Effect of Flow Separation Control with Suction Velocity Variation: Study of Flow Characteristics, Pressure Coefficient, and Drag Coefficient

Rauf, Wawan; Tarakka, Rustan; Jalaluddin,; Ihsan, Muhammad

doi:10.13189/ujme.2020.080302

Cited by 5 publications

(2 citation statements)

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“…Model uji ditampilkan pada gambar 1. Riset sebelumnya menunjukkan bahwa daerah separasi aliran yang berkontribusi besar terhadap total hambatan aerodinamika berada pada sisi atas bagian belakang kendaraan (Rauf et al, 2020). Separasi aliran tersebut menciptakan aliran balik sehingga muncul tekanan negatif pada dinding belakang yang berkontribusi 80% dari total hambatan aerodinamika kendaraan (Nizam Sudin et al, 2014).…”

Section: Metodeunclassified

Kajian Komputasi Dan Eksperimental Pengaruh Kontrol Aktif Terhadap Hambatan Aerodinamika Model Kendaraan

Rauf¹,

Rifal²,

Boli³

2022

RADIAL

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Abstrak: Kajian Komputasi dan Eksperimental Pengaruh Kontrol Aktif terhadap HambatanAerodinamika Model Kendaraan. Dinamika aliran udara sangat dipengaruhi oleh pembentukan separasi di sekitar bodi kendaraan. Separasi aliran menjadi pemicu perbedaan tekanan yang signifikan antara sisi depan dan belakang sehingga muncul efek tarikan ke arah belakang sebagai kontributor utama besarnya hambatan aerodinamika yang diterima kendaraan. Penelitian ini fokus pada kajian hambatan aerodinamika dengan memperhatikan karakteristik pola aliran yang terbentuk dan distribusi tekanan pada dinding belakang model kendaraan melalui metode simulasi komputasi dan eksperimental laboratorium. Kontrol aktif tiupan ditempatkan pada sisi atas dinding belakang Ahmed model dan diatur pada kecepatan 1.5 m/s. Hasilnya menunjukkan bahwa penggunaan kontrol aktif tiupan pada sisi belakang mampu menunda separasi, meningkatkan koefisien tekanan, dan mengurangi hambatan aerodinamika model kendaraan. Abstract: Computational and Experimental Studies of the Effect of Active Control on Aerodynamic Drag of Vehicle Models. The dynamics of air flow is strongly influenced by the formation of separations around the vehicle body. The flow separation triggers a significant pressure difference between the front and rear sides so that a rearward pull effect appears as the main contributor to the amount of aerodynamic drag received by the vehicle. This research focuses on the study of aerodynamic resistance by paying attention to the characteristics of the flow pattern formed and the pressure distribution on the rear wall of the vehicle model through computational simulation methods and laboratory experiments. The blowing active control is located on the upper side of the back wall of the Ahmed model and is set at a speed of 1.5 m/s. The results show that the use of blowing active control on the rear side is able to delay separation, increase the pressure coefficient, and reduce the aerodynamic drag of the vehicle model.

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Section: Metodeunclassified

Kajian Komputasi Dan Eksperimental Pengaruh Kontrol Aktif Terhadap Hambatan Aerodinamika Model Kendaraan

Rauf¹,

Rifal²,

Boli³

2022

RADIAL

Self Cite

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“…The synthetic jet near the rear windows effectively suppresses the separation and reduces drag max by 13% (Leclerc and Kourta, 2011). A suction slot on top of rear window eliminates the flow separation and reduces the drag by 17% (Roumeas et al , 2009; Prakash et al , 2018; Wawan et al , 2020). The combined transverse direction blowing jet and suction on rear window reattaches the flow and gives a drag reduction of 13% (Bruneau et al , 2011; Jahanmiri and Abbaspour, 2011).…”

Section: Introductionmentioning

confidence: 99%

Flow control of a vehicle using reverse flow fan

Raj Mohamed,

2023

AEAT

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Purpose This study aims to achieve optimum flow separation control for a road vehicle using a reverse flow fan on rear side. Design/methodology/approach A full-length reverse flow fan array (fan’s air speed is 50% of the car’s speed) is attached throughout the width of the vehicle at rear edge corner. Findings The reverse flow fan array positioned at rear edge of car pushes the airflow against the car’s rear window. It creates the recirculation region and alters the pressure distribution. This reduces the lift coefficient by 150%, which becomes the downforce and reduces the drag coefficient by 22%. As the car speed increases, fan speed should also be increased for effective flow control. Research limitations/implications This active flow control method for 3D Ahmed car body has been studied computationally at low speed (40 m/s). Practical implications This design increases the downforce, thus gives better cornering speed and stability, and decreases the drag which improves fuel efficiency. It can be used for effective flow control of cars (hatchback/sedan). The findings can be applied to the bluff bodies, road vehicles, UAV and helicopter fuselage for flow separation control. Originality/value The fan array is attached on car’s rear side, which blows air against the car’s rear window. It alters the pressure distribution and aerodynamics forces favorably. But the existing high-speed fan used in a sports cars sucks the air from bottom and pushes it rearward, which increases both the traction force and drag.

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Analysis of the effect of rear-window tilt on aerodynamic drags of sedan vehicle model

Salam¹,

Tarakka²,

Rudiansyah³

et al. 2023

Proceeding of International Conference on Energy, Manufacture, Advanced Material and Mechatronics 2021

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Effect of Flow Separation Control with Suction Velocity Variation: Study of Flow Characteristics, Pressure Coefficient, and Drag Coefficient

Cited by 5 publications

References 0 publications

Kajian Komputasi Dan Eksperimental Pengaruh Kontrol Aktif Terhadap Hambatan Aerodinamika Model Kendaraan

Kajian Komputasi Dan Eksperimental Pengaruh Kontrol Aktif Terhadap Hambatan Aerodinamika Model Kendaraan

Flow control of a vehicle using reverse flow fan

Analysis of the effect of rear-window tilt on aerodynamic drags of sedan vehicle model

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