Active technique by suction to control the flow structure over a van model

Harinaldi,; Budiarso,; Warjito,; Kosasih, Engkos Achmad; Tarakka, Rustan; Simanungkalit, Sabar Pangihutan

doi:10.1063/1.4704356

Cited by 5 publications

(4 citation statements)

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“…The study investigates drag reduction occurring in a bluff body of van model adapted from Ahmed model, in which flow streams in reversed direction from the original model or in other names, reversed Ahmed model [23,[25][26][27][28]. The van model was equipped with an active control by applying blowing techniques.…”

Section: Methodsmentioning

confidence: 99%

Effect of blowing flow control and front geometry towards the reduction of aerodynamic drag on vehicle models

Tarakka¹,

Salam²,

Jalaluddin³

et al. 2019

FME Transactions

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This paper presents analyses of the effect of blowing flow control and variations on front geometry towards the reduction of aerodynamic drag on vehicle models. Blowing flow control is an alternative measure in modifying the onset of flow separation in the boundary layer on the surface of the vehicle. The modification is expected to reduce the dominating influence of the separation area on the total drag. Conducted in computational and experimental approaches, the research investigated the effect of frontal slant angle variations (θ) of 25°, 30° and 35° towards the reduction of aerodynamic drag on vehicle models on the application of blowing flow control with upstream and blowing speed of 16.7 m/s and 0.5 m/s, respectively. Load cells were used in the experimental method to validate the reduction of aerodynamic drag obtained from computational method. It is indicated that the effects of blowing flow control and variations on front geometry are significant in the increasing on pressure coefficients and the reduction of aerodynamic drag on vehicle models. The largest increase on pressure coefficients of 38.93% is indicated on the vehicle model with θ=35°, while the largest reduction of aerodynamic drag occurred on the same model with the values of 14.81 and 12.54 for computational and experimental methods, respectively.

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Section: Methodsmentioning

confidence: 99%

Effect of blowing flow control and front geometry towards the reduction of aerodynamic drag on vehicle models

Tarakka¹,

Salam²,

Jalaluddin³

et al. 2019

FME Transactions

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“…Hasil penelitian yang diperoleh menunjukkan peningkatan koefisien tekanan sebesar 26.50% dan pengurangan hambatan aerodinamika sebesar 14.74% untuk pendekatan komputasional dan 13.57% untuk pendekatan eksperimental [9]. [10]. Dengan berkurangnya wake maka akan berdampak positif terhadap peningkatan performa kendaraan secara keseluruhan [11].…”

Section: Pendahuluanunclassified

Kajian Aerodinamika Pada Model Kendaraan dengan Penerapan Kontrol Aktif Suction

et al. 2021

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As the air flow reaches the rear part of the vehicle the flow will undergo separation generated by friction and fluid viscosity, and creating wake, considerably large turbulent area with low pressure at the rear of the vehicle which results in pressure drag which can reduce vehicle performance. The research was carried out with a computational and experimental approach. The test model used in this study is a model of a family van model which is a modification of the Ahmed body model. The rear part of the vehicle model is equipped with an active control feature in the form of a suction with a slant angle (α) of 35  . The upstream speed and suction speed are 11.1 m/s and 0.5 m/s, respectively. The results obtained indicate that the application of active suction control is able to reduce wake formation and delay flow separation compared to the uncontrolled model, and is able to increase the minimum pressure coefficient on the rear wall of the vehicle model with an increase of 41.49%, and is able to reduce the drag coefficient by 11.0260% for the approach. computation and 11.0080% for the experimental approach.

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“…In another computational study, a passenger van is modeled with a modified form of Ahmed's body by changing the orientation of the flow from its original form (modified/reversed Ahmed Body). This model is equipped with suction and blowing on the rear side to comprehensively examine the pressure field modifications that occur in order to modify the near wall flow toward reducing of aerodynamics drag and stated that the application of active control by suction can reduce the aerodynamic drag of reversed Ahmed body up to 15.38% [14].…”

Section: Introductionmentioning

confidence: 99%

Modification of Flow Structure Over a Van Model by Suction Flow Control to Reduce Aerodynamics Drag

Harinaldi¹,

Budiarso²,

Warjito³

et al. 2012

MST

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Automobile aerodynamic studies are typically undertaken to improve safety and increase fuel efficiency as well as to find new innovation in automobile technology to deal with the problem of energy crisis and global warming. Some car companies have the objective to develop control solutions that enable to reduce the aerodynamic drag of vehicle and significant modification progress is still possible by reducing the mass, rolling friction or aerodynamic drag. Some flow control method provides the possibility to modify the flow separation to reduce the development of the swirling structures around the vehicle. In this study, a family van is modeled with a modified form of Ahmed's body by changing the orientation of the flow from its original form (modified/reversed Ahmed body). This model is equipped with a suction on the rear side to comprehensively examine the pressure field modifications that occur. The investigation combines computational and experimental work. Computational approach used a commercial software with standard kepsilon flow turbulence model, and the objectives was to determine the characteristics of the flow field and aerodynamic drag reduction that occurred in the test model. Experimental approach used load cell in order to validate the aerodynamic drag reduction obtained by computational approach. The results show that the application of a suction in the rear part of the van model give the effect of reducing the wake and the vortex formation. Futhermore, aerodynamic drag reduction close to 13.86% for the computational approach and 16.32% for the experimental have been obtained. Abstrak Modifikasi Struktur Aliran pada Model Kendaraan Van dengan Kontrol Aliran Hisapan untuk MengurangiHambatan Aerodinamika. Studi aerodinamika kendaraan biasanya berkaitan dengan keselamatan dan peningkatan efisiensi bahan bakar serta penemuan inovasi baru dalam teknologi kendaraan untuk mengatasi masalah krisis energi dan pemanasan global. Beberapa perusahaan mobil memiliki tujuan untuk mengembangkan solusi kontrol yang memungkinkan pengurangan hambatan aerodinamika kendaraan seiring dengan kemajuan modifikasi kendaraan yang masih dapat dilakukan dengan cara mengurangi massa, rolling friction atau hambatan aerodinamika. Beberapa metode kontrol aliran memberikan kemungkinan dalam memodifikasi pemisahan aliran untuk mengurangi terbentuknya swirling structure di sekitar kendaraan. Dalam studi ini, sebuah kendaraan keluarga dimodelkan dengan memodifikasi Ahmed body dengan mengubah orientasi aliran dari bentuk aslinya (modifikasi Ahmed body/reversed Ahmed body). Model ini dilengkapi dengan hisapan pada sisi belakang untuk memeriksa secara komprehensif perubahan medan tekanan yang terjadi. Penelitian dilakukan dengan pendekatan komputasi dan eksperimental. Pendekatan komputasi menggunakan perangkat lunak komersial dengan model turbulensi aliran k-epsilon standar dan bertujuan untuk mengetahui karakteristik medan aliran dan pengurangan hambatan aerodinamika yang terjadi pada model uji. Pendekatan eksperimental mengg...

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Active technique by suction to control the flow structure over a van model

Cited by 5 publications

References 0 publications

Effect of blowing flow control and front geometry towards the reduction of aerodynamic drag on vehicle models

Effect of blowing flow control and front geometry towards the reduction of aerodynamic drag on vehicle models

Kajian Aerodinamika Pada Model Kendaraan dengan Penerapan Kontrol Aktif Suction

Modification of Flow Structure Over a Van Model by Suction Flow Control to Reduce Aerodynamics Drag

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