کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
205691 461123 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of the number and position of nozzle holes on in- and near-nozzle dynamic characteristics of diesel injection
ترجمه فارسی عنوان
اثر تعداد و موقعیت سوراخ نازل در ویژگی های پویا در داخل و نزدیک نازل تزریق دیزل
کلمات کلیدی
اسپری دیزلی با فشار بالا، آرایش سوراخ نازل، تعداد سوراخ نازل، حرکت سوزن جریان نازل نزدیک تصویربرداری فازی کنتراست اشعه ایکس
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• We analyze in- and near-nozzle dynamics of single- and multi-hole diesel injectors.
• An X-ray imaging technique was applied for analysis of dynamic characteristics.
• Number of nozzle holes significantly changes the transient needle behavior.
• Near-nozzle flow characteristics are highly affected by the hole arrangement.
• Multi-hole nozzles generate turbulent initial flow with faster mixing at downstream.

Despite the fact that all modern diesel engines use multi-hole injectors, single-hole injectors are frequently used to understand the fundamental properties of high-pressure diesel injections due to their axisymmetric design of the injector nozzles. A multi-hole injector accommodates many holes around the nozzle axis to deliver adequate amount of fuel with small orifices. The off-axis arrangement of the multi-hole injectors significantly alters the inter- and near-nozzle flow patterns compared to those of the single-hole injectors. This study compares the transient needle motion and near-nozzle flow characteristics of the single- and multi-hole (3-hole and 6-hole) diesel injectors to understand how the difference in hole arrangement and number affects the initial flow development of the diesel injectors. A propagation-based X-ray phase-contrast imaging technique was applied to compare the transient needle motion and near-nozzle flow characteristics of the single- and multi-hole injectors. The comparisons were made by dividing the entire injection process by three sub-stages: opening-transient, quasi-steady and closing-transient.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 150, 15 June 2015, Pages 112–122
نویسندگان
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