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Active Flow Control for Reducing Drag on Trucks: from Concept to Full Scale Testing

Guglielmo Minelli (Institutionen för mekanik och maritima vetenskaper, Strömningslära)
Gothenburg : Chalmers University of Technology, 2017. ISBN: 978-91-7597-662-4.
[Doktorsavhandling]

There is no doubt that road vehicle transportation is needed to improve efficiency, to reduce power consumption and to contribute to a sustainable mobility. Aerodynamics plays a crucial role in this, and its optimization can have a significant impact on fuel efficiency. The work reported in this thesis thus investigates the applicability of an active flow control technique able to improve the aerodynamic performance of trucks.
CFD simulations and wind tunnel experiments are conducted to explore the potential of such a device. The process starts with a preliminary LES study (Re = 1 × 10^5 ) and ends with a proof of concept full scale test of a real truck (Re = 3.5 × 10^6 ). The PANS method and scaled model wind tunnel experiments were essential to bridge the initial preliminary findings to the final full scale test. PANS was first validated (using in-house experimental data and data from test cases) and then used to simulate the efficacy of AFC at higher Re (Re = 5 × 10^5 ), introducing realistic flow conditions (wind gusts).
In addition, wind tunnel experiments of a scaled, simplified truck cabin were used to demonstrate the applicability of the control.
The results focus on two main points. First, synthetic jets were shown to be an effective and low energy consumption technique to control a pressure induced separated flow and for reducing drag on trucks. Second, PANS was shown to be an interesting method for industrial applications. Its capability to resolve unsteady flow cases preserving the accuracy of the flow structures prediction is shown, even when meshes are relatively coarse.

Nyckelord: Large Eddy Simulations, PIV,Vehicle Aerodynamics, PANS, Proper Orthogonal Decomposition, POD, Wind Tunnel, Experiments, Active Flow Control, AFC, Partially-Averaged Navier-Stokes, LES



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Denna post skapades 2017-11-21. Senast ändrad 2017-11-21.
CPL Pubid: 253277

 

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Institutioner (Chalmers)

Institutionen för mekanik och maritima vetenskaper, Strömningslära

Ämnesområden

Transport
Rymd- och flygteknik
Farkostteknik
Strömningsmekanik och akustik

Chalmers infrastruktur

Relaterade publikationer

Inkluderade delarbeten:


Partially-averaged Navier–Stokes simulations of two bluff body flows


Numerical Investigation of Active Flow Control Around a Generic Truck A-Pillar


Aerodynamic flow control for a generic truck cabin using synthetic jets


Validation of PANS and active flow control for a generic truck cabin


Examination

Datum: 2017-12-08
Tid: 10:00
Lokal: KB-salen, Kemigården 4, Chalmers.
Opponent: Prof. Dr.-Ing. Suad Jakirlic, Institute of Fluid Mechanics and Aerodynamics/Center of Smart Interfaces, Technische Universität Darmstadt, Germany.

Ingår i serie

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie 4343