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Rancang Bangun Wind Tunnel Spesifikasi Kecepatan Angin Rendah Terhadap Intensitas Turbulensi Aliran Udara Ulum, Miftahul; Firmansyah, M. Adie; Riani, Novi Indah
Journal of System Engineering and Technological Innovation Vol 3 No 01 (2024): April 2024
Publisher : Faculty of Engineering, Wijaya Putra University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38156/jisti.v3i01.70

Air flow in the view of fluid mechanics phenomena is very important to study, for this reason many researchers have carried out experiments to prove that air flow has various characteristics in aerodynamics. In this research, researchers tried to create an air flow test tool, namely the Win Tunnel with low wind capacity, which is usually referred to as subsonic, as a learning medium for measuring laboratory capacity air flow. The method used in this research is experimental, where first a Subsonic Wind Tunnel design is created that can be used as a test tool, before the test tool can be used properly. In this study, the parameters used to determine the suitability of the tool were measuring the turbulence intensity value by placing positions in the test section, namely the front, middle and back of the test section location. by using variations in inverter fan rotation at frequencies of 15 Hz, 30 Hz and 45 Hz. The results of this research obtained a Mach Number value below 0.3, which proves that the Wint Tunnel made has the correct specifications, namely subsonic. From the results of positioning in the test section to obtain turbulence intensity, the results were 11.15%, 7.83%, and 12.5% at f15 Hz, 6.54%, 2%, and 2.76% at f30 Hz, while at f45 Hz the results were 2.47%, 0.87%, and 1.67%.. The best position for placing the pitot tube is in the middle of the test section

ANALISIS PERFORMA TURBIN PELTON SUDU SEGITIGA DENGAN VARIASI SUDUT SEMPROT NOSEL Riani, Novi Indah; Masykur, Masykur; Abidin, Zainal
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 8, No 1 (2022): April
Publisher : universitas teuku umar

The availability of electrical energy in Indonesia is a very important factor in encouraging development. Increased development, especially in the industrial sector in the form of factories and home industries, continues to grow rapidly. These developments include economic and population growth, so that the need for electrical energy continues to increase. The Pelton turbine is an electrical energy generator that utilizes water as a propeller or bucket on the rotating wheel of the Pelton turbine. So that, it is expected as an alternative to provide electrical energy needs, especially in the industrial sector. This study aims to determine the effect of variations in the angle of the nozzle spray on the triangular blade on the performance of the Pelton turbine. The variations of the nozzle spray angle include 30º, 45º, and 90º. Each nozzle spray angle is varied to the valve opening angle of 60º, 75º, 90º with lamp loads of 0, 5, 10, 15, 20, 25 Watt. Based on the results of this study, it is proven that the nozzle spray angle of 90º has the best results at a valve opening angle of 90º and a lamp load of 15 Watt which produces a generator power of 6.784 Watt with an efficiency of 54.04%. Keywords— Pelton turbine with triangular blade, nozzle spray angle, valve opening angle, generator power, efficiency.

Studi Eksperimental Pengaruh Variasi Jarak Gap (G/D) pada Silinder Sirkular yang Tersusun secara Tandem terhadap Karakteristik Aliran Hanafi, Muhammad Khamdan; Riani, Novi Indah; Lostari, Aini; Hartono, R. Yudi
AutoMech : Jurnal Teknik Mesin Vol 3, No 02 (2023): Nopember
Publisher : Universitas Muhammadiyah Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24269/jtm.v3i02.8053

Aliran melintasi suatu bluff body salah satunya adalah bentuk silinder silkular yang banyak dijumpai dalam aplikasi engineering. Ketika melintasi suatu susunan silinder maka aliran tersebut akan membentuk pola (pattern) tertentu hal ini berdampak terhadap karakteristik aerodinamika dari silinder didalam susunan tersebut. Saat melintasi bodi aliran akan membentuk suatu pola aliran (flow pattern) yang sesuai dengan geometri kontur bodi dan juga menimbulkan gaya – gaya aerodinamika,untuk mengetahui tekanan aliran pada silinder silkular secara tandem. Penambahan pengganggu yang diletakkan di depan silinder sirkular bertujuan untuk mempercepat aliran dari laminar ke turbulen sehingga separasi aliran bisa ditunda lebih lambat sehingga pressure drag yang dihasilkan lebih kecil Metode penelitian yang digunakan adalah eksperimental dengan menggunakan dua buah silinder sirkular disusun secara tandem berdiameter (D) 25 mm dengan variasi G/D 0, 1, 2, 3 dan dua buah bodi pengganggu berbentuk square di depan masing-masing silinder berdimensi 4 mm. Posisi sudut pengganggu konstan sebesar 30o dan jarak gap 0,4 mm. Bilangan Reynolds berdasarkan silinder yang digunakan yaitu 2,3x104. Penelitian ini bertujuan untuk mendapatkan distribusi koefisien tekanan (Cp) koefisien drag pressure (Cdp) dan velocity profile dibelakang benda uji. Hasil menunjukkan bahwa yang terbaik pada variasi G/D 2 dengan nilai 0.22137 pada silinder upstream.

