Castor biodiesel (CBD) was manufactured by slow pyrolysis of oil from highly yielded seeds with anhydrous sodium hydroxide catalyst. An experimental study of engine’s performance, emissions and combustion characteristics using biodiesel blended with gas oil in volumetric ratios of 0, 10, 25, 50, 75, and 100% at different loads was performed. Increase of CBD percentage in the blend led to a reduction in engine’s thermal efficiency, cylinder pressure, net heat release rate, and smoke emission. The exhaust gas temperature, specific fuel consumption, unburned hydrocarbon, CO, and nitrogen oxide emissions were increased with the increase of CBD ratio. Biodiesel showed the maximum increase in specific fuel consumption by 10% and the thermal efficiency was decreased by 10.5% about pure diesel. Smoke emissions were decreased for CBD100 by 12% about gas oil. The maximum increases in NO_x, CO, HC emissions, and exhaust gas temperature for CBD 100 were 22, 34, 48, and 11%, respectively related to diesel oil. The maximum reductions in cylinder pressure and net heat release rate were 5 and 13% for CBD100 about gas oil, respectively. Biodiesel percentage of 10% showed near values of performance parameters and emissions to gas oil, so, it is recommended as the optimum percentage.

蓖麻生物柴油（CBD）是通过用无水氢氧化钠催化剂缓慢热解高产种子中的油而制得的。使用生物柴油与瓦斯油混合以不同负载下的体积比为0、10、25、50、75和100％进行的发动机性能，排放和燃烧特性的实验研究。混合物中CBD百分比的增加导致发动机的热效率，气缸压力，净热释放率和烟尘排放降低。随着CBD比率的增加，废气温度，比燃料消耗，未燃烧的碳氢化合物，CO和氮氧化物的排放量也增加。与纯柴油相比，生物柴油的单位油耗最大增加了10％，热效率降低了10.5％。CBD100的烟雾排放量比粗柴油降低了12％。NO的最大增加CBD 100的_x，CO，HC排放量和废气温度分别为22％，34％，48％和11％与柴油有关。对于粗柴油，CBD100的气缸压力和净放热率的最大降低分别为5％和13％。10％的生物柴油百分比表明性能参数和瓦斯油的排放值接近，因此建议将其作为最佳百分比。