Roland Schmehl

Roland Schmehl
Delft University of Technology | TU · Faculty of Aerospace Engineering (AE)

Dr.

About

272
Publications
129,582
Reads
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2,257
Citations
Introduction
Roland Schmehl graduated in 1994 from Karlsruhe University, Germany, in Mechanical Engineering. Following his PhD research on computational modelling of multiphase flows and liquid droplet dynamics he worked for the European Space Agency and TNO Automotive Safety Solutions before starting as Associate Professor at the Faculty of Aerospace Engineering of Delft University of Technology. His research focus is Airborne Wind Energy and he coordinated two major EU Horizon 2020 projects on the subject.
Additional affiliations
October 2009 - present
Delft University of Technology
Position
  • Professor (Associate)
Description
  • Responsible for Airborne Wind Energy
October 2009 - present
Delft University of Technology
Position
  • Instructor
Description
  • Teaching MSc-level course on Airborne Wind Energy (3 ECTS) and supervise the Design Synthesis Exercise (BSc final project).
April 2005 - July 2009
TNO Automotive Safety Solutions (TASS)
Position
  • Software Architect
Description
  • Development of an airbag deployment solver based on the Cartesian Cut-Cell Method. Development of thermodynamic models for airbag inflators, with a focus on cold gas technology.
Education
January 1995 - October 2003
Karlsruhe Institute of Technology
Field of study
  • Two-phase flow
October 1987 - October 1994
Karlsruhe Institute of Technology
Field of study
  • Mechanical Engineering

Publications

Publications (272)
Article
Full-text available
A detailed computational analysis of the oxidizer preflow during startup of a storable propellant upper-stage rocket engine is presented. This low-pressure flow regime is controlled by various two-phase phenomena, particularly flash atomization and flash evaporation of superheated liquid oxidizer, leading to a significant temperature drop in the co...
Book
Full-text available
This book provides in-depth coverage of the latest research and development activities concerning innovative wind energy technologies intended to replace fossil fuels on an economical basis. A characteristic feature of the various conversion concepts discussed is the use of tethered flying devices to substantially reduce the material consumption pe...
Article
Full-text available
The traction force of a kite can be used to drive a cyclic motion for extracting wind energy from the atmosphere. This paper presents a novel quasi-steady modelling framework for predicting the power generated over a full pumping cycle. The cycle is divided into traction, retraction and transition phases, each described by an individual set of anal...
Book
Full-text available
This reference offers an overview of the field of airborne wind energy. As the first book of its kind, it provides a consistent compilation of the fundamental theories, a compendium of current research and development activities as well as economic and regulatory aspects. In five parts, the book demonstrates the relevance of Airborne Wind Energy an...
Article
Full-text available
Currently developed airborne wind energy systems have reached sizes of up to several hundred kilowatts. This paper presents the high-level design and a six-degrees-of-freedom model of a future fixed-wing airborne wind energy system operated in pumping cycles. This framework is intended to be used as an open-source reference system. The fixed-wing a...
Article
Full-text available
In pumping airborne wind energy (AWE) systems, the kite is operated in repetitive crosswind patterns, pulling the tether from a winch that drives a generator on the ground. During the reel-out phase of its operation, it produces power, whereas, during the reel-in phase, it consumes a small fraction of the produced power. This leads to an oscillatin...
Article
Full-text available
Leading-edge inflatable (LEI) kites use a pressurized tubular frame to structurally support a single skin membrane canopy. The presence of the tubes on the pressure side of the wing leads to characteristic flow phenomena for this type of kite. In this paper, we present steady-state Reynolds-Averaged Navier-Stokes (RANS) simulations for a LEI wing f...
Article
Full-text available
Airborne wind energy (AWE) systems use tethered flying devices to harvest higher-altitude winds to produce electricity. For the success of the technology, it is crucial to understand how people perceive and respond to it. If concerns about the technology are not taken seriously, it could delay or prevent implementation, resulting in increased costs...
