مطالعه عددی دینامیک فرایند اختلاط گذربحرانی در انژکتورهای هم‌محور برشی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی شریف

2 دانشکده مهندسی هوافضا، دانشگاه صنعتی شریف، تهران، ایران.

چکیده

یک پژوهش عددی، به­ منظور شناسایی و ارزیابی مشخصه‌های پاشش و اختلاط کرایوژنیکی یک انژکتور هم‌محور برشی واقعی، در شرایط گذربحرانی انجام شده است. بدین­ منظور، از مدل زیرشبکه‌ای گردابه-لزجتی دینامیکی (برای شبیه‌سازی گردابه‌های بزرگ)، معادله حالت پنگ-رابینسون (برای محاسبه خواص ترمودینامیکی)، پایگاه داده NIST (برای تخمین خواص انتقالی سیال کرایوژنیکی) و الگوریتم PISO (برای کوپلینگ سرعت و فشار در حلگر جریان) برای تحلیل ویژگی‌های متعدد جریان برشی هم‌محور آشفته در شرایط گذربحرانی استفاده شده است. همچنین، از نتایج مطالعات تجربی و عددی پیشین برای اعتبارسنجی نتایج عددی پژوهش حاضر استفاده شده که تطابق خوبی بین این نتایج مشاهده می‌شود. در این پژوهش، ضمن آنکه برای نخستین ­بار دینامیک فرایند اختلاط در یک انژکتور هم‌محور برشی واقعی در شرایط گذربحرانی بررسی شده است، با تحلیل کمی و کیفی میدان جریان ورتیکال، فرایند اختلاط بررسی شده است. نتایج این مطالعه نشان می‌دهد که به­ علت اثرات قابل‌توجه پدیده‌های شبه‌جوشش و لایه‌بندی چگالی در ممانعت از رشد پایدار لایه اختلاطی مربوط به جت گذربحرانی، هسته پتانسیلی جت چگال داخلی بسیار بزرگ‌تر از هسته پتانسیلی جت خارجی است. با ‌وجود این، به­ لطف حساسیت بسیار زیاد ظرفیت گرمایی ویژه به تغییرات دما (در حوالی دمای شبه‌جوشش)، نوسانات ناچیز دما قادر به کاهش شدید مقادیر ظرفیت گرمایی ویژه و درنتیجه شکست موضعی لایه محافظ حرارتی می‌شود که به­ نوبه خود امکان عملکرد موثر سازوکارهای مولد ورتیسیته و درنتیجه بهبود کیفیت فرایند اختلاط را به­ وجود می‌آورد. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Investigation of Transcritical Mixing Dynamics of Bi-shear Injectors

نویسندگان [English]

  • محمد فرشچی 1
  • Ata Poormahmood 2
1
2 Department of Aerospace Engineering, Sharif University of Technology, Tehran, Iran.
چکیده [English]

A numerical study has been performed to evaluate the cryogenic injection and mixing characteristics of a real transcritical bi-shear injector. With this aim, a dynamic one-equation eddy-viscosity subgrid-scale model (for large eddy simulation), the Peng-Robinson equation of state (for calculating the thermodynamic properties), the NIST database (for estimating the transport properties) and the PISO algorithm (for velocity-pressure coupling) have been used to analyze various features of the transcritical turbulent bi-shear flow. Observations indicate that there is a good agreement between the results of the present work and previous experimental and numerical studies. Simulations show that due to the remarkable effects of pseudo-boiling and density stratification phenomena in preventing the sustained growth of the transcritical mixing layer, the potential core of the inner dense jet is much longer than that of the outer jet. However, due to the high sensitivity of isobaric specific heat to temperature, especially around the pseudo-boiling temperature, small temperature fluctuations drastically reduce the isobaric specific heat and in turn result in local distortion and weakening of the thermal shield. Subsequently, the vorticity generating mechanisms, including the baroclinic torque and volume dilatation, catch up and efficiently enhance the mixing quality.
.

کلیدواژه‌ها [English]

  • Coaxial shear injector
  • Cryogenic injection and mixing
  • Transcritical condition
  • Density stratification
  • Mixing layer

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  • تاریخ دریافت: 14 بهمن 1399
  • تاریخ بازنگری: 20 فروردین 1400
  • تاریخ پذیرش: 22 فروردین 1400

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