Loading...

Numerical investigation of back pressure and free-stream effects on a mixed compression inlet performance

Ebrahimi, A ; Sharif University of Technology | 2018

498 Viewed
  1. Type of Document: Article
  2. DOI: 10.24200/sci.2017.4324
  3. Publisher: Sharif University of Technology , 2018
  4. Abstract:
  5. Inlet performance has an important role in the operation of air-breathing propulsion systems. In this study, performance of a supersonic axisymmetric mixedcompression inlet in the supercritical operating condition is numerically studied. The effects of free-stream Mach number and engine-face pressure on performance parameters, including mass flow ratio, drag coefficient, total pressure recovery, and flow distortion, are investigated. For this sake, a multi-block density-based finite volume CFD code is developed, and Reynolds-averaged Navier-Stokes equations with Spalart-Allmaras oneequation turbulence model are employed. The code is validated by comparing numerical results against other computational results and experimental data for two test cases of inviscid flow in a two-dimensional mixed-compression inlet and flow in an external compression inlet. Finally, the code is utilized for the investigation of a specific supersonic mixed-compression inlet with the design Mach number of 2.0 and length-to-diameter ratio of 3.4. Results revealed that the increment of free-stream Mach number leads to the decrease in total pressure recovery and drag coefficient, while mass flow ratio and flow distortion increase. The effects of engine-face pressure on performance parameters showed that by increasing the engine-face pressure, mass flow ratio and drag coefficient remain constant, while total pressure recovery increases and flow distortion decreases. © 2018 Sharif University of Technology. All rights reserved
  6. Keywords:
  7. Mixed compression inlet ; Roe's approximated Riemann solver ; Aerodynamics ; Codes (symbols) ; Computational fluid dynamics ; Drag ; Drag coefficient ; Engines ; Mach number ; Mass transfer ; Propulsion ; Recovery ; Turbulence models ; Viscous flow ; Mixed compressions ; Multi-block grid ; Performance parameters ; Riemann solver ; Spalart-Allmaras turbulence model ; Navier Stokes equations
  8. Source: Scientia Iranica ; Volume 25, Issue 2B , 2018 , Pages 751-761 ; 10263098 (ISSN)
  9. URL: http://scientiairanica.sharif.edu/article_4324.html