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为了区别各个基本参数对着火过程的影响,设计了一个特殊的高压高温容器。该容器能使燃料喷入具有900K 温度和60bar 压力的空气中。其四侧设有光线通道,可以利用高速纹影摄影从两个相互垂直的方向上研究油束的扩展和着火过程。此外,还用光导纤维测定着火。该容器可换气,能在很短的时间间隔内重复喷油。用这一新装置可确定柴油机燃料参数对滞燃期的影响。评定的参数包括化学结构、粘度、蒸发性以及着火促进剂。除了考虑其它几项因素外,本研究还表明:尼其在使用着火促进剂的情况下,十六烷位本身不足以表征燃油的自燃特性。另外,还评定了包括喷油量、压力值和喷油嘴结构在内的诸喷油参数的影响。
In order to distinguish the influence of each basic parameter on the ignition process, a special high pressure and temperature vessel was designed. The container allows fuel to be injected into the air at 900 K and 60 bar pressure. There are light channels on four sides to study the expansion and ignition of the oil bundles from two mutually perpendicular directions using high-speed schlieren photography. In addition, the optical fiber was used to measure the fire. The container can be ventilated, can be repeated in a short time interval injection. With this new device, the effect of diesel fuel parameters on the ignition delay can be determined. The parameters assessed included chemical structure, viscosity, volatility and ignition enhancer. In addition to considering several other factors, the present study also shows that the use of a fire-promoting agent in the niche does not adequately characterize the spontaneous combustion behavior of the fuel oil. In addition, the effects of fuel injection parameters, including fuel injection quantity, pressure value and injector configuration, were also evaluated.