Cover Page
Full-text available
The image shows a leading-edge inflatable (LEI) kite wing typically used for airborne wind energy applications. It is composed of a pressurized tubular frame to structurally support a single skin membrane canopy. Here, we present the results of Reynolds-Averaged Navier–Stokes (RANS) simulations for flow past the wing. The image shows a contour plot...
Preprint
Steady-state Reynolds-Averaged Navier-Stokes (RANS) simulations are performed for a leading-edge inflatable wing for airborne wind energy applications. Expanding on previous work where only the inflatable leading edge tube was considered, eight additional inflatable strut tubes that support the wing canopy are now included. The shape of the wing is...
Preprint
Full-text available
Airborne wind energy (AWE) systems use tethered flying devices to harvest higher-altitude winds to produce electricity. For a successful deployment of these systems, it is crucial to understand how the public perceives them. If public concerns about the technology are not taken seriously, implementation could be delayed or, in some cases, prevented...
Article
Full-text available
Generating renewable energy on Mars is technologically challenging. Firstly, because, compared to Earth, key energy resources such as solar and wind are weak as a result of very low atmospheric pressure and low solar irradiation. Secondly, because of the harsh environmental conditions, the required high degree of automation, and the exceptional eff...
Article
Full-text available
The aerodynamic characteristics of a leading edge inatable (LEI) kite and a rigid-framed delta (RFD) kite were investigated. Flight data were recorded by using an experimental setup that includes an inertial measurement unit, a GPS, a magnetometer, and a multi-hole Pitot tube onboard the kites, load cells at every tether, and a wind station that me...
Conference Paper
Full-text available
Computational simulation of the aerodynamics of a ram-air kite for airborne wind energy applications
Presentation
Full-text available
Computational simulation of the aerodynamics of a ram-air kite for airborne wind energy applications
Conference Paper
Full-text available
Flight dynamic and aerodynamic characterization of a softkite with suspended robotic control unit
Conference Paper
Full-text available
TU Delft kite power flight data 2010 to 2015
Presentation
Full-text available
Flight dynamic and aerodynamic characterization of a softkite with suspended robotic control unit
Presentation
Full-text available
TU Delft kite power flight data 2010 to 2015
Article
Full-text available
Airborne wind energy systems convert wind energy into electricity using tethered flying devices, typically flexible kites or aircraft. Replacing the tower and foundation of conventional wind turbines can substantially reduce the material use and, consequently, the cost of energy, while providing access to wind at higher altitudes. Because the fligh...
Preprint
Full-text available
Generating renewable energy on Mars is technologically challenging. Firstly, because compared to Earth, key energy resources such as solar and wind are weak as a result of very low atmospheric pressure and low solar irradiation. Secondly, because of the harsh environmental conditions, the required high degree of automation and the exceptional effor...
Poster
Full-text available
Airborne wind energy (AWE) systems convert wind energy into electrical energy using autonomous tethered flying devices. Deemed a potentially game-changing solution to clean and sustainable energy generation, AWE is increasingly attracting the attention of governments, policymakers and industry worldwide. AWE technology can significantly reduce the...
Article
Full-text available
Airborne wind energy (AWE) systems are tethered flying devices that harvest wind resources at higher altitudes, which are not accessible to conventional wind turbines. To become a viable alternative to other renewable energy technologies, AWE systems are required to fly reliably and autonomously for long periods of time while being exposed to atmos...
Poster
Full-text available
Airborne wind energy (AWE) systems use tethered flying devices to harvest wind energy beyond the height range accessible to tower-based turbines. AWE systems can produce the electric energy with a lower cost by operating in high altitudes where the wind regime is more stable and stronger. For the commercialisation of AWE, system reliability and saf...
Poster
Full-text available
Airborne wind energy (AWE) is the conversion of wind energy into electricity using tethered flying devices. Replacing towered wind turbines by lightweight tensile structure not only reduces the material effort and thus cost of energy, but also provides access to an energy potential that has not been used so far, wind at higher altitudes. In this wo...
