Feedback

Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
VIEW 40 | DOWNLOAD 206

Final work : Numerical investigation of the ground vortex ingestion into the intake under crosswind

Download
Chennuru, Venkata Yashwanth Teja ULiège
Promotor(s) : Dimitriadis, Grigorios ULiège
Date of defense : 5-Sep-2022/6-Sep-2022 • Permalink : http://hdl.handle.net/2268.2/15929
Details
Title : Final work : Numerical investigation of the ground vortex ingestion into the intake under crosswind
Author : Chennuru, Venkata Yashwanth Teja ULiège
Date of defense  : 5-Sep-2022/6-Sep-2022
Advisor(s) : Dimitriadis, Grigorios ULiège
Committee's member(s) : Hillewaert, Koen ULiège
Vahdati, Mehdi 
Language : English
Number of pages : 89
Keywords : [en] Ground vortex ingestion
[en] Unsteady distortion
[en] Crosswind conditions
[en] Numerical setup
Discipline(s) : Engineering, computing & technology > Aerospace & aeronautics engineering
Research unit : Imperial College London
Name of the research project : Numerical investigation of the ground vortex ingestion into the intake under crosswind
Target public : Researchers
Professionals of domain
Student
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil en aérospatiale, à finalité spécialisée en "turbomachinery aeromechanics (THRUST)"
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] Aiming to increase aircraft fuel efficiency, Ultra High By-pass ratio (UHBR) engines are gaining
popularity. When operated under static or near static conditions, subject to crosswind, UBHR
engines can experience a lip separation on the windward side of the intake, and the formation
of a ground vortex extending from the stagnation point on the ground into the intake called a
ground vortex. These vortices create considerable stagnation pressure losses and flow distortion
at the engine fan face affecting the efficiency of the engine and structural integrity of the fan.
Furthermore, the ground vortices can generate forces that can suck debris from the ground
into the intake, mainly over poorly maintained runways. This Foreign Object Digestion (FOD)
can lead to compressor blades’ erosion, reducing the engine’s service life. Considering the
advantages of numerical analysis over full and scaled model experiments, the ground vortex
ingestion is studied numerically. The present work aims to provide the best numerical setup to
analyse this phenomenon using the experimental data for validation.
Initially, a few studies are conducted to determine the appropriate turbulence model and the
significance of the boundary layer profile for simulations. A grid sensitivity study is performed
using steady-state RANS, and the vortex is learned to be stable in low crosswind conditions.
URANS is solved for medium and high crosswind conditions to fully understand the vortex’s
unsteadiness using coarse mesh. The temporal convergence study determines the time stepping
for the unsteady simulation. This research demonstrated periodic vortex motion in medium and
high crosswind conditions at ≈10 Hz and ≈22 Hz, respectively. Furthermore, the separation
exists in high crosswind conditions, and the shear layer oscillates at a broadband frequency
rather than a single or narrow band. Good agreement is found between the time-averaged
URANS results and the experiment data using coarse mesh. The proposed numerical setup can
therefore be used for further analysis of ground vortex ingestion studies.


File(s)

Document(s)

File
Access Thesis_Venkata.pdf
Description:
Size: 6.84 MB
Format: Adobe PDF

Annexe(s)

File
Access Summary.pdf
Description:
Size: 567.24 kB
Format: Adobe PDF

Author

  • Chennuru, Venkata Yashwanth Teja ULiège Université de Liège > Master ingé. civ. aérospat., à fin. (THRUST)

Promotor(s)

Committee's member(s)

  • Hillewaert, Koen ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Design of Turbomachines
    ORBi View his publications on ORBi
  • Vahdati, Mehdi
  • Total number of views 40
  • Total number of downloads 206










All documents available on MatheO are protected by copyright and subject to the usual rules for fair use.
The University of Liège does not guarantee the scientific quality of these students' works or the accuracy of all the information they contain.