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Moharreri M, Ajam H. Numerical Study of Effects of Simultaneous Changes of Geometric Parameters on the Performance of Touss Power Plant Ejector and Selecting Optimal Conditions Using Taguchi Method. Modares Mechanical Engineering 2019; 19 (3) :621-629
URL: http://mme.modares.ac.ir/article-15-21758-en.html
Numerical Study of Effects of Simultaneous Changes of Geometric Parameters on the Performance of Touss Power Plant Ejector and Selecting Optimal Conditions Using Taguchi Method
M.R. Moharreri1 , H. Ajam * 2
1- Mechanical Engineering Department, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran
2- Mechanical Engineering Department, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran , h.ajam@um.ac.ir
Abstract:   (3490 Views)

Ejectors are as widely used as in food industries to refrigeration cycles and power plants. Since condensers of steam power plants are operated in vacuum conditions, there is a continuous air leakage, which results in metal corrosion and reduction in efficiency. Therefore, ejectors are used in these systems to remove the air. Over time, leakage increases, which requires more efficiency of ejector. Entrainment ratio (ER) is defined as the main criterion for ejector efficiency and leads to better performance if increased and also depends considerably on geometry of ejector. The aim of this research is to increase efficiency of ejector of Touss Power Plant by simultaneously changing nozzle exit position (NXP) and converging angle of mixing chamber. The main geometry of ejector was simulated by FLUENT and primary results were validated with experimental and computational data. Then, different geometries with simultaneous change in NXP and converging angle of mixing chamber were selected in the first step of Taguchi method and simulated by FLUENT. Geometries of the second step of Taguchi method were selected and designed based on the results of signal-to-noise ratio for the above-mentioned parameters and the values of entrainment ratio in the first step. An identical approach was followed for the third step. Final results showed 34% increase in entrainment ratio and also revealed that there is an optimum value for NXP and converging angle of the mixing chamber around which the value of entrainment ratio is maximum.
 

Keywords: ejector entrainment ratio compressible flow Taguchi
Full-Text [PDF 919 kb]   (3087 Downloads)    
Article Type: Original Research | Subject: Computational Fluid Dynamic (CFD)
Received: 2018/06/5 | Accepted: 2018/11/10 | Published: 2019/03/1
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