直喷式柴油机性能与排放的准维模拟

金昶明　 卓斌　

摘　要：建立了直喷式柴油机缸内燃空混合与燃烧过程的多区准维模型，考虑了滴径分布、液滴蒸发、着火延迟、对流与辐射换热、缸内温度均匀化和空气涡流的瞬时角速度等影响性能和排放的主要因素，并采用紊流射流理论推出了一个壁面射流模型，在正确描述喷注贯穿的基础上细致地建立了空气卷吸模型。建立了NOx模型和反映碳烟成核、增长和表面凝聚的微观机理模型，初步分析了燃烧室形状对涡流衰减和排放的影响。通过对10个工况的计算表明，模型预测与实测结果基本吻合，具有一定的实用性。
关键词：直喷式柴油机；燃空混合；性能；排放；模拟
分类号：TK421；O24　文献标识码：A
文章编号：1000-0909（2001）01-0029-07

Quasi-Dimension Modeling of Performance and Emissions for Direct Injection Diesel Engines

JIN Chang-ming（School of Power and Energy Engineering,Shanghai Jiaoto ng University,Shanghai 00030）　
ZHUO Bin（School of Power and Energy Engineering,Shanghai Jiaoto ng University,Shanghai 00030）　

Abstract：A model for the prediction of air-fuel mixing and combustion process of DI diesel engines has been formulated and developed.This model is a quasi-dimensional one and is based on multi-zone spray-mixing approach.The model considers t he main factors affecting performance and emissions such as the drop size distribution,vaporation,ignition delay,convective and radiative heat transfer,temperature homogenization in the cylinder and instantaneous swirl,etc.The theory of turbulent jet has been employed to induce a model of wall jet.On the basis of spray penetration,air entrainment model has been built in a meticulous way.Furthermore,a model for prediction of NOx and a model that shows soot nuclei,spherule growth and aggregation have been developed.The effect of p iston bowl shape on swirl and emissions has been analyzed.Through calculations f or 10 working conditions,good agreement between theoretical and experimental results shows the validity of the model.
Keywords：Direct injection diesel engine;Air-f uel mixing;Performance;Emissions;Modeling
作者简介：金昶明(1973－)，男，博士，主要研究方向为 涡轮增压柴油机性能与排放优化及电控策略。
作者单位：金昶明（上海交通大学动力与能源工程学院，上海 200030）　
　　　　　卓斌（上海交通大学动力与能源工程学院，上海 200030）　

参考文献：

［1］HIROYASU H,KADOTA T,ARAI M.Development and Use of a Spray Combustion Modeling to Predict Diesel Engine Efficiency and Pollutant Emissions(Part 1:Combustion Modeling)［J］.Bulletin of the JSME,1983,26(214):569～575.
［2］DENT J C,METHA P S.Phenomenological Combustion Model for a Quiescent Chamber Diesel Engine［C］.SAE Paper 811235.
［3］BAZARI Z.A DI Diesel Combustion and Emission Pre di ctive Capability for Use in Cycle Simulation［C］.SAE Paper 920462.
［4］PAYRI F,BENAJES J,TINAUT F V.A Phenomenological Combustion Mod el for Direct Injection Compression Ignition Engines［J］.Appl Math Modelling,1988,1 2：293～304.
［5］GUPTA Ajit K,MEHTA P S,GUPTA C P.Models for Predicting Air-Fuel Mixing and Combustion for Direct Injection Diesel Engine［C］.SAE Paper 860331.
［6］金国栋.直喷式柴油机燃烧模型的探讨［J］.内燃机工程，1986，8(3 )：33～43.
［7］IDOUM A,PACKER J P,WALLACE F J,et al.An Experimental and Analy tical Study of Jet Impingement and Wall Jets in High Swirl D.I.Diesel Engines using the Hydraulic Analogy［C］.SAE Paper 850263.
［8］IKEGAMI M,SHIOJI M,KOIKE M.A Stochastic Approach To Model The Combustion Process in Direct Injection Diesel Engines［C］.Twentieth Symposium Inter national on Combustion/The Combustion Institute,1984.217～224.
［9］HIRO Hiroyasu,MASATAKA Arai.Stucture of Fuel Sprays in Diesel Engines［C］.SAE Paper 900475.
［10］盛宏至.适用于多种工况的直喷式柴油机燃烧模型［J］.内燃机学报，1985，3(3)：210.
［11］崔　毅.增压柴油机瞬态排放性能研究：［学位论文］［D］.上海 ：上海交通大学，1999.
［12］KYRIAKIDES S C,DENT J C,MEHTA P S.Phenomenolog ical Diesel Combustion Model Including Smoke and NO Emission［C］.SAE Paper 860330.
［13］METHA P S,GUPTA A K,GUPTA C P.Models for Prediction of Incyl inder and Exhaust Soot Emmissions from Direct Injection Diesel Engines［C］.SAE Paper 881251.
［14］MATSUI Y,KANIMOTO T,MATSUOKA S.Formation and Oxidation Processes of Soot Particles in a DI Diesel Engine--An Experimental Study via the Two-Colour Method［C］.SAE Paper 820464.

收稿日期：1999年8月19日

修稿日期：1999年10月14日

出版日期：2001年1月1日