Aerodynamic flow control for a generic truck cabin using synthetic jets

Minelli, Guglielmo; Hartono, Erwin Adi; Chernoray, Valery; Hjelm, Linus; Krajnović, Siniša

doi:10.1016/j.jweia.2017.05.006

Cited by 26 publications

(10 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results collected in the previous section are further used as an input to recreate a proof of concept case that shows the effectiveness of streamwise slots at a higher Reynolds number. The model chosen for the experiments was the one used in previous experimental [7] and numerical [8,29] works. Tufts visualizations and PIV, supported by force measurements, are used to evaluate the effectiveness of different control solutions.…”

Section: Experimental Results: Proof Of Concept At Re = 5 × 10mentioning

confidence: 99%

“…The second model ( Fig. 2, with W exp = H exp = 0.4 m), used for the experiments at Re = 5×10 5 , was already used and described in [7]. Also in this case, a new set of A-pillars have been designed to investigate the slots location and distribution.…”

Section: The Numerical and Experimental Modelsmentioning

confidence: 99%

“…In order for the simulations to be consistent with the experiments, F + = 3 is used for the actuation of all cases. The effect of different frequencies was previously investigated in [7] and [20] for the vertical slot configuration and it would be of great importance to study their effect in the streamwise slot case. However, investigating the influence of different frequencies would go beyond the main goal of this study, which is to investigate the main effect of orientation and position of the actuation slots.…”

Section: The Momentum Coefficient C ηmentioning

confidence: 99%

“…the gap between tractor and trailer, the wheel housing and the under body or the rear side) and all these areas contribute to an aerodynamic drag increase and to the creation of noise and soiling on the side windows [1]. Concerning trucks, a multitude of techniques have been developed during the years, from passive [2,3] to active [4][5][6][7][8] flow control strategies. Specifically, this work focuses on an active flow control (AFC) strategy to suppress the pressure induced flow separation that appears at the vertical front rounded corners of a truck cabin, generally called A-pillars.…”

Section: Introductionmentioning

confidence: 99%

“…In parallel to these techniques, synthetic jet actuators have shown to be extremely effective, especially for pressure induced separating flows. This work, in particular, aims to follow up the previously published large eddy simulations (LES) [20] and experimental [7] works. In these two studies, an AFC was implemented both numerically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Active Aerodynamic Control of a Separated Flow Using Streamwise Synthetic Jets

Minelli

Tokarev

Zhang

et al. 2019

Flow Turbulence Combust

Self Cite

View full text Add to dashboard Cite

LES simulations at Re = 1 × 10 5 and wind tunnel experiments at Re = 5 × 10 5 were conducted to investigate the beneficial effect of an active flow control (AFC) technique on the aerodynamic performance of a simplified truck geometry. The paper involves the investigation of a synthetic jet actuator characterized by periodic blowing and suction that defines a zero net mass flux flow control mechanism. The actuation aims to suppress the flow separation occurring at the A-pillar (front rounded corner) of a truck cabin. The work flow is defined as it follows. First, LES at low Reynolds number are conducted for different disposition of the actuation slots. The results show a beneficial effect when the actuation slots are positioned in streamwise direction compared to spanwise (vertical) direction. Second, based on the previous considerations, wind tunnel experiments are conducted to verify and support the numerical findings. Both numerical solutions and experimental data show the same trend and the superiority of the streamwise slots actuation when compared to traditional vertical slot actuation. In particular, this work shows the weakness of a vertical slot actuation, when its location is not optimized. A small change in its positioning greatly worsen the efficacy of the separation control in terms of drag reduction and separation bubble length. The slot location directly affects the length of the separated flow region which its reduction can vary between 40-70% based on the positioning. Conversely, a streamwise actuation, spanning a larger portion of the curvature of a rounded A-pillar, is not affected by this behaviour and contributes up to 80% of the recirculation bubble reduction measured in the unactuated case. The effect of the location change and the orientation of a zero net mass flux jet slot is therefore investigated and discussed in this work.

show abstract

Section: Experimental Results: Proof Of Concept At Re = 5 × 10mentioning

confidence: 99%

Section: The Numerical and Experimental Modelsmentioning

confidence: 99%