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Study of Injection Process from Bi-Swirl Injector in Supercritical Condition

Dorosti, Ehsan | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50742 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Farshchi, Mohammad; Mardani, Amir
  7. Abstract:
  8. Presently, a wide range of devices operate at supercritical condition. In fact, supercritical condition refers to a condition in which both temperature and pressure of injected fluid exceed the critical point. In the case of modern internal combustion engine, the temperature and pressure of combustion chamber is high enough that can be considered as supercritical condition, whilst the fuel injected may be subcritical or transcritical.It has been widely accepted that in supercritical state, vaporization enthalpy is vanished and there is no distinction between gas and liquid. Hence, only a single state will remain which is neither liquid nor gas and referred to as fluid. Moreover, many experimental studies have been conducted under supercritical condition [4, 15] which depicts that as pressure rises to supercritical state, surface tension of the fluid will be gradually plummeted. This decrement continues to a point that the surface tension is completely expunged.In the present work, it is intended to investigate the effects of transport properties on supercritical mixing and flow characteristics of propellant and oxidizer in mono-propellant and bi-propellant shear injector as well as mono-propellant and bi-propellant swirl injector numerically. The transport properties in supercritical condition are defined according to Chung et al. method and Takahashi method is intended for definition of binary diffusion. The software used in these simulations is Fluent in which the transport properties are defined in UDF module
  9. Keywords:
  10. Swirl Injector ; Supercritical Condition ; Transport Properties ; Monopropellant ; Supercritical Injection Tester

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