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Biodiesel usage at low temperature

机译：低温使用生物柴油

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摘要

This paper deals with numerical and experimental analysis of the influence of fuel temperature on the injection process. The tested injection system is the mechanically controlled diesel fuel injection M system of a bus diesel engine. The considered fuels are neat biodiesel from rapeseed oil and neat mineral diesel. All injection parameters, obtained with biodiesel, are compared to those of mineral diesel. At first, attention is focused on a single injection assembly (plunger-in-barrel assembly, high pressure tube, and injector). The flow through a single assembly to one cylinder is investigated numerically by using an one-dimensional mathematical model. The injection process is simulated at different operating regimes. On the basis of the numerical results, the influence of fuel temperatures on the injection characteristics, especially on fuelling at some stage of injection, mean injection rate, mean injection pressure, injection delay, and injection timing is investigated in view of harmful emissions reduction. Furthermore, the fuel flow through the whole injection system (all six injection assemblies) to all six cylinders is investigated experimentally with respect to fuel temperature. The pressure drop through the fuel filter and fuelling through each of six injection assemblies are analyzed.
机译：本文对燃油温度对喷射过程的影响进行了数值和实验分析。经过测试的喷射系统是客车柴油机的机械控制柴油喷射M系统。所考虑的燃料是来自菜籽油和纯矿物柴油的纯生物柴油。将生物柴油获得的所有喷射参数与矿物柴油的喷射参数进行比较。首先，注意力集中在单个注射组件（桶中柱塞组件，高压管和注射器）上。使用一维数学模型对从单个组件到一个气缸的流量进行数值研究。在不同的操作方案下模拟注射过程。根据数值结果，考虑到有害排放物的减少，研究了燃料温度对喷射特性的影响，特别是对喷射某些阶段的燃料，平均喷射率，平均喷射压力，喷射延迟和喷射正时的影响。此外，针对燃料温度，对通过整个喷射系统（所有六个喷射组件）流向所有六个气缸的燃料流进行了实验研究。分析了通过燃油滤清器和通过六个喷射组件中的每一个进行加油的压降。

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