تأثیر زاویه ی نصب پره‌های ثابت بر محدوده ی کارکرد با راندمان بالای پمپ معکوس سانتریفیوژ

نوع مقاله : مقاله پژوهشی

نویسندگان

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

چکیده

با توجه به محدودیت منابع فسیلی و چالش‌های زیست‌محیطی نیروگاه‌های سنتی، توسعه‌ی فناوری‌های انرژی تجدیدپذیر در راستای تأمین نیازهای جهانی، توجه گسترده‌ای را به خود معطوف کرده است. استفاده از پمپ معکوس برای بازیابی انرژی در نیروگاه‌های برقابی کوچک احداث‌شده در شبکه‌ی توزیع و انتقال آب در سال‌های اخیر فراگیر شده است. در مطالعه‌ی حاضر، عملکرد یک پمپ معکوس سانتریفیوژ به‌صورت‌های عددی و تجربی در محدوده‌ی کاری بررسی شده است. پمپ معکوس تجهیزی برای کنترل جریان ورودی به پروانه ندارد و کاهش قابل‌توجهی در راندمان در شرایط خارج از طراحی اتفاق می‌افتد. برای بهبود کارایی پمپ معکوس، یک دیفیوزر با پره طراحی و تأثیر زاویه‌ی پره‌های ثابت در عملکرد توربینی به‌صورت عددی تحلیل شده است. توزیع انرژی جنبشی آشفتگی در دیفیوزری، که پره‌های ثابت با زاویه‌ی 25 درجه دارد، یکنواخت‌تر بوده و راندمان در نقطه‌ی عملکردی، 63/2٪ افزایش یافته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect of Fixed Blades Installation Angle on the High-Efficiency Operating Range of a Centrifugal Pump asTurbine

نویسندگان [English]

  • Mohammad Hassan Shojaeefard
  • Salman Saremian
Faculty of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.
چکیده [English]

Using the pump as turbine (PAT) for energy recovery has received considerable attention in recent years as an efficient and economical approach. This study investigates the performance of a centrifugal PAT both numerically and experimentally within its operational range. For numerical analysis, design and simulation processes were conducted using CFturbo and CFX software. The validity of numerical simulations was confirmed by comparing them with experimental results. Due to the absence of a flow control mechanism at the impeller inlet, a significant reduction in efficiency is observed compared to pumping mode, particularly under off-design conditions. To enhance PAT performance, a diffuser with fixed blades was designed, and the impact of its blade angles on performance was numerically analyzed by varying angles between 15° and 35°. Turbulent kinetic energy parameter was employed to evaluate performance at different fixed blade angles. Results indicate that the blades' installation angle substantially affects both the distribution and the magnitude turbulent kinetic energy. Higher turbulence intensity was primarily concentrated in the impeller and volute tongue. Comparison of turbulent kinetic energy contours indicates that for a PAT with fixed blades at 25°, the distribution is more uniform, resulting in an efficiency improvement of 2.63% at the design point.

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