مکانیک هوافضا

مکانیک هوافضا

افزایش دقّت شبیه‌سازی عددی احتراق دوفازی در محفظه احتراق موتور راکت مجرایی

نوع مقاله : گرایش پیشرانش و انتقال حرارت

نویسندگان
1 کارشناسی ارشد، دانشگاه صنعتی مالک اشتر، تهران، ایران
2 دانشیار ، دانشگاه صنعتی مالک اشتر، تهران، ایران
چکیده
در پژوهش حاضر، به بررسی افزایش دقّت شبیه‌سازی عددی احتراق دوفازی در محفظه احتراق موتور راکت مجرایی پرداخته شده است. مسئله حاضر شامل دو جریان سوخت با فاز گاز و جامد است. برای شبیه‌سازی عددی احتراق دوفازی در موتور راکت مجرایی، از نرم‌افزار انسیس فلوئنت استفاده شده است. برای مدل‌سازی آشفتگی، مدل دو معادله‌ای کا اپسیلون آراِن‌جی در نظر گرفته شده است. همچنین، برای مدل‌سازی احتراق و ذرات کربن جامد به ترتیب از مدل احتراقی غیر پیش‌آمیخته و مدل دی‌پی‌اِم استفاده شده است. استفاده از سلول شبکه‌بندی بی‌سازمان، بررسی حساسیت نتایج حل عددی به تعداد سلول شبکه‌بندی، مقدار حد اشتعال‌پذیری جریان سوخت جامد و استفاده از مدل توربو لنت دیسپرژن و زیربخش‌های آن در مدل‌سازی فاز گسسته، تفاوت‌های اعمالی در پژوهش سی‌اف‌دی حاضر است. در واقع، استفاده از مدل توربو لنت دیسپرژن و زیربخش‌های آن، تأثیر عمده‌ای بر بهترشدن شبیه‌سازی‌های عددی انجام شده، داشته است. اختلاف بین راندمان‌های احتراق دوفازی سی‌اف‌دی به‌دست‌آمده در کار حاضر و راندمان‌های احتراق دوفازی حاصل از کار تجربی، در پیکربندی‌های 1، 2، 3، 4 و 5 به ترتیب به میزان 22%، 6%، 4/0%، 4% و 5% کاهش‌یافته که به معنای افزایش دقّت شبیه‌سازی عددی احتراق دوفازی در کار حاضر است.

چکیده تصویری

افزایش دقّت شبیه‌سازی عددی احتراق دوفازی در محفظه احتراق موتور راکت مجرایی
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Increase the Accuracy of Two-Phase Combustion Numerical Simulation in Combustion Chamber of Ducted Rocket Engine

نویسندگان English

Mahdi Dehghan 1
Jalal Mohammadi 2
1 Master's degree, Malek Ashtar University of Technology, Tehran, Iran
2 Associate Professor, Malek Ashtar University of Technology, Tehran, Iran
چکیده English

In the present study, the increase in the accuracy of numerical simulation of two-phase combustion in the combustion chamber of a ducted rocket engine has been investigated. The present problem includes two fuel flows with gas and solid phases. For the numerical simulation of two-phase combustion in a ducted rocket engine, ANSYS Fluent software has been used. For the modeling of turbulence, the two-equation model of k-ε RNG has been intended. Also, for the modeling of combustion and solid carbon particles, the non-premixed combustion model and the DPM model have been used, respectively. Using an unorganized grid cell, examining the sensitivity of the numerical solution results to the number of grid cells, the value of the flammability limit of the solid fuel flow, and using the turbulent dispersion model and its sub-parts in discrete phase modeling are the applied differences in the present CFD research. In fact, the use of the turbulent dispersion model and its sub-parts has had a major impact on improving the numerical simulations performed. The difference between the two-phase combustion efficiencies obtained from CFD in the present work and the two-phase combustion efficiencies obtained from the experimental work in configurations 1, 2, 3, 4, and 5 has decreased by 22%, 6%, 0.4%, 4% and 5%, respectively, which means an increase in the accuracy of the numerical simulation of two-phase combustion in the present work.

کلیدواژه‌ها English

Ramjet
Ducted Rocket
Combustion Chamber
Solid Carbon Particles
Combustion Efficiency


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