مطالعه عددی تاثیر ایجاد شیار درون نازل افشانه بر رفتار فواره سوخت های موتور دیزل و بیودیزل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیات علمی / دانشکده مهندسی مکانیک، دانشگاه امام علی (ع)،

2 دانشجوی کارشناسی ارشد / دانشکده مهندسی مکانیک، دانشگاه بین المللی امام خمینی (ره) قزوین

چکیده

در این پژوهش به­ بررسی رفتار پاشش سوخت دیزل و بیودیزل در یک محفظه احتراق استوانه­ای حجم ثابت برای سوراخ نازل دارای شیار به­منظور بهبود خواص فواره سوخت و عملکرد موتور دیزل با کمک دینامیک سیالات محاسباتی پرداخته شده است. بدین­منظور خصوصیات ماکروسکوپیک و میکروسکوپیک فواره سوخت دیزل و بیودیزل برای هندسه­ سوراخ نازل ایجاد شده به­صورت عددی و به کمک نرم­افزارهای ای وی ال فایر و متلب مدل­سازی و مورد تحلیل قرار گرفته است. ابتدا جریان سوخت مایع درون افشانه دارای سوراخ نازل استوانه­ای و مخروطی همگرا مدل­سازی شده و در ادامه از سوخت دیزل و بیودیزل در سوراخ نازل دارای شیار استفاده شده است. نتایج عددی حاصل نشان می­دهند که در این حالت بیودیزل دارای طول نفوذ کمتر و قطر ذرات و زاویه مخروطی فواره بیشتری می­باشد. بنابراین خصوصیات ماکروسکوپیک و میکروسکوپیک فواره سوخت­های مختلف با ایجاد شیار می­توانند بهبود یافته و کنترل شوند. نتایج عددی و داده­های تجربی در تحقیقات پیشین اعتبارسنجی شده­اند.

کلیدواژه‌ها

عنوان مقاله [English]

Numerical investigation on the effect of creating grooves inside the injector nozzle on the diesel and biodiesel engine fuels spray behavior

نویسندگان [English]

  • Amirhamzeh Farajollahi 1
  • reza firuzi 2
1 Assistant Professor, Mechanical Engineering Department, Imam Ali university
2 MSc Student, Mechanical Engineering Department, Imam Khomeini International University
چکیده [English]

In this study, spray behavior of diesel and biodiesel fuel in a cylinderical fixed volume combustion chamber for a grooved nozzle hole has been investigated using CFD in order to improving the fuel spray characteristics and diesel engine performance. To this end, microscopic and macroscopic diesel and biodiesel fuel spray characteristics are modeled and investigated using AVL-Fire and Matlab software. Firstly, the liquid fuel flow inside the injector with cylindrical and converged conical nozzle holes have been modeled and then in the following diesel and biodiesel fuels have been used in the grooved nozzle hole.   Numerical results show that in this case, biodiesel spray has smaller penetration length and bigger cone angle and SMD. Thus spray macroscopic and microscopic characteristics can be improved and controlled for different fuels by creating grooves inside the nozzle hole. Numerical results and experimental data was validated from previous researches.

کلیدواژه‌ها [English]

  • Injector nozzle hole
  • Groove
  • Diesel
  • Biodiesel
  • Spray

مراجع

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