کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8055426 | 1519904 | 2018 | 30 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation of self-pulsation characteristics for a liquid-centered swirl coaxial injector with recess
ترجمه فارسی عنوان
بررسی ویژگی های خود پالس برای انژکتور کواکسیال چرخشی متمرکز شده با مایع
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کلمات کلیدی
خود پالس انژکتور کواکسیال چرخش متقاطع مایع، رسیده، پالس فرکانس فوق العاده بالا،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی هوافضا
چکیده انگلیسی
A combined experimental and numerical investigation was conducted to explore the self-pulsation characteristics generated by a liquid-centered swirl coaxial injector with an inner post recess of 5â¯mm. A back-lighting photography technique was employed to capture the instantaneous flow patterns in recess chamber with a high speed camera. Pressure oscillations in recess chamber were also measured by the miniature pressure transducer. 2-D unsteady numerical simulations basing on swirl axi-symmetric model were performed. Good agreements were generally achieved between numerical simulation and experiment in aspect for the mechanism and characteristic frequency of self-pulsation. It was found that the blocking actions of the conical liquid sheet play a crucial role in self-pulsation for the coaxial injector with recess. Self-pulsation occurs coinciding with strong pressure oscillation in recess chamber. The frequencies of spray oscillation and gas pressure in recess chamber correspond well with each other. Self-pulsation frequencies are approximately linearly proportional to the liquid Reynolds number under certain conditions. In addition, the spray oscillation transforms from high frequency pulsation (at about 3000â¯Hz) to ultra-high frequency pulsation (ranging from 8000â¯Hz to 9000â¯Hz) with an increase in the gas Reynolds number when the mass flow rate of liquid is large enough.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Astronautica - Volume 151, October 2018, Pages 511-521
Journal: Acta Astronautica - Volume 151, October 2018, Pages 511-521
نویسندگان
Xiao Bai, Qinglian Li, Peng Cheng, Liyong Sheng, Zhongtao Kang,