ارزیابی روش PIV در تعیین مقیاس‌های آشفتگی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 عضو هیئت علمی مؤسسه تحقیقات فنی و مهندسی کشاورزی

2 استاد دانشگاه کان فرانسه

چکیده

با توجه به پیچیدگی­ها و کاربردهای فراوان آشفتگی جریان، شناخت صحیح و کمّی مقیاس­های این نوع جریان در مسائل مختلف اهمیت ویژه­ای دارد.  به­منظور تعیین مقیاس­های آشفتگی، از روش­های آزمایشگاهی متفاوت می­توان بهره جست.  اما نکتة مهم در استفاده از این روش­ها، صحت و دقت آنهاست.  در این مقاله ابتدا ضمن بررسی روش مرسوم تیلور جهت تعیین مقیاس­های آشفتگی، روش تعیین ضرایب همبستگی با استفاده از تکنیک­های آزمایشگاهی نظیر سرعت سنج سیم داغ، سرعت­سنج لیزری بررسی می­شود و پس از اجرای آزمایش روی یک جریان روباز، کارایی سیستم سرعت­سنجی با تصویربرداری از ذرات در تعیین مقیاس­های آشفتگی بررسی خواهد شد.  نتایج این تحقیق نشان ­می­دهد که روش ضرایب همبستگی و به­خصوص استفاده از سیستم سرعت­سنجی با تصویربرداری از ذرات، به رغم محدودیت­های آن در فرکانس تصویربرداری و تفکیک پذیری دوربین و پالس­های لیزر، می­تواند دسترسی به مقیاس­های آشفتگی در شرایط پیچیده را هموار سازد.

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