آنالیز انتقال حرارت جابجایی متان در فشار فوق‌بحرانی در یک کانال خنک‌کاری بازیابی

ابراهیمی, عباس; شکری, مریم

آنالیز انتقال حرارت جابجایی متان در فشار فوق‌بحرانی در یک کانال خنک‌کاری بازیابی

نویسندگان

صنعتی شریف

چکیده

یکی از مراحل مهم در طراحی زیرسامانه‌های فضایی تحلیل جامع رفتار حرارتی سیال خنک‌کننده درون کانال‌های خنک‌کاری بازیابی برای دستیابی به طراحی بهینه، بهبود عملکرد و افزایش عمر می‌باشد. در سامانه‌های پیشران متان- پایه، تحلیل حرارتی خنک‌کننده‌ متانی برای پیش‌بینی خواص ترمودینامیکی که وابسته به دمای محلی و فشار می‌باشند، اهمیت ویژه‌ای دارد. خنک‌کننده‌ متانی با پدیده‌هایی از جمله تغییر رژیم جریان و افت انتقال حرارت بهدلیل گرادیان دمای بالای نزدیک دیواره، عدد رینولدز بالا و هندسه سه‌بعدی مسیرها مواجه خواهد شد. در پژوهش حاضر، حلگری سه‌بعدی برای شبیه‌سازی انتقال حرارت جابجایی جریان متان فوق‌بحرانی درون کانال خنک‌کاری مستطیلی توسعه داده شده است. اعتبارسنجی حلگر با استفاده از دادههای تجربی متان در آزمون‌های MTP انجام شده و دقت روابط ناسلت مختلف برای تخمین ضریب انتقال حرارت متان در فشارهای فوق‌بحرانی ارزیابی شده‌اند. به‌علاوه، روابط عدد ناسلت موجود برای متان فوق‌بحرانی درون کانال مستطیلی توسعه داده شده‌اند. دقت روابط اصلاح ‌شده در فشارهای خروجی، شارهای دیواره و دبی‌های ورودی مختلف مطالعه شده‌اند. روابط ناسلت اصلاح‌ شده در فشارهای بالاتر از 8 MPa و نرخ انتقال حرارت کمتر از 13 kW خطای کمتر از 10% دارند.‌

کلیدواژه‌ها

20.1001.1.23223278.1397.7.2.1.7

عنوان مقاله [English]

Convective Heat Transfer Analysis of Supercritical-Pressure Methane in a Regenerative Cooling Channel

نویسندگان [English]

abbas ebrahimi
maryam shokri

sharif

چکیده [English]

Comprehensive analysis of coolant thermal behavior in regenerative cooling channels is one of the main steps in optimum design of launch vehicles. In methane-based propulsion systems, thermal analysis of methane coolant is important to predict the thermodynamic properties which depend on local temperature and pressure. Methane may experience a state change from subcritical to supercritical and heat transfer deterioration due to the high temperature gradients in the proximity of the walls, high Reynolds numbers, and three-dimensional flow structures in cooling channels. In the present study, a computational fluid dynamics solver was developed, which is able to simulate the convective heat transfer of supercritical methane coolant ﬂow inside rectangular cooling channels. The solver was validated using reliable experimental data. The coefficients of current Nusselt number correlations were improved using minimization of relative root mean square error. Additionally, the entrance-region effects on heat transfer coefficient were simulated. The accuracy of the proposed relations was studied at different operating conditions. The proposed modified Nusselt correlations have errors less than 10% at outlet pressures higher than 8 MPa and heat transfer rates lower than 13 kW.

کلیدواژه‌ها [English]

Conjugate Heat Transfer
Supercritical Methane
SIMPLEC
Nusselt

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