Enhanced Investigations of High-Performance SI-Engines by Means of 3D-CFD Simulations

2015 ◽  
Author(s):  
Marlene Wentsch ◽  
Antonella Perrone ◽  
Marco Chiodi ◽  
Michael Bargende ◽  
Donatus Wichelhaus
Keyword(s):  
High Performance ◽  
Cfd Simulations ◽  
Si Engines

Experimental and numerical approaches for the quantification of tumble intensity in high-performance SI engines

2017 ◽  
Vol 138 ◽  
pp. 435-451 ◽  
Author(s):  
Mirko Baratta ◽  
Daniela Misul ◽  
Ezio Spessa ◽  
Ludovico Viglione ◽  
Giorgio Carpegna ◽  
...  
Keyword(s):  
High Performance ◽  
Si Engines ◽  
Numerical Approaches

Thermal Optimization of Exhaust-Based Thermoelectric Generator

2013 ◽  
Vol 743-744 ◽  
pp. 88-93 ◽  
Author(s):  
Ya Dong Deng ◽  
Shan Chen ◽  
Xun Liu
Keyword(s):  
Heat Exchanger ◽  
Thermal Performance ◽  
High Performance ◽  
Thermoelectric Generator ◽  
Thermal Characteristics ◽  
Interface Temperature ◽  
Cfd Simulations ◽  
Exhaust Heat ◽  
Internal Structures ◽  
Plate Shape

The potential for automotive exhaust heat based thermoelectric generator (TEG) has been increased with continuously advances in thermoelectric technology. The thermal performance of the heat exchanger in exhaust-based TEG was analyzed. In terms of interface temperature and thermal uniformity, the thermal characteristics of the heat exchangers with different internal structures, materials and thicknesses were discussed. CFD simulations and infrared experiments on a high-performance production engine with a dynamometer were carried out. It was proved that the plate-shape heat exchanger made of brass with internal baffles and the thickness of 3mm, obtained a relatively optimal thermal performance, and it will help to improve the thermal performance of the TEG.

scholarly journals Effect of Ducted Multi-Propeller Configuration on Aerodynamic Performance in Quadrotor Drone

Drones ◽  
2021 ◽  
Vol 5 (3) ◽  
pp. 101
Author(s):  
Yi Li ◽  
Koichi Yonezawa ◽  
Hao Liu
Keyword(s):  
Optimal Design ◽  
High Performance ◽  
Lift Force ◽  
Force Production ◽  
Aerodynamic Performance ◽  
Aerodynamic Design ◽  
Cfd Simulations ◽  
Height Difference ◽  
Noticeable Effect ◽  
Propeller Design

Motivated by a bioinspired optimal aerodynamic design of a multi-propeller configuration, here we propose a ducted multi-propeller design to explore the improvement of lift force production and FM efficiency in quadrotor drones through optimizing the ducted multi-propeller configuration. We first conducted a CFD-based study to explore a high-performance duct morphology in a ducted single-propeller model in terms of aerodynamic performance and duct volume. The effect of a ducted multi-propeller configuration on aerodynamic performance is then investigated in terms of the tip distance and the height difference of propellers under a hovering state. Our results indicate that the tip distance-induced interactions have a noticeable effect in impairing the lift force production and FM efficiency but are limited to small tip distances, whereas the height difference-induced interactions have an impact on enhancing the aerodynamic performance over a certain range. An optimal ducted multi-propeller configuration with a minimal tip distance and an appropriate height difference was further examined through a combination of CFD simulations and a surrogate model in a broad-parameter space, which enables a significant improvement in both lift force production and FM efficiency for the multirotor, and thus provides a potential optimal design for ducted multirotor UAVs.

scholarly journals Benefits of Higher-Temperature Operation in Boosted SI Engines Enabled by Advanced Materials

2018 ◽  
Author(s):  
Zachary G. Mills ◽  
Charles E. A. Finney ◽  
K. Dean Edwards ◽  
J. Allen Haynes
Keyword(s):  
Power Density ◽  
High Speed ◽  
High Performance ◽  
Direct Injection ◽  
Fuel Efficiency ◽  
Advanced Materials ◽  
Valuable Insight ◽  
Light Duty ◽  
Selective Cooling ◽  
Si Engines

