power machinery. A propeller generated by a propeller driven by a piston engine. Therefore, as the power plants aircraft, the engine and propeller can not be split. Mainly by cylinder block, piston, connecting rod, crankshaft, valve, propeller, reducer, gear box, etc.. The cylinder is the place where the mixture of gasoline and air burns. The cylinder accommodates the reciprocating motion of the piston. The cylinder head is equipped with an electric spark plug that ignites the gas mixture (usually referred to as the contact tip) and the intake and exhaust valves. When the engine runs, the cylinder temperature is high, so there are many radiating fins on the outer wall of the cylinder for expanding the heat dissipation area. The cylinder is arranged in the engine housing (shell), mainly in a star or V form. The range of common star engines, 5, 7, 9, 14, 18 or 24 cylinders. The more the number of engines in the cylinder, the same volume, the greater the power of the single cylinder. The gas pressure in the cylinder that shows the piston as a reciprocating motion, and this motion is converted to the rotational motion of the crankshaft through a connecting rod. The link will be used to connect the piston and crankshaft. The crankshaft is a member of the engines output power. When the crankshaft rotates, the propeller is driven by a reducer to rotate and produce tension. In addition, the crankshaft has also led to some accessories (such as pumps, generators, etc.). Is used to control the intake valve, exhaust valve timing, to open and close the valve mechanism. Two, vortex jet Prior to World War II, all aircraft powered by piston engines, the engine did not produce propulsion, but needed to drive propellers, propellers rotating in the air to propel the aircraft forward. The piston engine + propeller