کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1275371 1497559 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reducing the idle speed of an SI CNG engine fueled by HCNG with high hydrogen ratio
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Reducing the idle speed of an SI CNG engine fueled by HCNG with high hydrogen ratio
چکیده انگلیسی

This paper presents an experimental study aimed at idle characteristics of a CNG engine fueled by HCNG with 55% hydrogen blend. The idle speed was reduced from original 800 r/min to 750 r/min and 700 r/min, and the characteristics of combustion & emissions at reduced idle speed were investigated. It is found that, for the HCNG engine, only reducing idle speed cannot reduce fuel consumption at conditions of fixed λ. In order to reduce fuel consumption and keep the COV at rather low levels, the excess air ratio must be increased properly while reducing the engine idle speed. Due to the large valve overlap (30°) of this inlet inject HCNG engine, CH4 emissions are mainly caused by scavenging, which account for the vast majority of THC emissions. The emissions of CO, THC and NOx are reduced with the decrease of ignition advance angle at a fixed λ.


► We study idle characteristics of CNG engine fueled by HCNG.
► The idle speed was reduced from original 800 r/min to 750 r/min and 700 r/min.
► Only reducing idle speed cannot reduce fuel consumption at fixed λ.
► CH4 emissions are mainly caused by scavenging because of large valve overlap.
► CO, THC and NOx Emissions are reduced with the decrease of θi at fixed λ.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 37, Issue 10, May 2012, Pages 8698–8703
نویسندگان
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