مکانیک سیالات و آیرودینامیک

مکانیک سیالات و آیرودینامیک

بررسی عددی تأثیر پاشش بخارآب در محفظه احتراق موتور توربینی بر روی عملکرد موتور

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناسی ارشد، دانشگاه جامع امام حسین (ع)، تهران، ایران
2 استاد، دانشگاه جامع امام حسین (ع)، تهران، ایران
چکیده
موتورهای توربینی جزء مهمی از صنعت حمل‌ونقل هستند که به علت گستردگی استفاده از آن‌ها، همواره سعی شده تا با روش‌های مختلف بتوان هم میزان توان و رانش موتور را افزایش داد و هم بازده سیکل آن‌ها را بالا برد. یکی از این روش‌ها، استفاده از پاشش بخارآب در محفظه احتراق است. پاشش بخارآب می‌تواند با افزایش دبی جرمی سیال، توان و رانش موتور را افزایش دهد. همچنین می‌تواند دمای خروجی محفظه احتراق را کاهش و از این طریق عمر توربین را افزایش داده و باعث کاهش آلاینده‌ها شود. علاوه بر آن، بخارآب را می‌توان از گازهای خروجی موتور نیز تولید نمود که این امر باعث افزایش بازده کلی سیکل می‌شود. در تحقیق حاضر، پاشش بخارآب در محفظه احتراق موتور ای‌ال‌اف 502 بررسی‌شده است. پاشش بخارآب در دبی‌های مختلف، در چند فشار و نسبت سوخت به هوا مطالعه شده است. جهت انجام محاسبات از نرم‌افزار استار سی‌سی‌ام استفاده شد. سپس با استفاده از نتایج به‌دست‌آمده از آن، سیکل گازی متناظر موتور با کد مطلب نوشته‌شده، تحلیل‌شده و توان و رانش موتور محاسبه گردید و میزان بخارآب تولیدی توسط گازهای خروجی نیز تخمین زده شد. مشاهده شد که تأثیر پاشش بخار بدون افزودن سوخت اضافی به موتور و با استفاده از گازهای خروجی برای تولید بخار، می‌تواند توان موتور را تا 17 درصد افزایش دهد. این مقدار با افزودن سوخت اضافی موردنیاز برای تولید بخار، می‌تواند تا حداکثر 3 برابر توان و حداکثر 3/2 رانش را ارائه دهد.
کلیدواژه‌ها

عنوان مقاله English

Numerical Investigation of The Effect of Spraying Vapor in Combustion Chamber of Turbine Engine on Engine Performance

نویسندگان English

iman mahmoodi 1
mohammad mehdi dostdar 2
1 Master's degree, Imam Hussein (AS) University, Tehran, Iran
2 Professor, Imam Hussein (AS) University, Tehran, Iran
چکیده English

Turbine engines are one of the vital components in the transportation sector. Due to their widespread usage, there have been continuous strides to enhance the power and thrust of the turbine engines and also the overall cycle efficiency using various techniques. One of those techniques is the introduction of steam into the combustion chamber. The addition of steam enhances the mass flow rate of the working fluid, hence increasing the power and thrust of the engine. This would, additionally, reduce the outlet temperature from the combustion chamber and extend the turbine life while reducing the emissions; besides, as mentioned above, the steam generation from exhaust gases of the engine increases the overall cycle efficiency. The investigations are presented over LF502 engine in this study on injecting steam into a combustion chamber. The type of research that has been carried out is dealing with various flow rates and pressures besides fuel to air ratios. Calculations with STAR-CCM+ are carried out, then with a MATLAB code, the analysis for a suitable gas cycle of the engine and engine power and thrust calculation was found, at the same time, producible steam from exhaust gases estimation is done. The tests demonstrated that the injection of steam, solely derived from exhaust gases for the generation of steam without any additional fuel, resulted in power up to a maximum increase of 17%. Moreover, when added the required supplementary fuel to generate steam, three times the power increase and an increase in thrust by two-thirds were achievable.

کلیدواژه‌ها English

Steam Injection
Computational Fluid Dynamics
Combustion Chamber
Power
Cycle Analysis

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دوره 14، شماره 1 - شماره پیاپی 35
بهار و تابستان
شهریور 1404
صفحه 91-104

  • تاریخ دریافت 12 خرداد 1404
  • تاریخ بازنگری 30 تیر 1404
  • تاریخ پذیرش 12 مرداد 1404
  • تاریخ انتشار 01 شهریور 1404