بررسی اثر انحرافات هندسی بر عملکرد یک کمپرسور جریان شعاعی به کمک محاسبه ‌عدم‌قطعیت و آنالیزحساسیت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی مکانیک و انرژی، دانشگاه شهید بهشتی، تهران، ایران

2 استادیار، دانشکده مهندسی مکانیک و انرژی، دانشگاه شهید بهشتی، تهران، ایران

3 استادیار، دانشکده مهندسی مکانیک، دانشگاه زنجان، زنجان، ایران

چکیده

عملکرد پروانه شعاعی یک کمپرسور گریز از مرکز شدیدا تحت تأثیر عدم قطعیت‌های هندسی آن است. مشخصه‌های هندسی پروانه ممکن است در طول فرایند تولید یا بر اثر کارکرد بلندمدت، دچار تغییرات اندکی شود و در نتیجه منحنی‌های عملکردی کمپرسور را دچار انحراف نسبت به شرایط طراحی نماید. در این پژوهش، با استفاده از آنالیز حساسیت کلی، میزان حساسیت عملکرد نسبت به برخی مشخصه­ های هندسی تعیین می­شود و به کمک محاسبات ‌عدم‌قطعیت به روش بازخورد‌ ‌سطح کریگینگ، بازه انحراف عملکرد استخراج می­گردد. بدین منظور در ابتدا، سه دسته بانک‌‌اطلاعاتی با تعداد پروانه‌های متفاوت، با مشخصات هندسی منحرف از نمونه‌اصلی ایجاد شده‌است. برای هندسه ­های مختلف، شبیه ­سازی جریان در پروانه، به صورت سه­بعدی و با استفاده از دینامیک سیالات محاسباتی انجام‌شده­است. یک مدل جایگزین با استفاده از روش کریگینگ برای هر بانک‌داده، طراحی شده تا بتوان ‌عدم‌قطعیت را با هزینه محاسباتی کمتری پیش­بینی نمود. نتایج نشان می­دهد که در 5,95 درصد مواقع، نسبت‌فشار و بازدهی کل به کل و بازدهی کل به استاتیک، به ترتیب به اندازه 88,1، 03,1 و 56,1 درصد حول مقدار پیش‌بینی‌شده نوسان خواهند‌ داشت و شعاع خروجی، حساس‌ترین پارامتر هندسی در پروانه مورد بررسی می‌باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of the Effect of the Geometric Deviations on the Performance of a Radial Flow Compressor Employing Uncertainty Quantification (UQ) and Sensitivity Analysis

نویسندگان [English]

  • Davood Altafi 1
  • Mohammad Mojaddam 2
  • Behnam Ghadimi 3
1 M.Sc. student, Faculty of Mechanical & Energy Engineering, Shahid Beheshti University, Tehran, Iran
2 Assistant Professor, Faculty of Mechanical & Energy Engineering, Shahid Beheshti University, Tehran, Iran
3 Assistant Professor, Faculty of Mechanical Engineering, Zanjan University, Zanjan, Iran
چکیده [English]

The performance of the impeller of a radial flow compressor is highly affected by its geometric uncertainties. The geometrical characteristics of the impeller may change slightly during the manufacturing process or as a result of long-term operation, resulting in deviations from design performance curves. In this research, the performance sensitivity to each geometric parameter is determined using global sensitivity analysis, and the performance deviation interval is extracted using uncertainty quantification by the Kriging surface response method. For this purpose, initially, three categories of databases with a different number of impellers are created using geometric characteristics deviating from the original sample. For different geometries, the flow simulation in the impeller is performed using computational fluid dynamics in a viscous three-dimensional turbulent solver. A surrogate model which uses the Kriging method for each database to quantify the uncertainty more quickly is utilized. The results show that in 95.5% of cases, the pressure ratio and total to total efficiency and total to static efficiency fluctuate by 1.88%, 1.03%, and 1.56% around the predicted value, respectively. Moreover, the impeller's outlet radius is the most sensitive geometric parameter. 

کلیدواژه‌ها [English]

  • Radial Flow Compressor
  • impeller
  • Uncertainty
  • Sensitivity analysis
  • numerical simulation
  • Kriging method

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تحقیقات موتور
دوره 67، شماره 67
تیر 1401
صفحه 51-63

فایل ها

سابقه مقاله

  • تاریخ دریافت: 15 بهمن 1400
  • تاریخ بازنگری: 29 اردیبهشت 1401
  • تاریخ پذیرش: 29 اردیبهشت 1401

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