مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

شبیه‌سازی عددی و بهینه‌سازی چند هدفی ایندیوسر پمپ گریز از مرکز

نویسندگان
محمدحسن شجاعی فرد 1
سید احسان حسینی 2
جواد زارع 3
1 رئیس دانشکه مهندسی خودرو
2 دانشکده مکانیک، دانشگاه علم و صنعت ایران
3 دکتری،دانشگاه علم و صنعت ایران
چکیده
ایندیوسرها قطعات مهمی هستند که برای دستیابی به عملکرد مکش بالاتر در بالادست پروانه اصلی پمپ گریز از مرکز نصب می‌‌گردند و با سرعت دورانی پروانه می‌‌چرخند. ایندیوسر با افزایش فشار ورودی به پمپ باعث بهبود عملکرد هیدرولیکی و طول عمر پمپ می‌گردد اما میزان بهبود شدیداً وابسته به پارامترهای هندسی ایندیوسر بوده و بنابراین بهینه‌سازی پارامترهای هندسی آن اجتناب ناپذیر می‌باشد. در پژوهش حاضر با در نظر گرفتن زاویه ورودی نوک پره، زاویه خروجی نوک پره و نسبت قطر خروجی به ورودی توپی به عنوان پارامترهای طراحی و ضریب هد، بازدهی هیدرولیکی و هد مکش مثبت خالص مورد نیاز به عنوان توابع هدف، به تعیین مقادیر بهینه جهت دست‌یابی به ماکزیمم عملکرد ایندیوسر پرداخته شده است. عملکرد ایندیوسر به‌صورت سه‌بعدی شبیه‌سازی و با نتایج تجربی مقایسه گردیده است که تطابق مناسب نتایج، نشان دهنده صحت روش و فرضیات مورد استفاده می‌باشد. شبکه عصبی مصنوعی برای استخراج رابطه مابین متغیرهای طراحی و توابع هدف مورد استفاده قرار گرفته است. در ادامه با استفاده از الگوریتم اصلاح شده ژنتیک بر مبنای مرتب سازی نقاط غیر برتر II نمودار پارتو در صفحه توابع هدف مختلف ترسیم شده و مقادیر نقاط بهینه پیشنهادی برای متغیرهای طراحی با استفاده از روش نزدیک‌ترین نقطه به نقطه ایده‌آل بدست آمده است. با توجه به بهینه‌سازی چند هدفی مقدار ضریب هد 14.3%، بازدهی هیدرولیکی 0.3% و هد مکش مثبت خالص موردنیاز 30.2% بهبود پیدا کرده است. نقاط طراحی پیشنهادی حاوی نکات قابل توجهی هستند که بدون استفاده از بهینه‌سازی چند هدفی قابل محاسبه نمی‌باشند.
کلیدواژه‌ها
ایندیوسر
پمپ گریز از مرکز
شبکه عصبی مصنوعی
بهینه‌سازی چند هدفی

موضوعات

عنوان مقاله English

Numerical simulation and multi-objective optimization of the centrifugal pump inducer

نویسندگان English

mohammad hassan shojaeefard 1
seyed ehsan hosseini 2
javad zare 3
1 Iran university of science and technology
2 Iran university of science and technology
3 School of mechanical engineering, Iran university of science and technology
چکیده English

Inducers are important devices which are mounted upstream of the inlet to the main impeller of the centrifugal pump to achieve higher suction performance and rotate with the same speed as the impeller. Inducers improve the hydraulic performance and lifespan of the pump through increasing the inlet pressure, but the quantity of the improvement is dependent on the geometrical parameters of the inducer. Therefore, the optimization of these parameters is crucial. In the present study, the performance of an inducer is optimized by considering the inlet tip blade angle, the outlet tip blade angle and the ratio of the outlet hub radius to inlet hub radius as design variables and the head coefficient, the hydraulic efficiency and the required net positive suction head as objective functions. The inducer performance is simulated using 3-D computational fluid dynamics and compared with experimental data which shows the validity of the used method and assumptions. The artificial neural network is used to relate between design variables and objective functions. Then, the Pareto fronts are plotted using the modified non-dominated sorting genetic algorithm II and the proposed optimum points are presented using nearest point to the ideal point method. Using multi objective optimization, the head coefficient, the hydraulic efficiency and the net positive suction head are improved 14.3%, 0.3% and 30.2%, respectively. Recommended design points unveil important optimal design principles that would not have been obtained without the use of a multi objective optimization approach.

کلیدواژه‌ها English

Inducer
Centrifugal pump
artificial neural network
multi-objective optimization
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مهندسی مکانیک مدرس
دوره 18، شماره 7
آبان 1397
صفحه 205-216