User:Mkoronowski/turbomachinery
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Turbomachinery, in mechanical engineering, describes machines that transfer energy between a rotor and a fluid, including both turbines and compressors. While a turbine transfers energy from a fluid to a rotor, a compressor transfers energy from a rotor to a fluid. The two types of machines are governed by the same basic relationships including Newton's second Law of Motion and Euler's energy equation for compressible fluids. This is illustrated by the horizontal axis of of both Figure_0.2 and 0.3. Centrifugal pumps are also turbomachines that transfer energy from a rotor to a fluid, usually a liquid, while turbines and compressors usually work with a gas.[1]
In actuality, there are two overall kinds of turbomachines are encountered in practice. Those that are open and those that are closed turbomachines. Open machines such as propellers, windmills, and unshrouded fans act as isolated airfoils within an infinite (boundary condition) extent of fluid. Conversely, closed machines operate more similarly as an infinite number of airfoils within a finite (boundary condition) quantity of fluid as it passes through a housing or casing (control volume).
As a result open turbo-machines have historically been designed and analyzed using wing theory. However, recent advances in CFD has shrunk the gap in applied mathematics such that unducted fans, as used on prototype aircraft engines, are closely related to their closed counterparts.