STUDI PENGARUH KECEPATAN PUTAR IMPELLER  TERHADAP PERFORMANCE MODEL WATERJET PROPULSOR

Erikson Leonard Tahalele; Cevin Antonio Kesaulia; Muhamad Gunawan Firmansyah

doi:10.30598/metiks.2024.4.1.108-118

Erikson Leonard Tahalele Universitas Pattimura
Cevin Antonio Kesaulia Universitas Pattimura
Muhamad Gunawan Firmansyah Universitas Pattimura

DOI: https://doi.org/10.30598/metiks.2024.4.1.108-118

Keywords: Waterjet propupulsi, variasi putaran, kecepatan, koefesien thrust, koefesien torsi

Abstract

Abstrak. Kecepatan putaran impeller sangat mempengaruhi kinerja pompa waterjet. Berbagai penelitian telah meneliti dampak terhadap efisiensi energi untuk menyelaraskan desain dengan hasil nyata. Penelitian ini menguji kecepatan putaran 2500 – 3500 rpm pada pompa aksial berdiameter 120mm dengan lima sudu impeller dan stator. Pengujian dilakukan secara eksperimental untuk mengukur kecepatan aliran rata-rata dan menggunakan pendekatan aliran turbulen pangla 1/7 muntuk menggambarkan profil kecepatan pada penampang meridian. Hasil penelitian menunjukkan bahwa profil kecepatan dan pola aliran masuk di depan impeller dan nozzle berubah seiring dengan perubahan kecepatan impeller. Kecepatan aliran meningkat di tengah pada spanwise penampang aliran. Profil aliran dipengaruhi oleh bentuk penampang, dinding saluran dan poros. Nilai koefisien torsi (Kq) dan koefisien dorong (Kt) mengalami penurunan sebesar -35,8% – 8,7% sebanding dengan peningkatan putaran. Perubahan kecepatan impeler mengubah profil kecepatan, dengan penurunan torsi dan koefisien dorong secara proporsional. Menentukan putaran optimal pada 750 - 2750 rpm masih belum dapat ditentukan karena torsi dan daya dorong terus meningkat. Pada kecepatan yang lebih tinggi, koefisien menunjukkan perubahan minimal, yang menunjukkan efek ambang batas. Nilai torsi dan thrust meningkat proporsional hampir membentuk hubungan linear dengan putaran, sedangkan koefesien torsi dan koefesien thrust menurun proporsional hampir membentuk fungsi polynomial orde 5.

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