کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
765176 1462843 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Performance analysis of a Miller cycle engine by an indirect analysis method with sparking and knock in consideration
ترجمه فارسی عنوان
تجزیه و تحلیل عملکرد موتور چرخه میلر با استفاده از روش تحلیل غیر مستقیم با جرقه زدن و ضربه زدن در نظر گرفته شده است
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
چکیده انگلیسی


• A quasi-dimensional model was adopted to study Miller cycle engine’s performance.
• A new indirect performance analysis method was proposed.
• The definition of effective compression ratio was modified.
• The modified effective compression ratio takes the trapped mixture mass in account.
• The factors limiting the fuel economy in Miller cycle engine were found out.

In this paper, a full-factorial design of experiment was applied to thoroughly investigate the effects of compression ratio, intake valve closing retardation angle, and engine speed on the fuel consumption performance and power performance of the Miller cycle engine based on a quasi-dimensional simulation model. A new indirect analysis method based on formula derivation and main effect analysis was proposed to simplify the complex relationship between the design factors and the performance parameters. The definition of effective compression ratio was modified to take account of the actual mass of mixture trapped in the cylinder. The results show that the distributions of brake mean effective pressure and brake specific fuel consumption can be regarded as the re-organization results from the distributions of volumetric efficiency and indicated efficiency. The intake valve closing retardation angle has a strong negative correlation with volumetric efficiency. The modified effective compression ratio is the approximate product of the compression ratio and the volumetric efficiency, and makes obvious effects on the distribution of the indicated efficiency. Therefore the combustion process is co-evolved with the intake process in a Miller cycle engine. The further improvement of brake specific fuel consumption is mainly limited by four factors, i.e., the back flow loss, the exergy loss, the incomplete expansion loss, and the combustion loss. The improvement of fuel consumption performance is at a cost of power performance, and the trade-off between the both essentially results from the knock constraint. The engine speed makes obviously effects on both volumetric efficiency and indicated efficiency, resulting in increasing the nonlinearity of the variation of the performance parameters. However, the nonlinearity provides a possibility for a Miller cycle range extender to improve the fuel consumption performance and power performance at same time by optimizing the controlled speed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy Conversion and Management - Volume 119, 1 July 2016, Pages 316–326
نویسندگان
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