علل عملکرد متفاوت مدل‌های آشفتگی در شبیه سازی جریان خروجی از قطره‌چکان‌ها

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه آب و خاک دانشگاه صنعتی شاهرود

2 استادیار گروه آب و خاک، دانشکده کشاورزی، دانشگاه شاهرود

3 استادیار گروه مهندسی آب/ دانشگاه شاهرود

چکیده

قطره­چکان وسیله­ای برای کاهش فشار و خروج آب با مقدار ثابت از درون مجاری باریک و طولانی مسیر (که آب تحت فشار درون آن­ها جاری است) می­باشد. از این رو مهمترین بخش سیستم آبیاری قطره­ای محسوب می­شود. از طرفی دیگر، تولید قطره­چکان مناسب زمان­بر و پرهزینه می­باشد. استفاده از دینامیک سیالات محاسباتی (CFD) می­تواند ابزار مفیدی برای کاهش هزینه و زمان ساخت قطره­چکان­ها محسوب گردد. با این هدف، در مطالعه حاضر سه نوع قطره­چکان با هندسه مجاری متفاوت انتخاب و ابعاد مجاری آن با استفاده از میکروسکوپ الکترونی(SEM) اندازه­گیری گردید. میزان دبی خروجی قطره­چکان­ها با استفاده از مدل جریان آرام و 4 مدل آشفتگی (k- ε استاندارد، k-ω استاندارد، K-ε  RNG و Realizable K-ε) شبیه­سازی شد و با نتایج حاصل از آزمایشگاه مقایسه گردید. نتایج نشان داد که به طور کلی تطابق خوبی بین نتایج آزمایشگاهی و نتایج حاصل از مدل­های مختلف آشفتگی و آرام وجود دارد، اما در بین مدل­های مورد بررسی، k-ω استاندارد و k-ε استاندارد به ترتیب بهترین و بدترین نتایج را در مقایسه با نتایج آزمایشگاهی ارائه نمودند به طوری که میانگین NRMSE سه قطره­چکان، برای دو مدل k- ε استاندارد و k-ω استاندارد، به ترتیب 57/7 و 56/3 درصد تعیین گردید. همچنین با توجه به پایین بودن اعداد رینولدز، مدل آرام نیز نتایج خوبی ارائه داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Causes of Different Performance of turbulent Models in Simulation of drip emitters outflow

نویسندگان [English]

  • Mahdi Delghandi 1
  • seyyed Hossein Hosseini 2
  • Zahra Ganji Noroozi 3
1 Shahrood University of Technology
2 Department of Water and Soil, Faculty of Agriculture, Shahrood University of technology, Shahrood, Iran.
3 Department of Water and Soil, Faculty of Agriculture, Shahrood University of technology, Shahrood, Iran.
چکیده [English]

The emitter is a device used to dissipate pressure and to discharge water at a constant rate when pressurized water flows through its narrow and long path channels, hence emitter is the key component of the drip irrigation system. On the other hand, production of a suitable emitter is expensive and time–consuming. The use of computational fluid dynamics (CFD) can be a useful tool for reducing the time and cost of manufacturing of drip emitters. For this purpose, in present study three different types of drip emitters (with different channel geometry) were chosen and their structural parameters are determined using SEM. Rate of discharge of emitters were simulated by 4 turbulence models (standard k- ε ، RNG K-ε، K-ε Realizable، standard k-ω) and Laminar model compared with experimental discharge. Results showed that on the whole there was generally good agreement between the experimental results and those obtained by different turbulent and laminar models. But among the studied models, results of standard k- ω and standard k- ε had the best and the worst agreement with experimental results, respectively. So that, the mean NRMSE of three emitters for standard k-ε and standard k-ω models was determined 7.57 and 3.56 percent, respectively. As well as with regards to low Reynolds number, the laminar model also presented good results.

کلیدواژه‌ها [English]

  • Computational Hydraulic. Emitter
  • model
  • Turbulent
  • laminar
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