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Studying the Effects of Different Turbulence Models Aimed to Estimate and Simulate the Phenomenon of Buzz in a Supersonic Air Intake

Mokhtari, Ali | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49863 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Soltani, Mohammad Reza; Farahani, Mohammad
  7. Abstract:
  8. This study aimed to estimate and simulate the phenomenon of buzz in a supersonic air intake and examine the effects of turbulence models on the accuracy and quality of modeling this phenomenon was divided into two parts. In the first part, turbulence models and characteristics of each of them in modeling supersonic flow was studied as well as available researches were investigated to achieve appropriate numerical method for numerical analysis of intakes using turbulence models. In the second part, one axial symmetry intake of the compound density type was taken which designed for Mach number of 2.0 in order to achieve accurate numerical methods and validate it to model intakes flow. With better understanding the impact of turbulence models in supersonic flow modeling as well as validation numerical methods, the aim of modeling along the first part was applying turbulence model (in this intake or similar intakes) in the future with more and accurate understanding. This intake was selected due to the valid and more experimental data under various operating conditions as well as geometry simplicity and flow complexity which are saving specifically the cost and time required to get various results and applying it to the other intakes and will accelerate the work processes in the future research. Wind tunnel tests related to this intake previously performed and the corresponding experimental data had been analyzed. The mentioned intake was modeling and networking in two-dimensional axially symmetric and then, domain and final computing network were selected after examining the solution independence from domain and computing network. Numerical simulation was conducted in two stages. In the first stage, the performance of turbulence models in the reliable numerical solution to EBR ratio of 55%, 60%, 62/5% and 65% were examined; then, considering the increasing effects of EBR ratio and selection appropriate turbulence models, numerical simulation for EBR ratio of 75% and modeling buzz phenomenon were carried out. Numerical analysis results indicated excellent agreement with experimental data
  9. Keywords:
  10. Air Intakes ; Mixed Compression Supersonic Intake ; Supersonic Intake ; Buzz Phenomenon ; Turbulence Model

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