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All Journal APPROACH: Jurnal Teknologi Penerbangan Jurnal Penelitian Prosiding SNITP (Seminar Nasional Inovasi Teknologi Penerbangan) Journal of Public Transportation Community
Gunawan Sakti
Politeknik Penerbangan Surabaya
Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Journal : APPROACH: Jurnal Teknologi Penerbangan

 1 
KARAKTERISTIK ALIRAN FLUIDA UNTUK PENGGUNAAN VORTEX GENERATOR DENGAN POSISI STRAIGHT PADA WING AIRFOIL NACA 0012 Wawan Aries Widodo; Setyo Hariyadi; Bambang Junipitoyo; Gunawan Sakti; Supriadi Supriadi
Approach : Jurnal Teknologi Penerbangan Vol. 3 No. 1 (2019): April 2019
Publisher : Politeknik Penerbangan Surabaya

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Abstract

Wings on an airplane have a very large effect on the formation of lift in all parts. From the wingtip area to the wingroot section, everything that happens between these parts will have an effect on the amount of lift produced. The use of vortex generators has a big influence with a small form of modification in the upper surface. The separation delay is an indication of the important things that are produced in its use. With this separation delay, the lift force will be greater and the drag force will be smaller. This is because the flow is better able to withstand friction and adverse pressure gradients. This study examines the flow across the NACA 0012 airfoil with the addition of a vortex generator. The vortex generator profile used is a flat plate vortex generator with a straight configuration and placed at x / c = 10% chord line direction from the leading edge. The variations used are the Reynolds (Re) number and the attack angle (α) on the airfoil. The freestream speed used is the speed of 12 m / s, and at the angle of attack (α) 0o, 3o, 6o, 9o, 12o, 15o, 17o, 19o, and 20o. The parameters evaluated included pressure coefficient (Cp), speed profile, lift coefficient, drag coefficient, and CL/CD ratio. The results of this study indicate that there was an increase in performance of the NACA 0012 airfoil with the addition of a vortex generator compared to without the use of a vortex generator. With the vortex generator more separation can be delayed. In this study also shows that the shape and arrangement of vortex generators play an important role in delaying separation.
INVESTIGASI NUMERIK PENGURANGAN GAYA DRAG PADA PIPA ENGINE OIL COOLER NUMERICAL INVESTIGATION OF DRAG FORCE REDUCTION ON THE ENGINE OIL COOLER TUBE Gunawan Sakti; Surya Cakra; Bambang Junipitoyo
Approach : Jurnal Teknologi Penerbangan Vol. 3 No. 2 (2019): Oktober 2019
Publisher : Politeknik Penerbangan Surabaya

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The effort to reduce the drag force on a cylinder is a research that is still popularly carried out by many researchers today. This reduction of drag force is very useful and widely used in the design of heat exchanger pipes, offshore construction piles and bridge piles. This drag forces reducing were carried out using Ansys Fluent® numerical simulation with the geometry of the main cylinder being D = 60 mm, the diameter of the cylinder bluff body d = 0.5D, given the variation of the distance between the center points between the two cylinders is 1.2≤s / D≤1.4 and the Reynold number Re = 5.3 x 104 at free stream velocity U ͚ = 14 m / s. This numerical simulation is also given the turbulent variation of the k-epsilon (2eq), k-omega (2eq) transition model and the k-kl-omega (3eq) transition to obtain numerical simulation results that are close to experimental data. The results of this research are expected to show better aerodynamic performance improvements. The analysis is carried out by comparing several measuring parameters between a single cylinder without disturbance and a cylinder with a disturbance. Some of the considerations used in this aerodynamic performance analysis are Cp, pressure distribution on the main cylinder wall, Cd, Cl and visualization of velocity and pressure contours.
STUDI NUMERIK PENGURANGAN GAYA DRAG PIPA SILINDER PADA HEAT EXCHANGER DENGAN MENEMPATKAN PIPA SILINDER TIPE I-530 NUMERICAL INVESTIGATION OF DRAG FORCE REDUCTION ON THE HEAT EXCHANGER WITH PLACEMENT OF I-53⁰ TYPE CYLINDER Verdian Kurniawan; Gunawan Sakti; Bambang Junipitoyo
Approach : Jurnal Teknologi Penerbangan Vol. 4 No. 2 (2020): Oktober 2020
Publisher : Politeknik Penerbangan Surabaya

