Drag Reduction of Truck and Trailer Combination with Different Passive Flow Control Methods

Year 2024, Volume: 44 Issue: 2, 374 - 381, 01.11.2024

Cihan Bayındırlı , Yahya Erkan Akansu

https://doi.org/10.47480/isibted.1515727

Abstract

In this study, drag force and surface pressure measurements were conducted on a 1/32 scaled truck-trailer combination model. The experimental tests were carried out between the ranges of 312×103- 844×103 Reynolds Numbers in a suction type wind tunnel. The aerodynamic drag coefficient (CD) and distribution of pressure coefficient (CP) were experimentally determined on the truck and trailer combination. The regions where has big pressure coefficients were determined on the truck-trailer by using flow visualizations. The aerodynamic structure of truck-trailer combination models was improved by passive flow control methods on 4 different models. By using newly designed spoiler on the model 1, drag coefficient was reduced 10.01 %. On the model 2, adding trailer rear extension with a spoiler, the reduction was obtained as 11.35 %. For the model 3 which is obtained adding side skirt to model 2, the improvement reached 18.85 %. The model 4 was composed of model 2 and a bellow between the truck and trailer. The drag force improvement was obtained as 22.80 % for model 4.

Keywords

Drag force, wind tunnel, passive flow control, truck-trailer, drag coefficient

Drag Reduction of Truck and Trailer Combination with Different Passive Flow Control Methods

Abstract

In this study, drag force and surface pressure measurements were conducted on a 1/32 scaled truck-trailer combination model. The experimental tests were carried out between the ranges of 312×103- 844×103 Reynolds Numbers in a suction type wind tunnel. The aerodynamic drag coefficient (CD) and distribution of pressure coefficient (CP) were experimentally determined for the truck and trailer combination. The regions with a large amount of pressure coefficients were determined on the truck-trailer by using flow visualizations. The aerodynamic structure of truck-trailer combination models was improved by passive flow control methods on 4 different models. By using a newly designed spoiler on Model 1, the drag coefficient was reduced by 10.01 %. On Model 2, after adding a trailer rear extension with a spoiler, the reduction was obtained at 11.35 %. For the model 3 which is obtained by adding a side skirt to model 2, the improvement reached 18.85 %. The model 4 was composed of model 2 and a bellow between the truck and trailer. The drag force improvement was obtained at 22.80 % for Model 4.

Keywords

Drag force, wind tunnel, passive flow control, truck-trailer, drag coefficient

Thanks

This study was prepared as a part of Cihan Bayindirli’s Doctoral Thesis. (Advisor: Prof. Dr. M. Sahir SALMAN) The writers thank for their support.

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