In the current time, sustainability and development of internal combustion engines is subjected to two kinds of threats which are fossil fuel depletion and environmental pollution. So, considerable efforts in the world have been exerted to develop and introduce alternative gaseous fuels to replace conventional fuel by partial or total replacement. In this study, the effect of adding acetylene to LPG-fuelled SI engine has been examined. This addition was with flow rates of 500, 750 and 1000 g/h for 25 % load and 1000 g/h for 50 % load, respectively. An experimental investigation has been carried out on 4 stroke, 4- cylinder, water-cooled spark ignition (SI) engine at constant speed (1500 rpm). Also, performance and emissions parameters have been tested at different excess air coefficients (λ = 0.8, 1, 1.2 and 1.7). As a result, it has been found optimum conditions which are the addition of 750 g/h acetylene for 25 % load (almost 41 % of the LPG-acetylene mixture at λ = 1.2) and 1000 g/h for 50 % load (almost 36 % of the LPG-acetylene mixture at λ = 1.5). In addition, hydrocarbon (HC) and carbon monoxide (CO) emissions decreased, while NO emissions increased when compared to that of baseline LPG operation.

当前，内燃机的可持续性和发展受到化石燃料消耗和环境污染两种威胁。因此，世界上已经做出了相当大的努力来开发和引入替代气态燃料以通过部分或全部替代来替代常规燃料。在这项研究中，已经研究了将乙炔添加到以LPG为燃料的SI发动机中的效果。该添加的流量分别为25％负载时为500、750和1000 g / h，50％负载时为1000 g / h。已对4冲程4缸水冷式火花点火（SI）发动机以恒定速度（1500 rpm）进行了实验研究。此外，性能和排放参数已在不同的过量空气系数（λ= 0.8、1、1.2和1.7）。结果，发现了最佳条件，即添加750 g / h的乙炔用于25％的负荷（在λ = 1.2时，几乎是41％的LPG-乙炔混合物）和1000 g / h的50％负荷（几乎λ = 1.5时，有36％的LPG-乙炔混合物。此外，与基准LPG运行相比，碳氢化合物（HC）和一氧化碳（CO）排放量减少，而NO排放量增加。