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Effects of wall wetting and in-cylinder fuel distribution in an advanced turbo-charged engine

Journal of Central South University 2022年第7期29卷 2165-2178页

作者： ROSTAmPOUR A shojaeefard m h mOLAEImANESh G R SAFAEI-ARShI A School of Automotive Engineering Iran University of Science and TechnologyNarmakTehran ***Iran School of mechanical Engineering Iran University of Science and TechnologyNarmakTehran ***Iran

One of the proposed concepts for spark ignition engines is advanced port fuel injection(APFI),which suggests using two port injectors for each *** this research,we numerically examine the capabilities of this concept in reducing fuel consumption and increasing engine *** results demonstrated that the use of this concept is very effective due to the use of two injectors and the possibility of reducing the spraying time and bringing the injection start time closer to the air inlet valve opening *** maximum amount of fuel film formed on the walls is reduced by about 75%,naturally,which leads to better and more homogeneous fuel distribution inside the combustion chamber and increases combustion *** results showed that under the same boundary conditions and engine operating point,the use of two port injectors for each cylinder leads to an increase of more than 20%of the maximum combustion chamber pressure and about 4%combustion *** the other hand,fuel film formation becomes worse in cold *** in this study,the capabilities of this concept in cold conditions were investigated *** have shown that the advanced port fuel injection,unlike conventional engines,is almost insensitive to inlet temperature changes.

关键词： advanced port fuel injection(APFI) fuel film fuel distribution wall wetting heat transfer phenomena

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Inverse heat Transfer Problem of Thermal Contact Conductance Estimation in Periodically Contacting Surfaces

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Journal of Thermal Science 2009年第2期18卷 150-159页

作者： m.h.shojaeefard K.Goudarzi m.Sh.mazidi Dept. of mechanical Engineering Iran University of Science and Technology

The problems involving periodic contacting surfaces have different practical applications. An inverse heat conductionproblem for estimating the periodic Thermal Contact Conductance (TCC) between one-dimensional, constantproperty contacting solids has been investigated with conjugate gradient method (CGm) of function *** method converges very rapidly and is not so sensitive to the measurement errors. The advantage of thepresent method is that no a priori information is needed on the variation of the unknown quantities, since the solutionautomatically determines the functional form over the specified domain. A simple, straight forward techniqueis utilized to solve the direct, sensitivity and adjoint problems, in order to overcome the difficulties associatedwith numerical methods. Two general classes of results, the results obtained by applying inexact simulatedmeasured data and the results obtained by using data taken from an actual experiment are presented. In addition,extrapolation method is applied to obtain actual results. Generally, the present method effectively improves theexact TCC when exact and inexact simulated measurements input to the analysis. Furthermore, the results obtainedwith CGm and the extrapolation results are in agreement and the little deviations can be negligible.

关键词： thermal contact inverse problem conjugates gradient method

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