Poster
Full-text available
The design and computational model of a representative multi-megawatt airborne wind energy (AWE) system operated in pumping cycles is presented [1], together with a simulation framework that accounts for the flight dynamics of the fixed wing aircraft and the sagging of the tether, combining this with flight control and optimisation strategies to de...
Poster
Full-text available
In this paper we present a computational approach to simulate the steady-state aeroelastic deformation of a ram-air kite for airborne wind energy applications. The approach is based on a computational fluid dynamics (CFD) solver that is two-way coupled with a finite element (FE) solver. All components of the framework, including the meshing tools a...
Poster
Full-text available
Airborne wind energy (AWE) aims to harness wind energy at increasing altitudes by flying a device that is tethered to the ground. One of the existing concepts consists in using a leading edge inflatable (LEI) wing composed of a circular leading edge that is connected to a very thin canopy and supported by inflated struts
Article
Full-text available
In this work we explore the initial design space for composite kites, focusing on the configuration of the bridle line system and its effect on the aeroelastic behaviour of the wing. The computational model utilises a 2D cross sectional model in conjunction with a 1D beam model (2+1D structural model) that captures the complex composite coupling ef...
Article
Full-text available
In this paper, we present the design and computational model of a representative multi-megawatt airborne wind energy (AWE) system, together with a simulation framework that accounts for the flight dynamics of the fixed-wing aircraft and the sagging of the tether, combining this with flight control and optimisation strategies to derive the power cur...
Article
Full-text available
Airborne wind energy (AWE) systems use tethered flying devices to harvest wind energy beyond the height range accessible to tower-based turbines. AWE systems can produce the electric energy with a lower cost by operating in high altitudes where the wind regime is more stable and stronger. For the commercialization of AWE, system reliability and saf...
Article
Full-text available
In this paper we present a computational approach to simulate the steady-state aeroelastic deformation of a ram-air kite for airborne wind energy applications. The approach is based on a computational fluid dynamics (CFD) solver that is two-way coupled with a finite element (FE) solver. All components of the framework, including the meshing tools a...
Article
Full-text available
The quasi-steady performance model (QSM) has been developed specifically for pumping airborne wind energy systems using flexible membrane wings. In this study, we validate this model using a comprehensive set of flight data that includes 87 consecutive pumping cycles and is acquired with the development platform of Kitepower B.V. The aerodynamic pr...
Article
Full-text available
Airborne wind energy systems often use kites made of thin membranes to save material costs and increase mobility. However, this design choice increases the complexity of the aeroelastic behaviour of the system and demands high-fidelity tools. On the aerodynamic side of the multi-physics problem, it is quite challenging to create a high quality body...
Article
Full-text available
In this work we present Reynolds-averaged Navier-Stokes (RANS) simulations of the flow past the constant design shape of a leading-edge inflatable (LEI) wing. The simulations are performed with a steady-state solver using a k − ω SST turbulence model, covering a range of Reynolds numbers between 10 5 ≤ and ≤ 15 × 10 6 and angles of attack varying b...
Article
Full-text available
Airborne wind energy (AWE) systems harness energy at heights beyond the reach of tower-based wind turbines. To estimate the annual energy production (AEP), measured or modelled wind speed statistics close to the ground are commonly extrapolated to higher altitudes, introducing substantial uncertainties. This study proposes a clustering procedure fo...
Article
Full-text available
Kites can be used to harvest wind energy with substantially lower material and environmental footprints and a higher capacity factor than conventional wind turbines. In this paper, we present measurement data from seven individual tow tests with the kite system developed by Kyushu University. This system was designed for 7 kW traction power and com...
Presentation
Full-text available
Airborne wind energy (AWE) is the conversion of wind energy into electricity using tethered flying devices. Some concepts combine onboard wind turbines with a conducting tether, while others convert the pulling power of the flying devices on the ground. Replacing the tower of conventional wind turbines by a lightweight tether substantially reduces...
Article
Full-text available
Kites can be used to harvest wind energy at higher altitudes while using only a fraction of the material required for conventional wind turbines. In this work, we present the kite system of Kyushu University and demonstrate how experimental data can be used to train machine learning regression models. The system is designed for 7 kW traction power...
