مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی عددی تأثیر افزودن پره‌های ثابت بر بهبود عملکرد پمپ معکوس سانتریفیوژ

نوع مقاله : پژوهشی اصیل

نویسندگان
دانشگاه علم و صنعت ایران
چکیده
با تغییر الگوی مصرف انرژی همچنین مطرح شدن مباحث اقتصادی و زیست‌محیطی، تولید انرژی تجدیدپذیر در سراسر دنیا مورد توجه زیادی قرار گرفته است. نیروگاه‌های برقابی میکرو که از پمپ معکوس به جای توربین استفاده می‌کنند مزایای منحصربه‌فردی مانند هزینه پایین ساخت و نگهداری، زمان کوتاه راه‌اندازی دارند. در مطالعه حاضر، طراحی و شبیه‌سازی پمپ معکوس گریز از مرکز با استفاده از نرم‌افزارهای سی‌اف‌توربو و سی‌اف‌ایکس انجام شده است. گسسته سازی معادلات حاکم به روش حجم محدود صورت گرفته و مدل آشفتگی کا-امگا اس‌اس‌تی برای تحلیل عددی استفاده شده است. نمودارهای عملکردی پمپ معکوس شبیه‌سازی شده تطابق قابل قبولی با نتایج تجربی دارد. از آنجایی که پمپ‌ها برای کارکرد معکوس طراحی نشده‌اند و تجهیزی برای هدایت سیال خروجی از حلزونی به پروانه ندارند، تلفات قابل توجهی به خصوص در شرایط کاری خارج از طراحی اتفاق می‌افتد. به منظور بهبود عملکرد پمپ معکوس دیفیوزرهایی با پره برای به‌کارگیری در فضای بین پروانه و حلزونی طراحی شدند و به صورت عددی تأثیر تعداد پره‌های ثابت دیفیوزر بر محدوده کاری مورد بررسی قرار گرفت. نتایج نشان می‌دهد که پمپ معکوس با دیفیوزر 10 پره توزیع انرژی جنبشی آشفتگی یکنواخت‌تری دارد و محدوده کارکرد با راندمان بالای گسترده‌تری دارد. همچنین راندمان پمپ معکوس در نقطه طراحی 2٫7 درصد افزایش یافته است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Numerical Investigation of the Effect of Adding Stay Blades on Improving the Performance of Centrifugal Pump as Turbine

نویسندگان English

Salman Saremian
Mohammad Hassan Shojaeefard
Faculty of Mechanical Engineering, Iran University of Science and Technology
چکیده English

With the changing patterns of energy consumption and the emergence of economic and environmental issues, renewable energy production has received a lot of attention all over the world. Micro-hydropower plants that utilize pumps as turbine (PAT) instead of traditional turbines offer unique advantages such as low construction and maintenance costs, and short commissioning time. In the present study, the design and simulation of a centrifugal PAT were performed using CFturbo and CFX software. The governing equations were discretized using the finite volume method, and the k-ω SST turbulence model was employed for numerical analysis. The performance curves of simulated PAT show acceptable agreement with experimental results. Since pumps are not designed for reverse operation and lack equipment to guide fluid flow from the volute to the impeller, significant losses occur, particularly under off-design operating conditions. In order to improve the PAT performance, diffusers equipped with stay blades were designed for implementation in the space between the impeller and the volute, and the effect of the number of stay blades on operating range was numerically investigated. Results indicate that the PAT equipped with a 10-blade diffuser exhibits more uniform turbulent kinetic energy distribution and provides a wider operating range with high efficiency. Besides, the PAT efficiency at the design point has increased by 2.7%.

کلیدواژه‌ها English

Pump as turbine
energy recovery
efficiency improvement
Adding Stay Blades
Computational Fluid Dynamics
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