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All Journal R.E.M (Rekyasa Energi Manufaktur) Jurnal JURNAL CRANKSHAFT Infotekmesin
Indah Riani, Novi
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Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Aerodinamika pada Airfoil NACA 2412 terhadap Gaya Angkat dan Gaya Hambat Indah Riani, Novi; Hartono, R Yudi; Supardi, Supardi; Sugiono, Didik; Mehdiansyah, Mehdiansyah
JURNAL CRANKSHAFT Vol 7, No 4 (2024): Jurnal Crankshaft Vol.7 No.4 (2024)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v7i4.13829

Abstract

Airfoil merupakan bentuk dari sayap pesawat yang bertujuan agar mendapatka gaya angkat yang besar dan gaya hambat yang kecil. Pada penelitian ini menggunakan airfoil tipe NACA 2412 dengan wind tunnel tipe subsonic. Penelitian ini bertujuan untuk mengetahui gaya angkat dan gaya hambat setiap variasi dari airfoil yakni airfoil dengan panjang chord 12 cm, 14 cm dan 16 cm berdasarkan nilai koefisien tekanan dari setiap variasi airfoil. Penelitian ini menghasilkan nilai gaya angkat terbesar yang terdapat pada airfoil dengan panjang chord 16 cm dan sudut serang α20°, sedangkan untuk gaya hambat terkecil terdapat pada airfoil 12 cm dengan sudut serang α16°. Nilai koefisien tekanan kontur pada bagian bawah airfoil lebih besar dibandingkan dengan koefisien tekanan pada bagian atas airfoil disemua variasi dan sudut serang yang dipakai. Penurunan koefisien terbesar terjadi pada variasi chord 16 cm dengan sudut serang α20°.Kata kunci:  airfoil, gaya angkat, gaya hambat, chord.
The Effect of Pipe Diameter and Valve Opening Variations on Osborne Reynolds Apparatus Test : Pengaruh Variasi Diameter Pipa dan Bukaan Katup pada Alat Uji Osborne Reynolds Apparatus Indah Riani, Novi; Aini Lostari; Moh. Agus Wahyudi
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 8 No 1 (2023): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v8i1.1668

Abstract

The Reynolds number is a dimensionless number which is obtained from the ratio of the density, flow velocity and cross-sectional area of ​​the fluid that passes through it. The Reynolds number is also a number used to determine flow characteristics in the form of laminar, transitional and turbulent flow. This research was conducted at the Basic Phenomenon Laboratory of Mechanical Engineering Study Program, Qomaruddin University using the Osborne Reynolds Apparatus test equipment by observing dyes flowing in a flowing fluid stream (water) so as to obtain the flow visualization. The pipe test section variations include 6 mm, 8 mm and 10 mm as well as variations in valve openings from 30°, 42°, 54°, 66°, 78° to 90°. Based on the research results, the lowest flow rate, flow velocity and Reynolds number were obtained for a 6 mm pipe for a 15o valve opening with respective values ​​of 3.71 x 10-6 m3/s, 0.131 m/s, 958.87 and flow visualization shown is laminar flow. While the highest value was obtained for a 10 mm pipe with a 90o valve opening, each value was 1.287 x 10-4 m3/s, 1.639 m/s, 19957.04, and the flow visualization shown was turbulent flow.
Studi Eksperimental Pengaruh Variasi CDI Terhadap Performa Kendaraan Empat Langkah Sugiono, Didik; Lostari , Aini; Indah Riani, Novi; Kusdyanto, Aries
Infotekmesin Vol 14 No 1 (2023): Infotekmesin: Januari, 2023
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v14i1.1656

Abstract

The ignition system is a system that greatly affects the performance of a vehicle. Capacity Discharge Ignition (CDI) is a component in the ignition system that works to set the right ignition timing, therefore combustion can be maximized. This study aimed to compare the use of a factory CDI with a CDI from another vehicle, namely the 110 cc Shogun, to determine the performance of a 125 cc GL Max motorbike including torque, power, and fuel consumption to efficiency. The data collection was carried out at speeds of 25 km/hour to 65 km/hour for each gear with an increase of 10 km/hour. The results showed that the larger the gear or teeth, the value of torque, power, and efficiency will also increase. The best results were obtained in the 110 cc Shogun CDI variation with respective values of 7.96 Nm, 6.8 pk, and 81.14%. Meanwhile, the value of the most economical fuel consumption is still the standard CDI GL Max 125 cc with a value of 0.12 kg/pk.hour in the highest gear.
Co-Authors Aini Lostari Hartono, R Yudi Kusdyanto, Aries Lostari , Aini Mehdiansyah, Mehdiansyah Moh. Agus Wahyudi Sugiono, Didik Supardi Supardi