To meet the demand for greater fuel efficiency in passenger vehicles, various strategies are employed to increase the power density of light-duty SI engines, with attendant thermal or system efficiency increases. One approach is to incorporate higher-performance alloys for critical engine components. These alloys can have advantageous thermal or mechanical properties at higher temperatures, allowing for components constructed from these materials to meet more severe pressure and temperature demands, while maintaining durability. Advanced alloys could reduce the need for charge enrichment to protect certain gas-path components at high speed and load conditions, permit more selective cooling to reduce heat-transfer losses, and allow engine downsizing, while maintaining performance, by achieving higher cylinder temperatures and pressures. As a first step in investigating downsizing strategies made possible through high-performance alloys, a GT-Power model of a 4-cylinder 1.6L turbocharged direct-injection SI engine was developed. The model was tuned and validated against experimental dynamometer data collected from a corresponding engine. The model was then used to investigate various operating strategies for increasing power density. Results from these investigations will provide valuable insight into how new materials might be utilized to meet the needs of future light-duty engines and will serve as the basis for a more comprehensive investigation using more-detailed thermo-mechanical modeling.

scholarly journals FluidSim: Modular, Object-Oriented Python Package for High-Performance CFD Simulations

2019 ◽  
Vol 7 ◽  
Author(s):  
Ashwin Vishnu Mohanan ◽  
Cyrille Bonamy ◽  
Miguel Calpe Linares ◽  
Pierre Augier
Keyword(s):  
High Performance ◽  
Object Oriented ◽  
Cfd Simulations ◽  
Python Package

High Performance Computing: Analytical Aerodynamics for Automotive Vehicles

1999 ◽  
Author(s):  
Ronald H. Miller ◽  
Gary S. Strumolo ◽  
Evangelos Hytopoulos ◽  
Stephen A. Remondi ◽  
Samuel M. Watson
Keyword(s):  
Wind Tunnel ◽  
Parallel Algorithms ◽  
High Performance Computing ◽  
High Performance ◽  
Experimental Testing ◽  
Computer Architectures ◽  
Wind Tunnels ◽  
Cfd Simulations ◽  
Design Time ◽  
Performance Computing

Abstract High Performance Computing (HPC) represents a significant resource whereby automotive manufacturers can utilize analytical methodologies to reduce experimental testing and design time, resulting in lower costs and higher quality. Optimization of styling and aerodynamics requires multiple CFD simulations which have been enabled by the commercial availability of parallel algorithms, as well as enhancements in computer architectures. We have developed a Virtual Aerodynamic Wind Tunnel (VAWT) which uses PowerFLOW® and can simulate conditions similar to experimental wind tunnels. One key element of this methodology is the use of PowerFLOW. Two of the major attributes of PowerFLOW are its inherent parallelization and automeshing capabilities. In this paper, we will focus on the scalability and feasibility of PoweFLOW, which is essential for the optimization of styling and aerodynamics. Timing and scalability results on an Origin 2000 server are presented for a number of different configurations.

High performance CFD simulations of sloshing in a moving tank with SPH method

2021 ◽  
Author(s):  
T. Arslan ◽  
M. Ozbulut ◽  
J. Ragunathan ◽  
J. Valstad ◽  
J. C. Meyer
Keyword(s):  
High Performance ◽  
Cfd Simulations ◽  
Sph Method

Impeller–Vaned Diffuser Interaction in a Centrifugal Compressor at the Best Efficiency Point

2011 ◽  
Author(s):  
P. Gaetani ◽  
G. Persico ◽  
A. Mora ◽  
V. Dossena ◽  
C. Osnaghi
Keyword(s):  
Centrifugal Compressor ◽  
High Performance ◽  
Fluid Dynamic ◽  
Fast Response ◽  
Cfd Simulations ◽  
Vaned Diffuser ◽  
Power Exchange ◽  
Complex Fluid ◽  
Point Data ◽  
Aero Engines

Centrifugal compressors find a huge number of applications in industry and in aero-engines; the detailed comprehension of the complex fluid-dynamic mechanisms occurring in these machines is crucial to improve their efficiency and their operating range. The paper presents a study on the impeller–vaned diffuser interaction in a high-performance compressor stage, in the frame of a wide experimental campaign devoted to the comprehension of unsteady flows in centrifugal compressor stages. The paper focuses on the best efficiency operating point. Data were collected in the impeller–vaned diffuser gap by applying a fast response probe. The impeller runs at 12500 RPM and the peripheral Mach number is 0.77. At first, data are reduced to highlight the main flow structures released by the impeller. CFD simulations — first verified against experimental data — were also performed to get detailed information of the flow field inside the impeller. The core of the paper is the discussion of the impeller–diffuser interaction. Results evidence the effect of the diffuser on the impeller in terms of static pressure and flow velocity. Moreover, the interaction process makes the average flow rate discharged by an impeller channel and the power exchange to be unsteady.

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