The Effect of Adding a Square Disturbance on the Flow Characteristics across Circular Cylinders Arranged in Tandem Riani, Novi Indah; Lostari, Aini; Ulum, Miftahul; Hakim, Ainul
JMPM (Jurnal Material dan Proses Manufaktur) Vol 8, No 1 (2024): Juni
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v8i1.21898

Circular cylinder is one form of bluff body that is often used in engineering and industrial applications. The addition of a square placed in front of the circular cylinder aims to accelerate the flow from laminar to turbulent so that flow separation can be delayed more slowly so that the resulting pressure drag is smaller. The research method used was experimental using two circular cylinders arranged in tandem with a diameter (D) of 25 mm and variations in the distance between cylinders (L/D) 2;2,5;3;3,5;4 and two square-shaped square bodies (SDB) in front of each cylinder with dimensions of 4 mm. Position of SDB angle is 30o and the gap distance is 0.4 mm. The Reynolds number used is 2.3x104. This study aims to obtain the distribution of pressure coefficient (CP), drag pressure coefficient (CDP) and velocity profile behind the test specimen. The results showed that the addition of two square-shaped square bodies on each cylinder can reduce the drag force on the cylinder which causes a difference in values, where the largest pressure coefficient value occurs at a distance of L/D 4 with a value of -1.073 and the lowest value of drag pressure coefficient (CDP) at a distance of L/D 2 on the upstream cylinder with a value of 0.0786. While the downstream cylinder is located at a distance of L/D 3 with a value of -0.079 and the lowest speed value is located in the variation of L/D 4 with a value of 9.52 m/s.

PEMODELAN MESIN DIESEL DUAL FUEL (DDF) MENGGUNAKAN BAHAN BAKAR BIODIESEL DAN GAS HIDROGEN Winangun, Kuntang; Lostari, Aini; Riani, Novi Indah
TURBO [Tulisan Riset Berbasis Online] Vol 13, No 2 (2024): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v13i2.3750

Vehicle exhaust emissions are the second largest cause of pollution after industry. Therefore, the government is targeting net zero emissions by 2060. One way to reduce fuel consumption is to use biodiesel. However, the use of biodiesel still has many negative impacts on vehicle performance, namely decreased engine performance. One way to reduce exhaust emissions without reducing engine performance is by adding hydrogen gas. This study was conducted with a simulation to determine the phenomena that occur in the combustion chamber of a single-cylinder diesel engine including hot cylinder pressure, the impact of combustion on exhaust emissions. The stages in this study consist of pre-processing, processing and post-processing. The results of this study indicate that the addition of hydrogen gas can increase the heat in the combustion chamber, the impact of increased heat is an increase in cylinder pressure, combustion chamber temperature, NO emissions, and CO emissions. While HC and soot emissions decreased with the addition of hydrogen gas to biodiesel fuel.

The Effect of Adding a Square Disturbance on the Flow Characteristics across Circular Cylinders Arranged in Tandem Riani, Novi Indah; Lostari, Aini; Ulum, Miftahul; Hakim, Ainul
JMPM (Jurnal Material dan Proses Manufaktur) Vol. 8 No. 1 (2024): Juni
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v8i1.21898

Circular cylinder is one form of bluff body that is often used in engineering and industrial applications. The addition of a square placed in front of the circular cylinder aims to accelerate the flow from laminar to turbulent so that flow separation can be delayed more slowly so that the resulting pressure drag is smaller. The research method used was experimental using two circular cylinders arranged in tandem with a diameter (D) of 25 mm and variations in the distance between cylinders (L/D) 2;2,5;3;3,5;4 and two square-shaped square bodies (SDB) in front of each cylinder with dimensions of 4 mm. Position of SDB angle is 30o and the gap distance is 0.4 mm. The Reynolds number used is 2.3x104. This study aims to obtain the distribution of pressure coefficient (CP), drag pressure coefficient (CDP) and velocity profile behind the test specimen. The results showed that the addition of two square-shaped square bodies on each cylinder can reduce the drag force on the cylinder which causes a difference in values, where the largest pressure coefficient value occurs at a distance of L/D 4 with a value of -1.073 and the lowest value of drag pressure coefficient (CDP) at a distance of L/D 2 on the upstream cylinder with a value of 0.0786. While the downstream cylinder is located at a distance of L/D 3 with a value of -0.079 and the lowest speed value is located in the variation of L/D 4 with a value of 9.52 m/s.

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