Design Optimization Of Balancing Hole In A Centrifugal Pump Impeller By Using Experimental Design Methods

Abstract

The aim of this study is to determine the optimal balancing hole to be drilled into the pump impeller in order to extend the bearing life by reducing the axial forces exposed on the bearings. In this study, as well as reduction of the axial forces, the changes in the pump efficiency are also considered. For this study, a single-stage centrifugal pump having a 1450 rpm speed, 350 m³/h flow rate and 51 m head is chosen. It is foreseen to optimize the design optimization of the balancing holes on the selected pump impeller is implemented by using the method of experimental design and Computational Fluid Dynamics (CFD). Ansys Fluent software is used for CFD analysis. In order to reach the optimum results, four parameters including the hole center angle, hole diameter, hole center diameter and number of balancing holes in the impeller are selected, and the optimization study is carried out by using Multi-Objective Taguchi Method. Low axial force and high pump efficiency are accepted as objectives. CFD results are evaluated according to the analysis of variance (ANOVA) and signal/noise (S/N) ratio. As a result, it is determined that the hole diameter is the most effective parameter on these objectives. The optimum design parameters are found to be 0°, 12 mm, 100 mm and 6 for the parameters given above, respectively.

Keywords

• Axial Force
• Balancing Holes
• Optimization
• Pump Efficiency
• Taguchi

Deneysel Tasarım Yöntemleri İle Bir Santrifüj Pompa Çarkında Dengeleme Deliği Tasarım Optimizasyonu

Abstract

Bu çalışmanın amacı, rulmanlara gelen eksenel kuvvetleri azaltarak rulman ömrünü uzatmak için pompa çarkına açılacak en uygun dengeleme deliğinin belirlenmesidir. Çalışmada eksenel kuvvetlerin azaltılmasının yanı sıra pompa veriminde meydana gelen değişiklikler de dikkate alınmıştır. Bu çalışma için 1480 rpm hız, 350 m³/h debi ve 51 m basma yüksekliğine sahip tek kademeli santrifüj pompa seçilmiştir. Seçilen pompa çarkı üzerindeki dengeleme deliğinin tasarım optimizasyonu, deneysel tasarım metodu ve Hesaplamalı Akışkanlar Dinamiği (HAD) kullanılarak gerçekleştirilmiştir. HAD analizleri için Ansys Fluent programı kullanılmıştır. Optimum sonuca ulaşmak amacıyla dengeleme deliklerinin çark içerisindeki; delik merkezi açısı, delik çapı, delik merkezi çapı ve adedini belirleyen 4 parametre tespit edilmiş ve Çok Amaçlı Taguchi Yöntemi kullanılarak optimizasyon çalışması gerçekleştirilmiştir. Amaçlar; düşük eksenel yük ve yüksek pompa verimi olarak kabul edilmiştir. HAD sonuçları, varyans analizi (ANOVA) ve sinyal/gürültü (S/N) oranına göre değerlendirilmiştir. Yapılan çalışmalar sonucunda; delik çapının amaçlar üzerinde en etkili parametre olduğu tespit edilmiştir. Optimum tasarımın; belirlenen dört parametre için sırasıyla 0°, 12 mm, 100 mm ve 6 adet olduğu belirlenmiştir.

Keywords

• Dengeleme Delikleri
• Eksenel Kuvvet
• Optimizasyon
• Pompa Verimi
• Taguchi

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