How Can Fly Helicopters?

Sunday, August 14, 2011
Jet engines

Jet engines (Gas-Turbine) used for producing power and not just to drive the rotor or turbine. If you've heard the term turbo engine, this machine is the basis of jet engines. This machine takes power from the combustion and release of mechanical energy that can rotate the rotor or turbine. Turbine blades shaped to place the conversion of thermal expansion of burning fuel into thrust power, and take little energy to drive the turbines of the power thrust that is used to compress the air in front of the machine.

Helicopters (almost every case these machines are used) using jet engines to generate power that will move the rotor. Engine helicopters like the UH-1 Huey, the Bell Jet Ranger, and AH-64 Apache is a derivative of the engine gas turbine engines. Some small or old helicopter using reciprocating engines (Piston) as a source of energy, but the modern helicopter gas turbine engine wear. These machines are used because they are lightweight, powerful, and works well. These machines are not as reciprocating engines are too many moving parts, so the probability of engine damage is smaller.

Let's see how jet engines work. Jet engines work based on four principles: "Go, Press, Fuel and Explosion". The figure below illustrates a cross section of gas turbine engines.


The front of the engine is the compressor is the air intake and "Press" so it makes more congestion and better air for combustion. Air into the compressor through the compressor blades shaped like a miniature airplane wings. This compressor works like a large fan that sucks air into the engine. Between rows of compressor blades, stationary blades are commonly called "stator". Stator is useful to change the direction of air flow and helps the process of compression. As shown in the figure, the area that can be met on a smaller air compressor closer to the fuel mixing section (diffuser). The air then flows into the diffuser, then into the combustion section. In that section the air will be mixed with fuel and ignited to trigger chemical reactions that can generate power. The explosion combustion air and fuel mixture produces a thermal expansion that passed through the turbine so that the thrust producing power that can move turbines. This engine produces enough thrust to drive the compressor, so that the generated power is continuous. But in the real design will have a much more complicated than this example, and this theory is used to represent the working process of a jet engine.


How is energy obtained from the engine transmitted to the rotor?

Power is transmitted from the engine using a gearbox that converts power from the engine and sent to the transmission. In the transmission of engine speed (RPM) is reduced from thousands of rounds per second to hundreds of revolutions per second. With this reduction increases the torque and rotation dipelankan in order to achieve the desired rotation to the rotor system. Controlling transmission power which is channeled to the rotor.

Gearbox gear arranged on the machine a little less power to drive components such as oil pumps, generators and fuel control of the machine itself.

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