A Correlation Study of Wind Tunnels for Reduced-Scale Automotive Aerodynamic Development

Meinert, Frank; Johannessen, Kristian; Saito, F.; Song, Bongha; Barlow, Jewel B.; Burton, David; Cho, Taehwan; Moraes, Luis Fernando Gouveia de

doi:10.4271/2016-01-1598

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…The reasons for this are the limited geometric fidelity of the scale models, the reduced Reynolds number and often also the absence of representative cooling air flows. 16 Nevertheless, the in-house experiences in the past have shown that trends and increments are well covered and consistent to the trends and results from the full-scale wind tunnels which is in line with the recent study of Meinert et al 17 Thus, the model wind tunnel is a very efficient tool for proportional and design studies because numerous proportion and styling variants can be examined in a short time, which is currently not possible within a comparable timeframe using CFD simulations.…”

Section: Development Processsupporting

confidence: 87%

The aerodynamic development of the new Porsche Cayenne

Wolf¹

2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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With significantly enhanced performance, the third generation of the Porsche Cayenne is even more closely oriented towards the principles of sports cars. In addition to improving the driving-dynamic characteristics, the aim of the development was to lower the drag as a contribution towards the reduction of fuel consumption and emissions. Increasing performance and a simultaneous reduction of drag are conflicting objectives, which led to a number of aerodynamic challenges during the development of the new Cayenne. In addition to detailed aerodynamic optimisations, the solution for the new Cayenne consisted of an extended adaptive aerodynamic concept, which enables a compromise between fuel consumption, performance, and comfort depending on the driving condition. The first part of the concept comprises an extended air flap system that, for the first time, enables complete closing of all cooling air inlets in the front end. The second part of the concept is reserved for the top-of-the-range V8 Turbo model and consists of a multifunctional deployable roof spoiler that adapts to the aerodynamic characteristics of the relevant driving condition and features an air-brake function as a highlight.

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Section: Development Processsupporting

confidence: 87%

The aerodynamic development of the new Porsche Cayenne

Wolf¹

2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Extensive experimental tests of full-scale prototypes presents some drawbacks, such as added complexity [3], extended assembling and test time [4], and consequently high cost [5] [6]. Downscale or reduced-scale (RS) modelling and testing allows partially overcoming the abovementioned drawbacks, since this approach offers a simpler and cost-effective solution, which has been successfully applied in different areas such as aeronautics [7], [8], aerodynamics [9], mechanical [10] and electrical engineering [11] or heat transfer [4], [12] among others. The design of reduced-scale tests has been greatly facilitated by the emergence of powerful computers and software [4], which currently have a deep impact on design capabilities and procedures.…”

Section: Introductionmentioning

confidence: 99%

Feasibility analysis of reduced‐scale visual corona tests in high‐voltage laboratories

Abomailek

Riba

Torrens

2019

IET Generation, Transmission & Distribution

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Corona is a critical effect that must be considered during the design and optimization stages of high-voltage hardware such as substation connectors, since due to the harmful effects, corona threats power systems reliability. Visual corona tests allow detecting and identifying the critical corona points on the surface of substation connectors, so corrective actions can be applied for product optimization. This paper focuses on reduced-scale visual corona tests intended to verify and optimize the behaviour of such high-voltage hardware. Reduced-scale visual corona tests allow reducing the voltage to be applied, laboratory size, instrumentation requirements, assembly and test times, and finally the overall costs of the tests compared to standard corona tests carried out in large-size high-voltage laboratories. A hybrid approach combining experimental tests and finite element method (FEM) simulations is presented, which allows obtaining the equivalent visual corona onset voltage between reduced-scale and full-scale tests. Although the paper focuses on the analysis of aluminium substation connectors, the proposed approach can be applied to many other hardware intended for high-voltage applications.

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“…Reduced scale models, have been applied extensively in fields such as aerodynamics [10] and aeronautics [11], [12]. In the aeronautics area, subscale models are nowadays considered as an essential, valuable and viable design tools [11].…”

Section: Introductionmentioning

confidence: 99%

Application of reduced scale tests to improve the thermal performance of high-voltage substation connectors

Abomailek

Riba

Torrens

2018

Experimental Heat Transfer

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The thermal behavior of high-voltage substation connectors is a critical aspect that must be considered during the design stage. Most research about the thermal performance of substation connector devices is based on full scale models. This paper proposes a downscaling method to evaluate the thermal performance of reduced scale substation connectors. The theoretical results attained in this paper were validated by means of FEM simulations and experimental tests. Reduced scale simulation and testing will be an essential tool for assessing the thermal performance of substation connectors and other electrical equipment during the design and validation stages.

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A Correlation Study of Wind Tunnels for Reduced-Scale Automotive Aerodynamic Development

Cited by 4 publications

References 3 publications

The aerodynamic development of the new Porsche Cayenne

The aerodynamic development of the new Porsche Cayenne

Feasibility analysis of reduced‐scale visual corona tests in high‐voltage laboratories

Application of reduced scale tests to improve the thermal performance of high-voltage substation connectors

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