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the action and which is the reaction, both forces are a part of a single interaction and neither force exists without the other. We learned this principle earlier with the rocket. JET ENGINE TYPES AND DESIGNATION We learned the four basic types or classes of jet engines: rocket, pulsejet, ramjet and gas turbine. As an AD, you will work with the gas turbine engines. Under gas turbine engines are four types: turbojet, turboprop, turbofan, and turboshaft. Turbojet Turbojet engines are the basis for all other gas turbine engines. We already know their cycle. Air is drawn into the turbojet engine, compressed, mixed with fuel, and burned continuously. The exhaust product of this burning operates the turbine for the compressor, producing thrust which propels the aircraft, such as F-5, T-38, and the Concord passenger aircraft use a Turbojet engine. Adding fans, propellers, or free turbines changes the basic turbojet into a turboshaft, turboprop, or turbofan. Turboshaft Figure 1-12 — typical turboshaft engine. Turboshaft engines use the free turbine principle. The gas generator turbine drives the compressor to sustain engine performance. The power turbine drives the helicopter rotors through driveshaft’s and gearboxes. The gas generator is located immediately aft of the combustion section and the power turbine is just aft of the gas generator turbine. Exhaust gases drive the gas generator turbine and a power turbine. Figure 1-12 shows a cutaway view of a turboshaft engine. Turboprops Turboprops have a reduction gear assembly, torquemeter assembly, compressor section, combustion section (or chambers), turbine, and exhaust section, most of which operate in the same manner as their counterparts in the turbojet. The difference is in the turbine. It sends increased power, generated by the exhaust gases passing through additional stages of the turbine, to the torquemeter assembly and then to the reduction gear assembly (Figure 1-13). A propeller mounted on the reduction gear assembly provides thrust for the plane. Figure 1-13 — Turboprop engine. 1-7PDF Image | JET ENGINE THEORY AND DESIGN
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