Design optimization of an s-shaped subsonic intake using bayesian approach and bezier curves

Download

index.pdf

Date

2022-5-26

Author

Atasoy, Mete

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

732
views

539
downloads

Engine is a prominent part for the systems of a cruise missile. Reliable and efficient engine performance significantly depends on the quality of the incoming airflow. In this thesis, the aerodynamic performance of a subsonic intake is improved by using open-source multi-task Bayesian optimization (MTBO) tool. The main difference of Bayesian approaches from other optimization methods is that it has information about all design space, along with the uncertainty value. The learning process in the Bayesian approach is developed using the correlation of two different numerical methods. Also, machine learning-based optimization combined with multi-tasking used in this thesis is a pioneering work for air-intake design. The commercial computational fluid dynamics (CFD) solver ANSYS Fluent is used to calculate the flow variables through the intake. The flow quality at a plane interfacing with the engine (denoted as the aerodynamic interfacing plane, AIP) are usually quantified with the flow uniformity and level of pressure loss. MTBO employs a Gaussian process with both high and low cost solutions for machine learning. Then, an acquisition function scores the system output of the surrogate model. In addition, turbulence model selection studies for both cost levels are conducted. An objective function is utilized based on the weighted sum of non-dimensional values of Distortion Coefficient (DC), Pressure Recovery (PR) and weight of the S-duct. Initial sampling approach for multi-tasking approaches is also investigated. Multi-tasking is compared with single-tasking for total execution time when similar optima is achieved. Furthermore, parameters in the objective functions are investigated with Pareto plots.

Subject Keywords

Subsonic Intake Optimization, Aerodynamics, Multi-Task Bayesian Optimization, Bezier Curve, Machine Learning

URI

https://hdl.handle.net/11511/97898

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Parallel optimization of flapping airfoils in a biplane configuration for maximum thrust Tuncer, İsmail Hakkı (2004-05-27) Flapping airfoils in a biplane configuration are optimized for a maximum thrust production. A parallel Navier-Stokes solver on overset grids and a gradient based parallel optimization method are employed. The periodic flapping motion of airfoils in a plane configuration is described in a combined pitch and plunge. The pitch and plunge amplitudes and the phase shift between them are optimized for a range of flapping frequencies. It is shown that at low flapping frequencies, flapping airfoils in a biplane con...
Adjoint-based design optimization of a hypersonic inlet Başaran, Mehmet; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2019) The inlet is one of the most essential parts of a scramjet engine. Its performance heavily affects the overall performance of the engine. The conventional scramjet inlet designs consist of a combination of multiple flat ramps. As the number of ramps increases, the total pressure recovery increases. However, the length and the weight of the engine also increase. In this study, the total pressure recovery of a single-ramp scramjet inlet is improved by aerodynamic shape optimization. In addition, the mass flow...
Aeroservoelastic Modelling and Analysis of a Missile Control Surface with a Nonlinear Electromechanical Actuator Mehmet Ozan, Nalcı; Kayran, Altan (null; 2014-06-16) In this study, aeroservoelastic modeling and analysis of a missile control surface which is operated and controlled by a power limited, nonlinear electromechanical actuator is performed. Linear models of the control fin structure and aerodynamics together with the nonlinear servo-actuation system are built and integrated. The resulting aeroservoelastic system is analyzed both in time and frequency domain. Structural model of the control fin is based on the finite element model of the fin. Aerodynamic model ...
DYNAMIC MODELING AND CONTROL OF AN ELECTROMECHANICAL CONTROL ACTUATION SYSTEM Yerlikaya, Umit; Balkan, Raif Tuna (2017-10-13) Electromechanical actuators are widely used in miscellaneous applications in engineering such as aircrafts, missiles, etc. due to their momentary overdrive capability, long-term storability, and low quiescent power/low maintenance characteristics. This work focuses on electromechanical control actuation systems (CAS) that are composed of a brushless direct current motor, ball screw, and lever mechanism. In this type of CAS, nonlinearity and asymmetry occur due to the lever mechanism itself, saturation limit...
Vortex flow aerodynamics behind a symmetric airfoil at low angles of attack and Reynolds numbers Kurtuluş, Dilek Funda (2021-11-01) The low Reynolds number aerodynamics is important to investigate for micro air vehicle applications. The current paper covers numerical simulations to present the downstream development of the wake patterns and detailed analysis of the vortices generated at the downstream of NACA 0012 airfoil around the critical angle of attack where the instantaneous vortex patterns are oscillatory and differ from the mean vortex pattern for low Reynolds numbers ranging from 1000 to 4000. The instantaneous and mean aerodyn...

Citation Formats

M. Atasoy, “Design optimization of an s-shaped subsonic intake using bayesian approach and bezier curves,” M.S. - Master of Science, Middle East Technical University, 2022.