بررسی تجربی و عددی مشخصات قطره سازی سوخت‌های دیزل و مازوت تزریق شده ‏از یک انژکتور فشاری-پیچشی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 هیات علمی دانشکده مهندسی هوافضای دانشگاه خواجه نصیرالدین طوسی

2 دانشکده مهندسی هوافضای دانشگاه صنعتی خواجه نصیرالدین طوسی

چکیده

در این پژوهش تلاش شده است تا روش‌های تجربی و عددی، به­ منظور اندازه‌گیری پارامترهای قطره‌شوندگی یک سوخت غیرنیوتنی سنگین نفتی به­ نام مازوت و یک سوخت سبک نفتی به­ نام دیزل، مورد استفاده قرار گیرد و همچنین چگونگی رفتار اسپری این سوخت‌ها مطالعه شود. از تجهیزات تصویربرداری بسیار قدرتمندی برای ثبت تصاویر اسپری سوخت‌ها استفاده شد و با آنالیز تصاویر داده‌های مدنظر استخراج شد. درنهایت، از روش بیشینه آنتروپی برای تحلیل عددی تابع توزیع جریان اسپری سوخت‌ها استفاده شد. از اختلاف فشار 15 بار به بعد تقریبا نرخ جریان جرم سوخت‌ها ثابت باقی می‌ماند (بین 1/6 تا 1/8 گرم بر ثانیه). زاویه مخروط اسپری سوخت مازوت در ابتدا افزایش می‌یابد و پس از آنکه جریان به ­سمت قطره‌سازی‏ کامل نزدیک شود (در دمای بالای 90 درجه و فشار بالای 15 بار)، تقریبا به مقدار ثابت 80 درجه می‌رسد (مخروط زاویه اسپری دیزل هم به مقدار تقریبا ثابت 85 درجه می‌رسد). طول شکست و قطر قطرات نیز با افزایش دما و فشار سوخت روندی نزولی را طی کرده و با توسعه‌‌ کامل جریان، تقریبا به سمت مقدار صفر میل می‌کنند. توزیع قطر اندازه قطرات با افزایش گرانروی سیال و توزیع سرعت قطرات با کاهش گرانروی سیال صاف‌تر و یکنواخت‌تر می‌شود.
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental and Numerical Investigation of Atomization characteristics of Diesel and Mazut Fuel injected from a Pressure-Swirl Atomizer

نویسنده [English]

  • Elyas Rostami 2
1
2 Faculty of Aerospace Engineering, K. N. Toosi University of Technology
چکیده [English]

Experimental and Numerical Investigation of Atomization characteristics of Diesel and Mazut Fuel injected from a Pressure-Swirl Atomizer
 
Elyas Rostami1, Hossein Mahdavy Moghaddam 2*
1- Aerospace Engineering Department, K. N. Toosi University of Technology, Tehran, Iran, elyas.rostami@email.kntu.ac.ir
2- Aerospace Engineering Department, K. N. Toosi University of Technology, Tehran, Iran, mahdavy@kntu.ac.ir
 *Corresponding author
(Received: 2021.05.02, Received in revised form: 2021.06.15, Accepted: 2021.06.23)
 
In this research, an attempt has been made to use experimental and numerical methods to measure the powdering parameters of a heavy non-Newtonian oil fuel called Mazut and a light petroleum fuel called diesel, as well as to investigate the spray behavior of these fuels. Very powerful imaging equipment was used to record the spray images of the fuels and the data were extracted by analyzing the images. Finally, the method of maximum entropy was used for numerical analysis of the distribution function of fuels spray. From a pressure difference of 15 bar onwards, the mass flow rate of the fuel remains almost constant (between 1.6 and 1.8 g/s). The angle of the Mazut fuel spray cone initially increases, and after the flow approaches full atomization (at temperatures above 90 ° and pressures above 15 bar), it reaches approximately a constant value of 80° (the diesel spray cone angle also reaches an almost constant value of 85°). The breakup length and droplets diameter also decrease with increasing fuel temperature and pressure, and with the full development of the flow, they tend to almost zero. The diameter size distribution of droplets becomes smoother and more uniform by increasing the viscosity of the fluid. Also, the velocity distribution of droplets becomes smoother and more uniform by decreasing the viscosity of the fluid.

کلیدواژه‌ها [English]

  • Experimental testing
  • Atomization
  • Numerical solution
  • Maximum entropy

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سابقه مقاله

  • تاریخ دریافت: 12 اردیبهشت 1400
  • تاریخ بازنگری: 25 خرداد 1400
  • تاریخ پذیرش: 02 تیر 1400

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