بررسی عددی تاثیرات جنس، ضخامت دیواره، تخلخل یک و دو ناحیه‌ای در یک محفظه احتراق برای کاربرد در سیستم‌های ترموفتوولتائیک

عابدی نژاد, محمد صادق; دلیری،, سمانه; تیموری, علیرضا

بررسی عددی تاثیرات جنس، ضخامت دیواره، تخلخل یک و دو ناحیه‌ای در یک محفظه احتراق برای کاربرد در سیستم‌های ترموفتوولتائیک

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه الزهرا، تهران، ایران

² گروه آموزشی مهندسی مکانیک، دانشکده مهندسی، دانشگاه الزهرا، تهران، ایران

³ گروه آموزشی مهندسی مکانیک، دانشکده مهندسی مکانیک،د انشگاه علم و صنعت ایران، تهران، ایران

چکیده

عملکرد محفظه‌های احتراق در سیستم‌های ترموفتوولتائیک به عواملی نظیر جنس محفظه، ضخامت دیواره و حضور محیط متخلخل در محفظه وابسته است که در این پژوهش مورد بررسی قرار گرفته است. به منظور شبیه سازی عددی محفظه از مدل‌های realizable و اضمحلال گردابه- نرخ واکنش محدود به ترتیب برای مدل‌سازی آشفتگی جریان و احتراق گاز هیدروژن استفاده شده است. سه ضخامت دیواره مختلف در سرعت‌های m/s2 و3 مورد بررسی قرار گرفته است. نتایج نشان می‌دهد کاهش ضخامت دیواره سبب افزایش دمای دیواره خارجی و بازده تابشی محفظه می‌گردد. بیشینه دما در سرعت m/s2 و در ضخامت mm2/0 نسبت‌به ضخامت‌های mm5/0 و mm8/0 به میزان 111 و 141 و در سرعت m/s3 به میزان 79 و 107 افزایش می‌یابد. همچنین محفظه احتراق با سه جنس مختلف دیواره و SiC و Stainless Steel (SS316) شبیه‌سازی گردیده است. در حالتی که دیواره از جنس باشد، بازده بیشتری حاصل می‌گردد. در بخشی دیگر حضور دو ناحیه متخلخل در محفظه منجر به تغییر محل تشکیل شعله گردیده است. بازده تابشی در محفظه با حضور دو ناحیه متخلخل نسبت به محفظه تک‌ناحیه متخلخل در نسبت‌های هم‌ارزی 6/0، 8/0 و 1 به ترتیب به میزان %24، %27 و %28 افزایش می‌یابد.

کلیدواژه‌ها

عنوان مقاله [English]

Numerical investigation of the effects of material, wall thickness, one and two zones porousity in a thermo-photovoltaic combustion chamber

نویسندگان [English]

Mohammad Sadegh Abedinejad ¹
Samaneh Daliri, ²
Alireza Teymoori, ³

¹ Department of Mechanical Engineering, Faculty of Engineering & Technology, Alzahra University, Tehran, Iran

² Department of Mechanical Engineering, Faculty of Engineering, Alzahra University, Tehran ,Iran

³ School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

چکیده [English]

The performance of combustion chambers for use in thermo-photovoltaic systems depends on some factors such as the material of chamber, wall thickness, and the presence of porous medium in the combustion chamber, which has been investigated in this research. In order to simulate a numerical model, the realizable k-ε and the finite rate- eddy dissipation models have been used to model flow turbulence and hydrogen gas combustion, respectively. Three different wall thicknesses at constant equivalence ratio of 0.8 and velocities of 2 m/s and 3 m/s have been studied. The results show that decreasing the wall thickness increases the temperature of the outer wall and the radiation efficiency of the chamber. The maximum temperature increases by 111 and 141 °C at the velocity of 2 m/s and at the thickness of 0.2 mm as compared to the thicknesses of 0.5 mm and 0.8 mm and by 79 and 107 °C at the velocity of 3 m/s. Also, the combustion chamber has been simulated with three different materials of walls, Al₂O₃, SiC and Stainless Steel(SS316). The results show that when the wall is made of Al₂O₃, the efficiency is higher. In another part of this research, the presence of two porous zones in the chamber has led to a change in the place of flame formation. The radiation efficiency in the combustion chamber with the presence of two porous regions increases by 24%, 27%, and 28%, respectively, in the equivalence ratios of 0.6, 0.8, and 1.

کلیدواژه‌ها [English]

Thermo
photovoltaic combustion chamber Porous Hydrogen Wall material Numerical simulation Two porous zones

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