Using biogas in IC engines takes a toll on the engine performance due to low volumetric efficiency of the dual-fuel mode and low energy density of biogas, however, some engine modifications can be employed to compensate for this loss in performance. The purpose of this study is to investigate the effect of intake air pressure on the engine characteristics of a dual-fuel engine running on biogas and diesel. A single-cylinder four-stroke CI engine is used in dual-fuel mode to perform the tests at different biogas flow rates and different engine loads. A single-stage reciprocating compressor is used to serve as a supercharger to provide air at different pressures to the intake manifold. The results show that the brake thermal efficiency improves by around 2%, and the brake specific energy consumption reduces by 1–4.5% on increasing the intake air pressure. The HC and CO emissions are observed to decrease by around 12% and 15%, respectively. However, very high intake pressures are shown to have less improvement in the HC emissions. There is an increase in the NO_x emissions of around 35% with the increase in intake air pressure, however, high air pressures reduce this increase by an amount of around 7%.

由于双燃料模式的容积效率低和沼气的能量密度低，在IC发动机中使用沼气会损害发动机性能，但是，可以采用一些发动机改进措施来弥补这种性能损失。这项研究的目的是研究进气压力对以沼气和柴油运行的双燃料发动机的发动机特性的影响。单缸四冲程CI发动机在双燃料模式下使用，以不同的沼气流量和不同的发动机负载执行测试。单级往复式压缩机用作增压器，以不同压力向进气歧管提供空气。结果表明，制动器的热效率提高了约2％，制动器的单位能耗降低了1-4。增加进气压力的5％。观察到HC和CO排放分别减少了约12％和15％。但是，非常高的进气压力显示出对HC排放的改善较小。NO增加_x随着进气压力的增加，排放量约为35％，但是，高气压将这种增加量减少了约7％。