مطالعه‌ی عددی تأثیر پارامترهای هندسی بر عملکرد اجکتور جامد - مایع

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران

2 دانشکده مهندسی مکانیک، دانشگاه صنعتی اصفهان، اصفهان، ایران

چکیده

در این پژوهش، تأثیر پارامتر‌های هندسی بر عملکرد اجکتورهای دوفازی جامد - مایع با روش عددی مطالعه شده است. معادلات حاکم بر جریان درون اجکتور شامل پیوستگی و اندازه حرکت، از دیدگاه اویلری به روش حجم کنترل حل شده است. پارامتر‌های هندسی مورد مطالعه شامل زاویه همگرایی، زاویه واگرایی، نسبت مساحت نازل به گلوگاه و موقعیت نازل (فاصله خروجی نازل تا ابتدای گلوگاه) اجکتور می‌باشند. در این مطالعه، پارامتر‌های طراحی مهم شامل نرخ مکش، فشار بحرانی و بازده اجکتور معرفی و برای تمامی پارامتر‌های هندسی محاسبه شده‌اند. برای شبیه‌سازی جریان ثانویه از دو مدل همگن و مخلوط دوفازی استفاده شده و نتایج نشان‌دهنده آن است که در کسر حجمی‌های پایین (5%)، داده‌های حاصل از هر دو مدل تطابق خوبی باهم داشته، به‌طوری‌که بیشترین خطا در نسبت مساحت0/26 ایجاد شده و مقدار 2/3% می‌باشد. نتایج نشان دهنده آن است که بازده اجکتور با افزایش زاویه همگرایی تا 20 درجه، افزایش یافته و بعد از آن بازده اجکتور کاهش می‌یابد. همچنین افزایش نسبت مساحت تا 0/22 باعث افزایش بازده اجکتور می‌گردد و بعد از آن بازده اجکتور کاهش می‌یابد. کاهش زاویه واگرایی و افزایش فاصله نازل تا گلوگاه موجب افزایش بازده اجکتور می‌گردد. علاوه بر اینها با تغییر پارامترهای هندسی مقدار بهینه‌ای برای هریک از معیارهای طراحی به‌دست‌آمده و با توجه به کاربرد اجکتور می‌توان از آن مقادیر استفاده کرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Study of the Effect of Geometric Parameters on the Performance of Solid-Liquid Ejectors

نویسندگان [English]

  • Mostafa Hamzavi Loueh 1
  • Ramin Kouhikamali 2
1 Faculty of Mechanical Engineering, Guilan University, Rasht, Iran
2 Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran
چکیده [English]

The present research numerically studies the effect of geometric parameters on the performance of two-phase solid-liquid ejectors. The equations governing the flow inside the ejector include continuity and momentum equations from an Eulerian perspective using the control volume method. The geometric parameters under study were the convergence angle, divergence angle, area ratio (nozzle to the throat), and nozzle position (distance between the nozzle outlet and the start of the throat) in the ejector. In this study, significant design parameters, including the entrainment ratio, critical pressure, and ejector efficiency were introduced and calculated for all the geometric parameters. The homogeneous and the two-phase mixture models were employed to simulate the secondary flow. The results indicate that the data from the two models were in good agreement at low volume fractions (5%), such that the largest error occurred at an area ratio of 0.26 and was equal to 2.3%. The results also indicate that the ejector efficiency increases with an increase in the convergence angle up to 20°, after which it decreases. Moreover, an increase in the area ratio up to 0.22 improves the efficiency of the ejector, after which this efficiency is reduced. Decreasing the divergence angle and increasing the nozzle-to-throat distance also enhance the ejector efficiency. In addition, optimal values were obtained for the design parameters by varying the geometric parameters. These values can be employed according to the application for which the ejector is being used.

کلیدواژه‌ها [English]

  • Numerical simulation
  • Solid-liquid flow
  • Ejector performance
  • Geometric parameters

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 55، شماره 1
فروردین 1402
صفحه 105-122

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