Publications related to Engine efficiency

A physics-based model for wind turbine wake expansion in the atmospheric boundary layer

Analytical wind turbine wake models are widely used to predict the wake velocity deficit. In these models, the wake growth rate is a key parameter specified mainly with empirical formulations. In this study, a new physics-based model is proposed and valida ...

2022

Large-eddy simulation of a wind-turbine array subjected to active yaw control

Fernando Porté Agel, Mou Lin

This study validates large-eddy simulation (LES) for predicting the flow through a wind turbine array subjected to active yaw control. The wind turbine array consists of three miniature wind turbines operated in both non-yawed and yawed configurations unde ...

COPERNICUS GESELLSCHAFT MBH2022

Robust control for an electromagnetic actuator for a camless engine

Zlatina Kirilova Dimitrova

The increase of the effective efficiency of the internal combustion engines is important for the fuel consumption reduction and the CO2 emission reduction. The variable engine valve trains are important for the gas exchanges and influence directly the effe ...

PERGAMON-ELSEVIER SCIENCE LTD2019

A Simple Physically-Based Model for Wind-Turbine Wake Growth in a Turbulent Boundary Layer

Fernando Porté Agel, Wai Chi Cheng

The growth rate of wind-turbine wakes in the atmospheric boundary layer is a key parameter in analytical models used to predict wind-turbine wakes and their effects in wind farms. To date, the turbine-wake growth rate is determined empirically, owing to ou ...

2018

Towards optical optimization of planar monolithic perovskite/silicon-heterojunction tandem solar cells

Michael Graetzel, Ulf Anders Hagfeldt, Michael Saliba, Juan-Pablo Correa-Baena

Combining inorganic-organic perovskites and crystalline silicon into a monolithic tandem solar cell has recently attracted increased attention due to the high efficiency potential of this cell architecture. Promising results with published efficiencies abo ...

Iop Publishing Ltd2016

Potential of Small-Scale Turbomachinery for Waste Heat Recovery on Automotive Internal Combustion Engines

Jürg Alexander Schiffmann, Eliott Philippe Guenat, Violette Mounier, Kévin Rosset

This paper investigates the waste heat recovery potential of internal combustion engines, using organic Rankine cycles running on small-scale radial turbomachinery. ORC are promising candidates for low-grade thermal sources and the use of dynamic expanders ...

2015

Large-eddy simulation of the diurnal variation of wake flows in a finite-size wind farm

Fernando Porté Agel, Mahdi Abkar, Ahmad Sharifi

In this study, large-eddy simulation (LES) is used to study the evolution of the wind-turbine wakes and their effects on power losses inside an idealized finite-size wind farm in the course of a full diurnal cycle. In the LES, turbulent subgrid-scale stres ...

Iop Publishing Ltd2015

Large-eddy simulation of the diurnal variation of wake flows in a finite-size wind farm

Fernando Porté Agel, Mahdi Abkar, Ahmad Sharifi

In this study, large-eddy simulation (LES) is used to study the evolution of the wind-turbine wakes and their effects on power losses inside an idealized finite-size wind farm in the course of a full diurnal cycle. In the LES, turbulent subgrid-scale stres ...

2015

The effect of atmospheric stability on wind-turbine wakes: A large-eddy simulation study

Fernando Porté Agel, Mahdi Abkar

In this study, large-eddy simulation is used to investigate the influence of atmospheric stability on wind-turbine wakes. In the simulations, tuning-free Lagrangian scale-dependent dynamic models are used to model the subgrid-scale turbulent fluxes, while ...

IOP Publishing Ltd2014

Interaction between large wind farms and the atmospheric boundary layer

Fernando Porté Agel, Yu-Ting Wu, Hao Lu

Accurate prediction of atmospheric boundary layer (ABL) flow and its interactions with wind turbines is of great importance for optimizing the design and efficiency of wind farms. This study first focuses on recent efforts to develop and validate a large-e ...

Elsevier2014

Engine efficiency

A physics-based model for wind turbine wake expansion in the atmospheric boundary layer

Large-eddy simulation of a wind-turbine array subjected to active yaw control

Robust control for an electromagnetic actuator for a camless engine

A Simple Physically-Based Model for Wind-Turbine Wake Growth in a Turbulent Boundary Layer

Towards optical optimization of planar monolithic perovskite/silicon-heterojunction tandem solar cells

Potential of Small-Scale Turbomachinery for Waste Heat Recovery on Automotive Internal Combustion Engines

Large-eddy simulation of the diurnal variation of wake flows in a finite-size wind farm

Large-eddy simulation of the diurnal variation of wake flows in a finite-size wind farm

The effect of atmospheric stability on wind-turbine wakes: A large-eddy simulation study

Interaction between large wind farms and the atmospheric boundary layer

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A physics-based model for wind turbine wake expansion in the atmospheric boundary layer

Towards optical optimization of planar monolithic perovskite/silicon-heterojunction tandem solar cells

Large-eddy simulation of the diurnal variation of wake flows in a finite-size wind farm

Robust control for an electromagnetic actuator for a camless engine

A Simple Physically-Based Model for Wind-Turbine Wake Growth in a Turbulent Boundary Layer

Large-eddy simulation of the diurnal variation of wake flows in a finite-size wind farm

The effect of atmospheric stability on wind-turbine wakes: A large-eddy simulation study

Potential of Small-Scale Turbomachinery for Waste Heat Recovery on Automotive Internal Combustion Engines

Large-eddy simulation of a wind-turbine array subjected to active yaw control

Interaction between large wind farms and the atmospheric boundary layer