Preprint
Full-text available
Airborne wind energy (AWE) systems are tethered flying devices that harvest wind resources at higher altitudes which are not accessible to conventional wind turbines. In order to become a viable alternative to other renewable energy technologies, AWE systems are required to fly reliably and autonomously for long periods of time while being exposed...
Article
Full-text available
In this paper, we present an aero‐structural model of a tethered swept wing for airborne wind energy generation. The carbon composite wing has neither fuselage nor actuated aerodynamic control surfaces and is controlled entirely from the ground using three separate tethers. The computational model is efficient enough to be used for weight optimisat...
Article
Full-text available
A novel immersed boundary method based on a domain decomposition approach is proposed in the context of a finite element discretisation method. It is applicable to incompressible flows past rigid, deforming, or moving bodies. In this method, unlike most immersed boundary methods, strong boundary conditions are imposed in the regions of the computat...
Presentation
Full-text available
Roland Schmehl presenting at the Emerging Technologies Seminar "Airborne & Floating Wind" on Wednesday 5th February 2020 in Ostend, Belgium, at the GreenBridge business incubator and science park of Ghent University. Video recording available from https://youtu.be/QiYyCb5x2HA
Article
Full-text available
In this paper, we applied a system identification algorithm and an adaptive controller to a simple kite system model to simulate crosswind flight maneuvers for airborne wind energy harvesting. The purpose of the system identification algorithm was to handle uncertainties related to a fluctuating wind speed and shape deformations of the tethered mem...
Article
Full-text available
Airborne wind energy systems use tethered flying devices to harvest wind energy beyond the height range accessible to tower‐based wind turbines. Current commercial prototypes have reached power ratings of up to several hundred kilowatts, and companies are aiming at long‐term operation in relevant environments. As consequence, system reliability, op...
Preprint
Full-text available
Airborne wind energy (AWE) systems typically harness energy in an altitude range up to 500 m above the ground. To estimate the annual energy production (AEP), measured wind speed statistics close to the ground are commonly extrapolated to higher altitudes, introducing substantial uncertainties. This study proposes a clustering procedure for obtaini...
Preprint
Full-text available
In this paper we apply a system identification algorithm and an adaptive controller to a simple kite system model to simulate crosswind flight maneuvers for airborne wind energy harvesting. The purpose of the system identification algorithm is to handle uncertainties related to a fluctuating wind speed and shape deformations of the tethered membran...
Presentation
Full-text available
Airborne wind energy (AWE) is the conversion of wind energy into electricity using tethered flying devices. Some concepts combine onboard wind turbines with a conducting tether, while others convert the pulling power of the flying devices on the ground. Replacing the tower of conventional wind turbines by a lightweight tether substantially reduces...
Presentation
Welcome and Introduction to the Airborne Wind Energy Conference 2019
Article
Full-text available
This paper represents an expert view from Europe of future emerging technologies within the wind energy sector considering their potential, challenges, applications and technology readiness and how they might evolve in the coming years. These technologies were identified as originating primarily from the academic sector, some start-up companies and...
Article
A control scheme for drag power kites, also known as airborne wind turbines, for the entire wind speed range is proposed, including 1) a temperature controller allowing for temporary overloading of the powertrain; 2) a limitation controller ensuring that power, force, speed, and actuator constraints are satisfied; 3) a tangential flight speed contr...
Article
Full-text available
We present a computational fluid dynamic analysis of boundary layer transition on leading edge inflatable kite airfoils used for airborne wind energy generation. Because of the operation in pumping cycles, the airfoil is generally subject to a wide range of Reynolds numbers. The analysis is based on the combination of the shear stress transport tur...
Conference Paper
Full-text available
Airborne wind energy (AWE) is a novel renewable energy technology for harvesting wind energy by using kites. Compared to conventional wind turbines, the AWE systems use a lightweight structure which can reach higher altitudes where the winds are stronger and more persistent. In this work, we study the steady-state aerodynamics of a ram-air kite sec...