Download Aerothermodynamics of Gas Turbine and Rocket Propulsion by G. Oates PDF

By G. Oates

This publication on gasoline turbine know-how has been a best-seller because it was once first released. It now contains a accomplished set of software program courses that supplement the textual content with difficulties and layout analyses. software program subject matters incorporated are surroundings courses, quasi-one-dimensional move courses (ideal constant-area warmth interplay, adiabatic constant-area circulate with friction, rocket nozzle functionality, common surprise waves, indirect surprise waves), fuel turbine courses (engine cycle research and engine off-design performance), and rocket combustion courses (Tc and computer given, Hc and workstation given, isentropic expansion).
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Additional info for Aerothermodynamics of Gas Turbine and Rocket Propulsion

Example text

It is apparent that an assumption of reversibility must have been made implicitly. A little thought indicates that by assuming the enthalpy at the exit was that of the entire container, or more particularly by assuming the pressure at the exit was that of the entire chamber, in fact no "viscous drop" was assumed for the pressure and hence that the process within the chamber was reversible. If the expulsion of the fluid had been particularly rapid or the fluid particularly viscous, a pressure drop across the chamber would be expected and hence assuming the pressure at the exit and in the chamber to be identical would be in error.

This observation can be extended to indicate that the flow in individual stream tubes of a general three-dimensional flow can be expected to be described by the quasi-one-dimensional flow equations, although the determination of the behavior of the stream tube itself (through the pressure fields induced by other stream tubes) will rely upon solution of the complete equations. In what follows the first law of thermodynamics is extended to include the effects of the kinetic energy and the potential energy of the flowing fluid in a form suitable to adapt for use in the quasi-one-dimensional equations.

Thus, a very rough nozzle might cause the process to be highly irreversible, with the result that even if the pressure drops the same amount as it does in another smoother nozzle, the velocity at that point in the nozzle would be less than that in the smooth nozzle. The sum of the kinetic energy and enthalpy would be the same, however, indicating that the roughness has had the effect of slowing down the fluid and returning the directed velocity to the random thermal velocities identified with the temperature (and enthalpy).

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