دانش و فناوری هوافضا

دانش و فناوری هوافضا

بررسی تجربی اثر شرایط عملکردی بر کارایی پمپ دنده خارجی تحت لقی جانبی متفاوت

نوع مقاله : مقاله پژوهشی

نویسندگان
امیر اسلامیان کوپایی 1
مجید قاسمی 2
1 دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیر الدین طوسی، تهران، ایران
2 استاد، دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیر الدین طوسی، تهران، ایران
چکیده
پمپ‌های دنده خارجی با قابلیت تامین سیال پرفشار در انژکتورهای پاشش سوخت پیشران‌ها، کاربرد گسترده‌ای در صنایع هوافضا دارند. شرایط عملکردی تاثیر بسزایی بر کارایی حجمی و نشت داخلی این پمپ‌ها دارد. در این مطالعه‌، اثر سرعت دورانی (2000، 4000 و 6000 دور بر دقیقه) و عدد کاویتاسیون (05/0 تا 2) برای دو لقی جانبی متفاوت در دو فشار خروجی بررسی شد. با رصد خط شفاف ورودی، شکل‌گیری حباب در عدد کاویتاسیون کمتر از 3/0، بسته به شرایط کاری مشاهده شد. اختلاف دبی روش‌های جرمی و توربینی برای رصد کاویتاسیون شدید استفاده شد. نتایج نشان داد که کاهش لقی جانبی از 5/7 به 5 میکرون در عدد کاویتاسیون 1 تاثیر ناچیزی بر دبی داشت، در اعداد کمتر از واحد موجب افزایش دبی (4/3% در عدد کاویتاسیون 525/0، سرعت rpm 2000 و فشار خروجی psi 20) و در اعداد بالاتر از واحد با مهار نشت جانبی منفی، سبب کاهش دبی شد.
کلیدواژه‌ها
پمپ دنده خارجی
کاویتاسیون
لقی جانبی
کارایی حجمی
دبی
موضوعات

عنوان مقاله English

Experimental assessment of operating condition influences on external gear pump performance under different side clearances

نویسندگان English

Amir Eslamian koupaei 1
Majid Ghassemi 2
1 PhD Candidate, Mechanical Engineering Department, K.N.T. University of Technology, Iran
2 Professor, Mechanical Engineering Department, K.N.T. University of Technology, Iran.
چکیده English

External gear pumps, capable of delivering high-pressure fluid to propulsion fuel injectors, are widely utilized in aerospace industries. Operating conditions significantly influence the volumetric efficiency and internal leakage of these pumps. This study investigates the effects of rotational speed (2000, 4000, and 6000 rpm) and cavitation number (0.05 to 2) for two distinct side clearances under two outlet pressure conditions. Visualizing the transparent inlet line revealed bubble formation at cavitation numbers below 0.3, depending on operating conditions. The discrepancy between mass and turbine flow rate methods was utilized to monitor severe cavitation. Results indicated that reducing side clearance from 7.5 to 5 microns had a negligible impact on flow rate at cavitation number 1. At numbers below unity, it increased flow rate (3.4% at cavitation number 0.525, 2000 rpm and an outlet pressure of 20 psi), whereas at numbers above unity, it reduced flow rate by suppressing negative side leakage.

کلیدواژه‌ها English

external gear pump
cavitation
side clearance
volumetric efficiency
flow
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