مطالعه عددی تأثیر تغییر هندسه پروانه بر بهبود عملکرد یک پمپ معکوس گریز از مرکز

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

بکارگیری پمپ معکوس به جای توربین‌های سنتی در سامانه فشارشکن باعث کاهش هزینه‌های اولیه و زمان احداث نیروگاه می‌شود. اما تلفات قابل توجه در شرایط خارج از طراحی رخ می‌دهد زیرا پمپ برای کار در حالت معکوس ساخته نشده است. در این مطالعه طراحی و شبیه‌سازی پمپ معکوس گریز از مرکز به عنوان مهمترین بخش نیروگاه توسط نرم‌افزارهای سی - ‌اف - ‌توربو و سی - اف - ایکس انجام شده است. گسسته سازی معادلات حاکم به کمک روش حجم محدود انجام شد و با توجه به ماهیت آشفته جریان در پمپ معکوس از مدل کی امگا اس-‌اس-تی استفاده شده است. روند تغییرات نتایج حاصل از شبیه‌سازی هندسه اولیه پمپ معکوس اساساً با نتایج تجربی تطابق قابل قبولی دارد. تأثیر تغییر پارامترهای ضخامت پره، عرض ورودی پره و پره‌های جداکننده به صورت عددی در محدوده کاری پمپ معکوس مورد بررسی قرار گرفت. از آنجایی که افزایش راندمان و ظرفیت تولید نیروگاه مدنظر است، انتخاب حالت بهینه تغییرات پارامترهای هندسی پروانه بر اساس تحلیل آماری دبی انجام شده است. نتایج نشان می‌دهد که باتغییر همزمان پارامترها، محدوده کارکرد با راندمان بالا و تولید برق نسبت پروانه اصلی افزایش می‌یابد. پروانه بهینه در محدوده 0٫77 تا 1٫2 دبی نقطه طراحی عملکرد بهتری دارد و راندمان در نقطه طراحی 1٫92 درصد افزایش داشته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical study of the influence of changing impeller geometry on improving the performance of a centrifugal pump as a turbine

نویسندگان [English]

  • Salman Saremian
  • Mohammad Hasan Shojaeefard
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

The implementation of a pump as a turbine rather than traditional turbines in the soft pressure regulation system reduces the initial costs and construction time of the power plant. However, the significant losses occur under off-design conditions because the pump was not built to work in reverse mode. In this study, the design and simulation of the centrifugal pump as turbine as the most important part of the power plant have been done by CFturbo and CFX software. The discretization of governing equations was done with the help of the finite volume method, and regarding the turbulent nature of flow in the pump as turbine from k-ω SST model was used. The changing trend of the pump as turbine simulation results are basically in acceptable agreement with the experimental results. The impact of changing the parameters of blade thickness, blade inlet width, and splitter blades was numerically investigated in the operating range. Since increasing the efficiency and production capacity of the power plant is considered, the selection of the optimal mode of changes in the geometrical parameters of the impeller was investigated based on the statistical analysis of the flow rate. The results indicated that by simultaneously modifying the parameters, the operating range with high efficiency and electricity production is increased compared to the original impeller. The optimal impeller is better performing in the range of 0.77QBEP to 1.2QBEP, and efficiency at the design point has increased by 1.92%.

کلیدواژه‌ها [English]

  • Pump as Turbine
  • Blade Thickness
  • Splitter Blades
  • Blade Inlet Width
  • CFD

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 56، شماره 1
1403
صفحه 103-124

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