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تأثیر ارتفاع رمپ بر مشخصات مخلوط سوخت و هوا در حوزه جریان پاشش متقاطع دوتایی در جریان هوای عبوری مافوق صوت | ||
| مکانیک هوافضا | ||
| مقاله 3، دوره 18، شماره 3 - شماره پیاپی 69، مهر 1401، صفحه 27-40 اصل مقاله (1.73 M) | ||
| نوع مقاله: گرایش پیشرانش و انتقال حرارت | ||
| نویسندگان | ||
| مصطفی زاهدزاده1؛ فتح اله امی* 2 | ||
| 1دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران | ||
| 2نویسنده مسئول: استاد، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران | ||
| تاریخ دریافت: 10 خرداد 1401، تاریخ بازنگری: 06 تیر 1401، تاریخ پذیرش: 24 مرداد 1401 | ||
| چکیده | ||
| جهت بهبود آمیختگی سوخت و هوا در جریان‌های مافوق صوت از روش‌های مختلفی استفاده می‌شود که از جمله می‌توان به تعبیه یک رمپ در بالادست مجرای پاشش اشاره نمود. در کار حاضر تأثیر ارتفاع رمپ بر حوزه جریان پاشش متقاطع دوتایی جت هیدروژن در جریان هوای عبوری مافوق صوت به صورت عددی بررسی شده است و تأثیر ارتفاع رمپ بر پارامترهایی از قبیل راندمان آمیختگی، نسبت آمیختگی مؤثر و تلفات فشار سکون بررسی شده است. شبیه‌سازی‌های عددی با استفاده از حل معادلات سه-بعدی ناویر-استوکس رینولدز-متوسط همراه با مدل آشفتگی دو-معادله‌ای k-ω sst صورت پذیرفته‌اند. در ابتدا صحّه‌گذاری نتایج حل عددی با دادههای تجربی صورت پذیرفته است که مقایسه نتایج حل عددی با دادههای تجربی نشان دهنده تطابق خوب آنها با یکدیگر می‌باشد. سپس تأثیر حضور رمپ در بالادست مجرای پاشش برای چند رمپ با ارتفاع‌های مختلف به صورت عددی بررسی شده است. از نتایج بدست آمده مشاهده می‌شود که با افزایش ارتفاع رمپ از صفر تا 6 میلیمتر، راندمان آمیختگی در صفحه خروجی از 37/0 تا 52/0 و نسبت مساحت آمیختگی مؤثر در صفحه خروجی از 059/0 تا 1/0 افزایش می‌یابد. همچنین تلفات فشار سکون نیز از 8 درصد به 9 درصد افزایش می‌یابد. | ||
| کلیدواژه‌ها | ||
| اسکرمجت؛ رمپ؛ جریان مافوق صوت؛ پاشش متقاطع؛ راندمان آمیختگی؛ تلفات فشار سکون | ||
| عنوان مقاله [English] | ||
| Effect of Ramp Height on Fuel-Air Mixing Characteristics for Dual Transverse Injection behind the Ramp in Supersonic Air Crossflow | ||
| نویسندگان [English] | ||
| Mostafa Zahedzadeh1؛ Fathollah Ommi2 | ||
| 1Ph.D. Student, Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran | ||
| 2Corresponding author: Professor, Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran | ||
| چکیده [English] | ||
| To improve the mixing of fuel and air in supersonic flows, various methods are used, including the implementation of a ramp ahead of the injection port. In the present work, the effect of ramp height on the area of double hydrogen jet cross-jet flow in supersonic airflow has been investigated numerically and the effect of ramp height on parameters such as mixing efficiency, effective mixing area ratio and stagnation pressure losses has been investigated. Numerical simulations have been performed using the solution of the three-dimensional Reynolds-Averaged Navier-Stokes equations with the two-equation sst k-ω turbulent model. Initially, the results of the numerical solution are validated with the experimental data. It was shown that the numerical solution results have good agreement with experimental data. Then, the effect of the presence of a ramp upstream of the injection port is numerically investigated for several ramps with different heights. The results show that by increasing the height of the ramp from zero to 6 mm, the mixing efficiency at the exit plane increases from 0.37 to 0.52 and the effective mixing area ratio at the exit plane increases from 0.059 to 0.1. Stagnation pressure losses also increase from 8% to 9%. | ||
| کلیدواژه‌ها [English] | ||
| Scramjet, Ramp, Supersonic flow, Transverse injection, Mixing efficiency, Stagnation pressure loss | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 158 تعداد دریافت فایل اصل مقاله: 140 |
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