【作者】 黄勇；

【导师】 张忠进；

【作者基本信息】 吉林大学 ， 热能工程， 2007， 硕士

【摘要】 减轻废气污染和寻找替代能源是当前两大需要解决的问题。乙醇燃料作为汽车的代用燃料,具有抗爆性能好、氧含量高、热效率高、低排放低污染等优点。本文通过在驻车加热器中燃烧三种燃料(汽油,E50,乙醇),研究其燃烧性能和热工性能。燃烧器是驻车加热器中的核心部件,研究三种燃料在不同工况下,燃烧区内温度的变化,分析过量空气系数对燃烧温度的影响,并研究其废气的排放机理和规律,提出废气排放评价方法。另外,本文研究加热器燃用三种燃料的热工性能,对比分析有效换热功率、有效热效率、排烟温度和有效燃油消耗率的变化。结果表明,加热器燃用汽油时,有效换热功率大,有效燃油消耗率低,排烟温度高,但在相同过量空气系数时有效热效率低,废气排放浓度大。加热器燃用醇类燃料时,虽然有效换热功率减小,有效燃油消耗率高,但在相同过量空气系数时有效热效率高,废气排放浓度小,是理想的代用燃料。根据试验研究分析,文章最后,提出了提高热效率和减少污染的措施。更多还原

【Abstract】 At present, it is urgent to reduce exhaust pollutants and look for alternative energy resourse. Ethanol fuel as the alternative vehicle fuel has advantages of good antiknock property, high oxygen content and low exhaust pollutant. This thesis study the burning and thermal performances by combusting three fuels (gasoline, E50, ethanol) in the parking heater. The burner is the core part of the heater. Study the variety of the temperature inside the burner by combusting three fuels under different conditons, analyse the relationship between combustion temperature and excess air coefficient, and study the mechanism and regulation of exhaust pollutants, then put forward exhaust emission assessment method. Otherwise, this thesis studies the thermal performance of the heater by combusting three fuels, and analyses the change of exhaust temperature, valid power and effective heat efficiency by contrast. As a result, the valid power and combusting temperature are higher, when the heater combusts the gasoline. But the effective heat efficiency is lower at the same excess air coefficient and the density of exhaust is bigger. When the heater combusts the alcohol fuels, the valid power is lower, but the effective heat efficiency is higher at the same excess air coefficient and the density of exhaust is lower. Ethanol fuel is an ideal alternative fuel. At last, put forward the improvement of effective heat efficiency and the methods of reducing pollution.更多还原