نشریه مهندسی مکانیک ایران

نشریه مهندسی مکانیک ایران

بررسی تجربی طیف فرکانسی ریزش گردابه ‌ها از جسم لبه پهن دوتایی به ‌صورت سری با مقطع نیم دایره ‌ای

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
1 دانشجوی دکتری، پژوهشکده مهندسی مکانیک، سازمان پژوهش‌های علمی و صنعتی ایران، تهران
2 دانشیار، پژوهشکده مهندسی مکانیک، سازمان پژوهش‌های علمی و صنعتی ایران، تهران
3 استاد، پژوهشکده مهندسی مکانیک، سازمان پژوهش‌های علمی و صنعتی ایران، تهران
چکیده
 استفاده از جسم لبه پهن دوتایی، راهکاری برای بهبود دقت دبی ‌سنج گردابه ‌ای می‌ باشد. در این تحقیق تجربی، با استفاده از تونل باد و جریان ‌سنج سیم ‌داغ ریزش گردابه‌ های ناشی از مدل دوتایی با سطح مقطع نیم‌ دایره که به صورت سری نصب شده‌ اند در نسبت ‌های مختلف  (  قطر و  شکاف بین دو استوانه نیم‌ دایره ‌ای) اندازه ‌گیری و بررسی شده است. نتایج نشان می‌ دهد، با افزایش ، عدد استروهال کاهش می ‌یابد. همچنین با بررسی میزان انحراف از معیار تکرار پذیری خوانش عدد استروهال و منحنی نرمال گاوس، استفاده از مدل دوتایی با مقطع نیم‌ دایره برای نسبت ‌های  و  جهت استفاده در دبی‌ سنج‌ های گردابه ‌ای مناسب بوده و دقت اندازه‌ گیری آن با سطح اطمینان 95% کمتر از 8/1% است.
کلیدواژه‌ها

موضوعات


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  • تاریخ دریافت 11 آذر 1403
  • تاریخ بازنگری 16 دی 1403
  • تاریخ پذیرش 12 اسفند 1403