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Detail Design of a Supercritical Injection Tester, Based on Numerical Simulation of the Spray Structures under Supercritical Conditions

Pourmahmoud, Ataollah | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48304 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Farshchi, Mohammad
  7. Abstract:
  8. Based on the results of a cryogenic swirl flow numerical simulation under supercritical conditions, a global injection tester has been designed. For numerical simulation of the injection process by using ANSYS FLUENT as the CFD solver, the full 3D flowfield has been meshed by a fully structure manner. k-ω(SST) has been used as the turbulence model which has been captured many of the swirl cryogenic flow structures in the both steady and unsteady conditions. Also, the modified Soave-Redlich-Kwong EOS has been accommodated in a broad range of supercritical pressures for estimating state functions, thermodynamic properties and transport properties. The results show that increasing ambient pressure leads to increasing wavelength and instability frequency of the wavy structures on the spray boundary and decreasing the propagation velocity of the structures under supercritical conditions; whereas the spray cone angle and wave amplitude almost have not any dependency to the ambient pressure. Despite of the prime importance of the numerical simulations, like present study, they cannot be used for supporting the design process of any real injector and the need of developing a supercritical injection laboratory is undeniable. So, the second part of present work, has been devoted to developing a global injection tester under both sub and supercritical conditions, based on the obtained qualitative and quantitative physical insight from previous part and also based on the published relevant documents. Finally, for more sure consistency and reliability of all the subsystems, the proposed detailed design has been simulated by using FLOWMASTER as a 1D CFD analizer
  9. Keywords:
  10. Swirl Injector ; Supercritical Condition ; Mixing Process ; Injection ; Cryogenic Propellant ; Supercritical Injection Tester

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