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Abstract

Penelitian ini adalah penelitian dasar yang menitik beratkan pada upaya penurunan gaya drag pada sebuah pipa silinder pada sebuah heat exchanger dengan penempatan silinder pengganggu pada area arah aliran datang. Karakteristik aerodinamika daripada silinder utama dan pengganggunya dimodelkan secara 2D dengan menggunakan Ansys Fluent® pada aliran laminar. Upaya penurunan gaya drag dilakukan dengan diameter silinder utama D = 60 mm, dengan tipe silinder pengganggu I-530 dengan jarak antar titik pusat kedua silinder adalah 1.2≤s/D≤1.4 dan Reynold number Re = 5.3 x 104 pada kecepatan U ͚=14 m/s. Simulasi numerik menggunakan variasi turbulent model k-epsilon (2eq), k-omega (2eq) dan transition k-kl-omega (3eq). Hasil dari pelitian ini diharapkan mampu menunjukan performa aerodinamika yang lebih baik, dengan membandingkan beberapa parameter ukur antara silinder tunggal dan silinder dengan pengganggu. Parameter ukur yang dianalisa adalah y3coefficient of pressure, distribution tekanan disekitar dinding silinder utama, coefficient of lift, coefficient of drag dan visualisasi kontur kecepatan dan tekanan.
INVESTIGASI NUMERIK PENGURANGAN GAYA DRAG PADA PIPA ENGINE OIL COOLER NUMERICAL INVESTIGATION OF DRAG FORCE REDUCTION ON THE ENGINE OIL COOLER TUBE Surya Cakra; Gunawan Sakti; Bambang Junipitoyo
Approach : Jurnal Teknologi Penerbangan Vol. 4 No. 2 (2020): Oktober 2020
Publisher : Politeknik Penerbangan Surabaya

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Abstract

Upaya pengurangan gaya drag pada sebuah silinder adalah penelitian yang masih populer dilaksanakan oleh banyak peneliti hingga saat ini. Pengurangan gaya drag ini sangat bermanfaat dan dan banyak digunakan seperti pada desain pipa-pipa heat exchanger, tiang pancang konstruksi bangunan lepas pantai dan pilar-pilar jembatan. Upaya penurunan gaya drag dilakukan meggunakan simulasi numerik Ansys Fluent® dengan diameter geometri silinder utama adalah D = 60 mm, diameter silinder pengganggu d = 0.5D dengan diberikan variasi jarak antar titik pusat antara kedua silinder adalah 1.2≤s/D≤1.4 dan Reynold number Re = 5.3 x 104 pada kecepatan U ͚=14 m/s. Simulasi numerik ini juga diberikan variasi turbulent model k-epsilon (2eq), k-omega (2eq) dan transition k-kl-omega (3eq) untuk mendapatkan data hasil simulasi numerik yang mendekati eksperimental. Hasil dari pelitian ini diharapkan mampu menunjukan peningkatan performa aerodinamika yang lebih baik. Adapun analisa dilakukan dengan membandingkan beberapa parameter ukur antara silinder tunggal tanpa pengganggu dan silinder dengan pengganggu. Adapun beberapa pertimbangan yang digunakan dalam analisa performa aerodinamika ini adalah Cp, distribution tekanan didinding silinder utama, Cd, Cl dan visualisasi kontur kecepatan dan tekanan.
Co-Authors Ahmad Musadek Ajeng Wulansari Ajeng Wulansari Antares Bahtera Febriartanto Bambang Junipitoyo Bambang Junipotoyo Bayu Dwi Cahyo Cholik Setijono David Kurniawan Putra Dedy Akbar Wahyudi M. Rizki Syahreza Siregar Mochamad Ilyas Alqadri Mochammad Rafihan Alrasyid Muhammad Akbar Salim Putra Abdian Rimba Sulyanto Rifdian Indrianto Sudjoko Rizaldi Firmansyah Khamid Setyo Hariyadi Setyo Haryadi Sukahir Supriadi Supriadi Surya Cakra Suseno Suseno Suyatmo Suyatmo Verdian Kurniawan Vidia Annisa Sophiana Wawan Aries Widodo Yuyun Suprapto