Adapting an in-cylinder process model to a 2-stroke Bolnes engine and preparations for ammonia-diesel operation

To achieve the emission goals set out by the International Maritime Organization in 2018. Low or zerocarbon fuels will have to be used. Ammonia is considered to be a possible candidate since it doesn’t contain carbon. This thesis will attempt to study two methods that characterize the closed-cylinder process of an internal combustion engine; the...

Turbulence Modeling for Heated Developing Supercritical Flows

In recent years, a considerable amount of research has been directed towards making energy generation more efficient to combat global warming. To aid this goal, the use of supercritical fluids (SCFs) is gaining a lot of traction. SCFs have only one phase and experience a sharp variation of thermophysical properties when heated sufficiently....

Experimental and model based investigation of the volumetric efficiency of a turbocharged natural gas engine

As a big contributor to the the global emissions, the maritime sector strives to bring down its greenhouse gasses and hazardous emissions by enforcing increasing strict rules on the exhaust gasses. This gives major challenges to the maritime sector to develop greener modes of transportation. This report investigates the in-cylinder starting...

Heat Transfer Correction Modelling for RANS Simulations on Rough Surfaces

The Nuclear Research and consultancy Group (NRG) performs CFD simulations to improve the safety of nuclear installations and conducts research leading to new computational methods. One of the problems encountered in nuclear installations is that vital parts of the reactor, such as the fuel rod bundle, corrode over time. Corrosion leads to...

Structure-Preserving Hyper-Reduction Methods for the Incompressible Navier-Stokes Equations

In this master thesis several novel DEIM formulations are proposed that enable the construction of non-linearly stable hyper-reduced order models (hROMs) of the incompressible Navier-Stokes equations. The hROMs have the same mass, momentum and energy conservation properties as the previously proposed ROM, but they do not suffer of prohibitively...

System integration of a high pressure alkaline electrolyser

To anticipate for future demand of sustainable liquid fuels, Zero Emission Fuels B.V. develops a solar powered micro plant which produces methanol from water and carbon dioxide captured from outside air. An intermediate step in this process is the electrolysis of water to create hydrogen which reacts with carbon dioxide to methanol. This study...

Removal of Nitrogen Based Pollutants From the AmmoniaDrive Exhaust

As the shipping industry needs to become greener, it has to move away from fossil fuels. For deep-sea shipping, ammonia is marked as a high potential fuel. The AmmoniaDrive concept feeds the anode-off gas from a Solid Oxide Fuel Cell (SOFC) and additional ammonia into an Internal Combustion Engine (ICE). The exhaust gas coming from the ICE can...

Characterization and Design of a Stripper for a Continuous Direct Air Capture System

Capturing CO2 directly from the air has gained wide attention as it is one of the possible solutions to mitigate the risks of climate change. Zero Emission Fuels (ZEF) is a start-up in Delft that develops a small-scale plant to produce methanol from sunlight and air only. CO2 and H2O are captured from the air by a direct air capture unit that...

Direct Numerical Simulations of Boundary Layer Stability for Non-ideal Fluids

The process in which a smooth laminar flow transits to a chaotic to a chaotic, turbulent state, is a topic of particular interest in the sectors of energy technology and aerodynamics. To study the different paths that can be followed during the transition process, various tools and methods have been developed. A preliminary investigation of the...

The effects of thermal radiation on supersonic flow

Heat transfer via thermal radiation is a common occurrence in industry; be it in flue gas, boilers, reactors, or in supersonic combustor such as in a scramjet propulsion. <br/>Numerous studies have been done regarding the phenomena interacting with thermal radiation in different types of turbulent flows. <br/><br/>For compressible flows the...

Heatpipes for geothermal heat extraction: A study on film heat transfer in heatpipes

Large quantities of heat stored in geothermal aquifers can be of interest to satisfy above-ground heating demands. With the use of heatpipes, placed into the aquifers, heat may be passively extracted. Vertical two-phase thermosiphons are considered in this study. As a result of a local increase in the saturation temperature in liquid pools, heat...

Simulation of Two-Dimensional Steady State Boundary Layers Applied to Nonideal Gas Flows

Organic Rankine Cycle (ORC) Power Plants can be of greatimportance in the energy transition as they are suitable for converting wasteheat to power and can utilize renewable energy for their operation. To improvethe efficiency of ORC Power Plants, the physical phenomena inside thesemachines must be understood....

Flow Analysis of Physical Vapour Deposition Process in OpenFOAM

Tata Steel employs physical vapour deposition (PVD) as a novel galvanization technique in their line production to prevent corrosion. In this process, zinc is evaporated in a vapour distribution box (VDB) and directed via nozzles into a vacuum where it is deposited on a steel substrate. In order to reduce stray deposition, achieve high and...

High Frequency Oscillations in a Combustion Chamber: A Novel Mitigation Strategy

Restrictions on NOx emissions are increasingly stricter. In order to reduce the emissions of a gas turbine, manufacturers moved from diffusion-flames to lean premixed flames in their combustion process. However lean premixed flames are prone to (transverse) combustion instabilities. These instabilities consists of thermoacoustically driven...

Investigation of dense gas effects on transition to turbulence over a flat plate boundary layer

Laminar-turbulent transition (LTT) is the process through which smooth laminar flow transits into chaotic turbulent flow. Investigation of the paths taken to transit into turbulence is a front-runner among other methods followed to characterise turbulent flows. This is of particular importance in aerospace and energy industries for the design of...

Design optimisation and commissioning of the Delft rotating heat pipe setup

The heat pipe assisted annealing project is a project in which Tata Steel, TU Delft and Drever International work together to develop a continuous annealing line with heat pipes. In an annealing line cold rolled steel is heated to 973 K and cooled down again to change the properties of the steel. In the heat pipe assisted annealing project the...

Parametric Emission Prediction Model in Gas Turbines with Exhaust Gas Recirculation

One of the challenges in gas turbines is in the reduction of NOx and CO emissions due to simultaneous<br/>dependence on stringent emission norms and subsequent demand for change in operating conditions. To cater the volatile demand of power supply, most of the gas turbines have to be flexible to changing loads. Closer the load is to full load,...

RANS-FGM simulation of n-heptane spray flame in OpenFOAM: A new implementation of flamelet generated manifold to account for enthalpy loss with detailed reaction mechanisms

The efficient and clean combustion of liquid fuels is a fundamental requirement in the design of future energy systems. Simulation plays a more and more important role in the design of such burners. In this work the spray combustion simulation approach introduced by Ma (2016) is improved, and validated against the CORIA Jet Spray Flame database ...