Mechanics of fused filament fabricated thermoplastics: Modelling the mesostructure

In this thesis, the relation between the manufacturing parameters and the mechanical properties of Fused Filament Fabrication (FFF) materials is analyzed to gain a better understanding of interaction between these two. The existing literature was first analyzed to get an understanding for the process, resulting in a proposed mesostructural and...

Gust tailoring in a wind tunnel for bird and MAV flight experiments

Structure Preserving Isogeometric Analysis for Computational Fluid Dynamics

Double degree. Supervision of the thesis also at: Faculty Applied Mathematics, Department Numerical Analysis, Programme M.Sc. Applied Mathematics. Structure-preserving discretization techniques preserve fundamental structure of operators and operands found in partial differential equations. Classical discretization techniques sometimes neglect...

On the Turbulent Mixing in Horizontal Axis Wind Turbine Wakes

The wake flow of a horizontal axis wind turbine is characterised by lower wind speed and higher turbulence than the free-stream conditions. When clustered in large wind farms, wind turbines regularly operate inside the wake of one or more upstream machines. This is a major cause of energy production loss and a source of higher fatigue loads on...

Aerodynamics of flapping-wing Micro-Air-Vehicle: An integrated experimental and numerical study

The interest in Micro Air Vehicles (MAVs) has stimulated continuous research activities, in view of their potential in civilian and military applications. An autonomous MAV with dedicated onboard sensors would be capable of executing mission in closed environments, such as surveillance, in door inspection in support of rescue operations and...

Accelerating aircraft design using automated process generation: An experimental architecture for aircraft design software

The aircraft industry has seen many evolutionary changes in the past decades. Since the Boeing 707 however, the general shape and configuration of transport aircraft have remained similar and so has the aircraft design process. Since the aviation community is about to face a revolutionary breakthrough featuring new aircraft concepts like blended...

Design of a modular fuselage for commercial aircraft: To cope with seasonal variation in passenger demand

The subject of this research is a new concept of modular aircraft designed to cope with the seasonal variation in passenger demand by opening the fuselage and increasing its length with extra bits of fuselages. The goal is to find out if this new aircraft concept is more profitable than the current alternatives. Previous work have looked at...

Generic Analysis Methods for Gas Turbine Engine Performance: The development of the gas turbine simulation program GSP

Numerical modelling and simulation have played a critical role in the research and development towards today’s powerful and efficient gas turbine engines for both aviation and power generation. The simultaneous progress in modelling methods, numerical methods, software development tools and methods, and computer platform technology has provided...

New concepts for organic Rankine cycle power systems

Energy provision is one of the major challenges for the Human Society, and it is increasingly clear that the current production/consumption model is not sustainable. The envisaged energy system is smarter, more decentralised and integrated. Energy conversion systems based on the organic Rankine thermodynamic cycle (ORC) have the potential to...

Uncertainty quantification in particle image velocimetry and advances in time-resolved image and data analysis

Particle Image Velocimetry (PIV) is a well-established technique for the measurement of the flow velocity in a two or three-dimensional domain. As in any other technique, PIV data is affected by measurement errors, defined as the difference between the measured velocity and its actual value, which is unknown. Aim of uncertainty quantification is...

Engine Health Monitoring Demonstrator based on GPA: A Gas Path Analysis GPA concept developed using the Gas turbine Simulation Program (GSP)

This report describes the work conducted by TUD for WP 4.2.7 of the ESPOSA project for the development of Gas Path Analysis (GPA) based Engine Health Monitoring (EHM) concepts for the BE1 and BE2 engine designs. Models developed with the Gas turbine Simulation Program GSP have been used for the development and for the simulation of deteriorated...

Engine simulation models for the cycles of BE1 and report on obtained performance data: Model development with the Gas turbine Simulation Program (GSP)

report describes the work conducted by TUD for WP 1.3.3 of the ESPOSA project for the development of the BE1 engine simulation model in NLR’s Gas turbine Simulation Program, GSP. Results include simulation results, validation and the GSP model project files. The model is based on simulated data from PBS Velká Bíteš, Czech Republic, (PBS). The...

CFD Analysis of Fuel Atomization, Secondary Droplet Breakup and Spray Dispersion in the Premix Duct of a LPP Combustor

The two phase flow in the premix duct of a LPP combustor is computed using a Lagrangian droplet tracking method. To reproduce the characteristic spray structure of an air-assisted pressure-swirl atomizer, a sheet spray model is de-rived from measured sheet parameters and combined with an advanced concept for modeling secondary atomization...

Efficient Numerical Calculation of Evaporating Sprays in Combustion Chamber Flows

Representing two different conceptual approaches, either Eulerian continuum models or Lagrangian particle models are commonly applied for the numerical description of dispersed two phase flows. Taking advantage of the positive features inherent to each model, a combination approach is presented in this study for the efficient computation of...