Studi Numerik Pengaruh Variasi Kelengkunngan Sudut β₂ Terhadap Performa Sentrifugal Primary Air Fan

Aznariza, Rifan (2026) Studi Numerik Pengaruh Variasi Kelengkunngan Sudut β₂ Terhadap Performa Sentrifugal Primary Air Fan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Primary Air Fan (PAF) merupakan komponen kritis pada sistem boiler pembangkit listrik tenaga uap (PLTU) yang berfungsi mengeringkan dan mengangkut batubara serta menyediakan udara awal pembakaran namun, penurunan nilai kalor batubara di PT XYZ meningkatkan kebutuhan laju alir batubara sehingga performa PAF eksisting belum mampu mengakomodasi kenaikan kebutuhan tekanan udara pembakaran. Penelitian ini bertujuan menganalisis pengaruh variasi sudut outlet blade angle (β2) impeller terhadap performa centrifugal PAF melalui simulasi numerik Computational Fluid Dynamics (CFD) menggunakan ANSYS Fluent dengan model turbulensi k-omega SST, di mana geometri impeller dan casing dimodelkan pada Solidworks dan disimulasikan pada lima variasi sudut β2 (64°, 70°, 75°, 80°, dan 85°) setelah melalui uji grid independency dan validasi terhadap data spesifikasi aktual yang menghasilkan error sebesar 3,19%. Pada kapasitas desain Q = 424.800 m³/h, hasil simulasi menunjukkan bahwa sudut β2 = 64° memberikan performa terbaik dengan tekanan total 11.630,67 Pa dan efisiensi overall tertinggi sebesar 63,58%, sementara efisiensi menurun secara konsisten seiring bertambahnya sudut β2 60,51% pada 70°, 58,25% pada 75°, 55,81% pada 80°, dan 53,39% pada 85° akibat berkembangnya separasi aliran, wake, dan vorteks di sisi suction sudu sebagaimana teramati pada kontur tekanan dan kecepatan meski demikian, pada kapasitas yang lebih tinggi 509.688 m³/h sudut β2 = 85° justru menghasilkan tekanan total tertinggi, yaitu 11.730,07 Pa. Berdasarkan temuan tersebut, disimpulkan bahwa sudut β2 = 64° direkomendasikan apabila prioritas utama adalah efisiensi, sedangkan sudut β2 = 85° lebih sesuai apabila prioritas utama adalah tekanan total maksimum, dengan saran penelitian lanjutan berupa penambahan variasi kapasitas serta validasi eksperimental langsung di lapangan.
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The Primary Air Fan (PAF) is a critical component of the boiler system in a coal-fired power plant, responsible for drying and transporting coal and supplying the initial combustion air; however, a decline in coal calorific value at PT XYZ has increased the required coal flow rate, leaving the existing PAF's pressure output unable to fully accommodate the resulting rise in combustion-air demand. This study analyzes the effect of varying the impeller outlet blade angle (β2) on centrifugal PAF performance through numerical Computational Fluid Dynamics (CFD) simulation using ANSYS Fluent with the k-omega SST turbulence model, in which the impeller and casing geometry were modeled in Solidworks and simulated across five β2 variations (64°, 70°, 75°, 80°, and 85°) following a grid independency test and validation against actual specification data, yielding an error of 3.19%. At the design capacity of Q = 424,800 m³/h, the results show that β2 = 64° delivers the best performance, with a total pressure of 11,630.67 Pa and the highest overall efficiency of 63.58%, while efficiency declines consistently as β2 increases 60.51% at 70°, 58.25% at 75°, 55.81% at 80°, and 53.39% at 85° due to growing flow separation, wake, and vortex formation on the blade suction side observed in the pressure and velocity contours; nevertheless, at a higher capacity of 509,688 m³/h, β2 = 85° instead produces the highest total pressure of 11,730.07 Pa. Based on these findings, β2 = 64° is recommended when efficiency is the top priority, whereas β2 = 85° is more suitable when maximum total pressure is the priority, with further research recommended to expand the capacity variation range and include direct experimental field validation.

Item Type:	Thesis (Other)
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ990 Compressors
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Rifan Aznariza
Date Deposited:	30 Jul 2026 00:47
Last Modified:	30 Jul 2026 00:47
URI:	http://repository.its.ac.id/id/eprint/139893

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