柴油机缸内温度测量与放热计算——-基于实测温度、压力的双区计算模型

作者研制了可以用于测量柴油机缸内气体温度的铂--铂铑双丝热电偶传感器,文中叙述了这种热电偶传感器的结构特点。上述传感器与微机快速采样系统联合使用后.作者用双丝法对所采集到的瞬态温度数据进行了修正,从而实测得到双区计算模型所需的缸内气体的温度。本文提出了一种柴油机放热计算的双区计算模型。该模型以实测的未燃区的空气温度作为原始数据之一,与一般的放热计算方法相比,由于多用了一组未燃区的气体温度作为计算中输入的原始数据,它可以算出燃烧过程中任何时刻的燃烧区域的过量空气系数、燃烧区的扩展速率、空气向燃烧区的卷入速率等描述燃烧放热过程的有用参数,因而能够比一般的计算方法更深刻地揭示柴油机燃烧过程进展的特点。

Gas Temperature Measurement inside Diesel Engine Cylinder and Heat Release Calculation--Two-Zone Calculation Model Based on Measured Temperature and Pressure

The structural features of a new-type thermocouple transducer developed bythe authors for measuring the gas temperature inside the diesel engine cylinder isdescribed in this paper.This device,together with a icrocomputer samplingsystem,was used to measure the gas temperature in the unburnt zone inside thediesel engine cylinder.The measured data were revised with the two-wire method.A two-zone simulation model of heat release calculation is presented.Compared with the conventional heat release calculation,the two-zone model is more useful in the study of diesel combustion and heat release by using gas temperature data as well as gas pressure data as the initial data.A series of parameters,such as the expansion rate of the flame zone,the rate of air entrainment to the flame zone,the transitional stoichiometric equivalent air-fuel ratio of the flame,and so on,are derived from this model,which is most useful in describing the combustion history of a diesel engine.