بررسی تجربی جت‌های مایع مستطیلی تزریق‌شده به درون ‌‌‌‌‌‌جریان گازی عرضی فروصوت

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی هوافضا، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

در این پژوهش مشخصه‌های جریان جت‌های مایع مستطیلی تزریق‌شده به جریان گازی عرضی فروصوت به صورت تجربی بررسی شده است. از چهار انژکتور با نسبت منظری‌های 1، 2، 3 و 4 برای بررسی جت‌های مستطیلی استفاده شده است. فیزیک لحظه‌ای جریان با استفاده از عکس‌برداری سرعت بالا ثبت شده و پارامترهای مختلف جریان به کمک کدهای پردازش تصویر محاسبه شده‌اند. با توجه به تصاویر آشکارسازی جریان، رژیم‌های ستونی، کمانی، کیسه‌ای و ترکیبی (کیسه‌ای و برشی) مشاهده شده‌اند. همچنین، تاثیر نسبت مومنتوم و نسبت منظری بر مشخصه‌های جت مایع مستطیلی از جمله مسیر، پهنا و تشکیل کیسه بررسی شده است. با افزایش نسبت مومنتوم، قدرت جت افزایش یافته و کمتر در جریان خم می‌شود. نسبت منظری تاثیر کمتری بر روی مسیر جت داشته است اما پهنای جت به شدت تحت تاثیر نسبت منظری می‌باشد. همچنین، نتایج به‌دست‌آمده نشان داد که علاوه بر نسبت مومنتوم، عدد وبر جت نیز تاثیر بسزایی بر روی مسیر جت و پهنای جت دارد. با افزایش عدد وبر گاز، نیروی پسای وارد بر ستون مایع افزایش یافته و در نتیجه جت بیشتر در جریان گاز خم می‌شود. بر همین اساس، مدلی ریاضی برای تخمین مسیر جت مستطیلی ارائه شد که در آن اعداد وبر جت و گاز، و همچنین ضریب منظری به عنوان متغیرهای مدل در نظر گرفته شده‌اند. با توجه به نتایج به‌دست‌آمده برای پهنای جت، مشخص شد که پدیده تغییر محور به طور مستقیم موجب افزایش پهنای جت می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Rectangular liquid jets injected transversely into subsonic crossflow

نویسندگان [English]

  • Rojin Shokri
  • Mehran Tadjfar
  • Amin Jaberi
Amirkabir University of Technology, Department of Aerospace Engineering
چکیده [English]

Rectangular liquid jets injected into gaseous crossflow were experimentally investigated. In this study, water was used as the working fluid. Four rectangular injectors with aspect ratios of 1, 2, 3 and 4 were manufactured to study the physics of jet flow. The backlight shadowgraphy technique along with high-speed photography was employed to capture the instantaneous physics of the liquid jet flow. Based on the flow visualizations, different breakup regimes including column breakup, arcade breakup, bag and multiple breakup were identified. Trajectory and width of the liquid jets were measured using an in-house image processing program. Effects of momentum ratio, aspect ratio and gas velocity on trajectory and width were investigated. The results showed that the momentum ratio was most effective on the jet trajectory while aspect ratio was of least importance. Also, a mathematical model was suggested to estimate the trajectory of liquid jets. In this model, jet Weber number, gas Weber number and aspect ratio were introduced as the variables. Furthermore, it was revealed that aspect ratio directly influenced the width of liquid jets.

کلیدواژه‌ها [English]

  • Rectangular jet
  • Trajectory
  • Liquid jet width
  • Gaseous crossflow

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نشریه مهندسی مکانیک امیرکبیر
دوره 53، شماره 5 (Special Issue)
مرداد 1400
صفحه 3117-3134

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