Numerical and Experimental Investigation of Design Parameters for Efficiency Increase of Banki Turbine

Year 2023, Volume: 12 Issue: 1, 49 - 64, 10.06.2023

Oğuzhan Bendeş , Buğra Yılmaz , Faruk Koç , Adem Yıldız

https://doi.org/10.55007/dufed.1243168

Abstract

In this study, it is aimed to create a new runner model by optimizing the number of turbine blades in order to increase the efficiency of the Banki hydraulic turbine. The design values of the turbine, whose flow and head values are known, were calculated analytically. There is no accepted analytical method in the literature for the number of blades. Numerical analysis of this runner was carried out by ANSYS CFX software by testing 7 different blade numbers and 30 bladed runner with the highest efficiency were produced from the analysis results. The numerical study of the turbine model, which was created based on 0.2 m3 flow and 65 meters head values, was verified by experimental tests. Numerical and experimental studies were repeated for 30 bladed turbines to find efficiency at different flow rates. The turbine reached a maximum efficiency of 74.91% in experimental tests and 76.85% in CFD analysis. It has been seen that these results are in agreement with the numerical and experimental test results and the maximum efficiency value is realized in a certain flow range. With the proposed numerical analysis method, the number of blades that give the highest efficiency can be determined without the need to manufacture different models.

Keywords

Design of the banki turbine, CFD analysis of the banki, Efficiency of the banki, Banki experimental tests

Banki Türbini Verimlilik Artışı için Tasarım Parametrelerinin Sayısal ve Deneysel Olarak İncelenmesi

Abstract

Bu çalışmada, Banki hidrolik türbininin verimini artırmak için türbin kanat sayısını optimize edip yeni çark modeli oluşturmak amaçlanmıştır. Debi ve düşü değerleri bilinen türbinin tasarım değerleri analitik yollarla hesaplanmıştır. Kanat sayısı için literatürde kabul gören bir analitik yol bulunmamaktadır. 7 farklı kanat sayısı denenerek bu çarkın sayısal analizi ANSYS CFX yazılımıyla gerçekleştirilmiş ve analiz sonucu değerlerinden en yüksek verime sahip olan 30 kanatlı çark imal edilmiştir. 0,2 m3 debi ve 65 metre düşü değerleri baz alınarak oluşturulan türbin modelinin sayısal çalışması deneysel testler ile doğrulanmıştır. Sayısal ve deneysel çalışmalar 30 kanatlı türbin için farklı debilerde verimi bulmak için tekrarlanmıştır. Türbin deneysel testlerde %74,91, HAD analizleri sonucunda %76,85 maksimum verim değerine ulaşmıştır. Bu sonuçlarla sayısal ve deneysel test sonuçlarının uyum içinde olduğu ve maksimum verim değerinin belli debi aralığında gerçekleştiği görülmüştür. Önerilen sayısal analiz yöntemiyle en yüksek verimi veren kanat sayısı farklı modelleri imal etmeye gerek kalmadan belirlenebilir.

Keywords

Banki türbin tasarımı, Banki CFD analizi, Banki türbin verimi, Banki deneysel testler

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