Studi Numerik Dan Eksperiment Pengaruh VNT Terhadap Daya Yang Dihasilkan Oleh Turbin Pada Turbocharger Jenis VNT Dengan Variasi Putaran Engine

Norita, Erina Yuni (2025) Studi Numerik Dan Eksperiment Pengaruh VNT Terhadap Daya Yang Dihasilkan Oleh Turbin Pada Turbocharger Jenis VNT Dengan Variasi Putaran Engine. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan turbocharger pada kendaraan bermotor menjadi salah satu solusi untuk meningkatkan efisiensi pembakaran dan performa mesin dengan memanfaatkan energi dari gas buang. Namun, teknologi turbocharger konvensional memiliki kelemahan berupa turbo lag, yaitu keterlambatan respon tenaga pada putaran rendah. Untuk mengatasi hal tersebut, dikembangkan Variable Nozzle Turbocharger (VNT) yang mampu menyesuaikan sudut bukaan nozzle sesuai dengan putaran mesin. Penelitian ini bertujuan untuk mengetahui pengaruh sudut bukaan VNT terhadap daya turbin pada turbocharger jenis VNT melalui pendekatan eksperimental dan simulasi numerik berbasis Computational Fluid Dynamics (CFD). Penelitian dilakukan dengan variasi putaran mesin sebesar 1054, 1493, 1993, dan 2508 rpm. Hasil pengujian menunjukkan bahwa peningkatan putaran mesin secara signifikan meningkatkan laju aliran massa, daya turbin, dan torsi. Validasi antara data eksperimen dan simulasi menunjukkan tingkat akurasi yang tinggi, dengan rata-rata error kurang dari 5% untuk daya dan torsi turbin. Selain itu, hasil visualisasi berupa pathline tekanan, kecepatan, dan temperatur menunjukkan bahwa karakteristik aliran fluida di dalam turbin berubah sesuai dengan kondisi operasional mesin. Penggunaan VNT secara signifikan mampu mengoptimalkan kinerja turbocharger, baik dari sisi performa mekanis maupun efisiensi termal, serta cocok diterapkan untuk sistem mesin dengan variasi putaran tinggi maupun rendah.
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The use of turbochargers in motor vehicles is one of the solutions to improve combustion efficiency and engine performance by utilizing exhaust gas energy. However, conventional turbocharger technology has a drawback known as turbo lag, which causes delayed power response at low engine speeds. To overcome this issue, the Variable Nozzle Turbocharger (VNT) was developed, allowing adjustment of the nozzle vane angle according to engine speed. This study aims to investigate the effect of VNT vane angles on turbine power output in a VNT-type turbocharger through experimental testing and numerical simulation using Computational Fluid Dynamics (CFD). The research was conducted using four engine speed variations: 1054, 1493, 1993, and 2508 rpm. The results show that increasing engine speed significantly enhances mass flow rate, turbine power, and torque. Validation between experimental and simulation data demonstrates high accuracy, with an average error of less than 5% for both power and torque. Furthermore, flow visualizations in the form of pressure, velocity, and temperature pathlines indicate that the fluid flow characteristics within the turbine vary in response to different operating conditions. VNT technology effectively optimizes turbocharger performance, both mechanically and thermally, and is well-suited for applications requiring engine operation across a wide range of speeds.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Turbocharger, Variable Nozzle Turbocharger (VNT), Computational Fluid Dynamics (CFD), Daya Turbin, Simulasi Numerik. ============================================================ Turbocharger, Variable Nozzle Turbocharger (VNT), Computational Fluid Dynamics (CFD), Turbine Power, Numerical Simulation.
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ265.E23 Thermodynamics. T Technology > TJ Mechanical engineering and machinery > TJ778 Gas turbines
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Erina Yuni Norita
Date Deposited:	30 Jul 2025 03:20
Last Modified:	30 Jul 2025 03:20
URI:	http://repository.its.ac.id/id/eprint/123114

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