用光导纤维多色法对柴油机燃烧室内火焰温度与碳粒生成的研究

本文介绍了作者研制的分叉光导纤维４色法测量装置和采用它对直喷式４１３５型柴油机燃烧室内火焰温度和碳烟浓度测量的结果。以双色法为基础的４色法，通过数学方法可优化试验结果，减小测量误差。测量结果表明：在燃烧过程中，碳粒生成时间落后于温度上升时间，持续高温产生碳粒高浓度，后燃烧使碳粒浓度增加。随着负荷的增加，燃烧火焰温度及碳粒浓度增加，它们持续的时间也延长。燃烧终了破粒浓度和排气烟度增大。在喷注区会产生很高的碳粒质量浓度值，稀混合气区火焰温度上升较早。过后燃烧或供油提前角减小，使燃烧终了碳粒浓度增大。

A Study on Flame Temperature and Soot Formation in Combustion Chamber of D. I. Diesel Engine by Multi-Optical Fiber Poly-Color Method

In this paper, the authors describe the multi-optical fiber four-color method, a new divicebased on this method, and the measuring results of the flame temperature and soot concentrationin combustion churner of model 4135 D. 1. diesel engine from this device. Poly-Color method isbased on Two-Color method, but can optimized the experimental results by mathematical methodto reduce measuring error. The experimental results show: In the process of combustion, sootformation appears later than flame temperature begines to rise, the last time of high flame temperature results in high soot concentration, and later combustion causes soot concentration to increase. As the load growing, the flame temperature and soot concentration increase, and the lasttime of high flame temperature and high soot concentration prolongs, the soot concentration at theend of combustion and exhaustion smoke increase. In addition, high soot concentration is obtainedat the fuel spray area, and flame temperature rises early at the thin fuel-air mixed area, later combustion or later fuel injection can make soot concentration increase at the end of combustion.