The superior output power-to-weight ratio of the gas turbine engine has made it the mainstay of modern aviation propulsion for both civilian and military applications. The capability of producing high output power at low engine weight has also made it a common propulsion system in both marine and armored military ground applications. In addition, gas turbine engines are used for power generation as either stand-alone systems or coupled with steam turbines to power electrical generators and also to power rotating machinery such as oil pumps in large pipeline systems. Gas Turbine Engine Steady Performance The surge and choke lines bound the operating range of a gas turbine engine on the compressor aerodynamic performance map, Figure 1. To assure compressor stability during engine operation, an engine is designed with a surge margin. This entails assuring that the operating point remains a specified distance from the surge line on the performance map. Large surge margins are employed due to transient conditions that move the compressor operating point closer to the surge line. However, a large surge margin that places the compressor operating line far from the surge line can preclude operation at the peak pressure rise or maximum efficiency region. Also, the increase in operational range results in additional flexibility for matching the compressor with the other gas turbine engine components.
The structural properties of both rotating or stationary airfoil rows are predicted first with finite element models. To determine the unsteady aerodynamic loading on the airfoil rows, a definition of the unsteady aerodynamic forcing function in terms of its harmonics is required. The forcing function is then Fourier decomposed into harmonics. The unsteady aerodynamic response of the airfoil row to each forcing function harmonic is then assumed to be comprised of two components: the disturbance being swept past the nonresponding airfoils, termed the gust unsteady aerodynamics; the airfoil vibratory response to this disturbance, the motion-induced unsteady aerodynamics or the aerodynamic damping.
Tags : gas turbine engine, finite element models, turbine engine components, gas turbine engine compressor, gas turbine engines, aviation propulsion, steam turbines, power to weight ratio, aerodynamic loading, electrical generators, propulsion system, simulation design, oil pumps, pipeline systems, ground applications
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