EVALUATION OF ACETYLENE AS A SPARK-IGNITION ENGINE FUEL
EVALUATION OF ACETYLENE AS A SPARK-IGNITION ENGINE FUEL
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DOI：
10.1002/er.4440030107
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发表时间：
1979-01-01
影响因子：
4.6
通讯作者：
STEBAR, RF
中科院分区：
文献类型：
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作者：
HILDEN, DL;STEBAR, RF
尽管乙炔作为火花点火发动机的燃料存在已知的缺点，但它已被建议作为石油基燃料的可能替代品，因为它可以从非石油资源（煤，石灰石和水）中生产。因此，在单缸发动机中评估乙炔以研究性能和排放特性，特别强调用于NOx控制的稀薄操作。测试是在恒定速度、恒定气流和MBT火花正时下进行的。当量比和压缩比是主要的变量。发动机运行时，乙炔比汽油更稀薄。使用乙炔时，发动机在压缩比为4和6时的当量比分别为0.53和0.43。然而，操作范围非常有限。爆震诱导早燃发生在压缩比大于6或当量比大于0·69的混合气中。乙炔燃料的指示热效率和功率输出均低于汽油。乙炔燃烧发生在足够稀的当量比下，产生非常低的NOx和CO排放。尽管在这项乙炔燃料的研究中证明了NOx控制的潜力，但遇到的发动机爆震和提前点火的困难以及与乙炔相关的众所周知的安全问题（宽可燃性极限和爆炸性分解）使得这种燃料对于火花点火发动机来说不切实际。
In spite of its known shortcomings as a fuel for spark ignition engines, acetylene has been suggested as a possible alternative to petroleum‐based fuels since it can be produced from non‐petroleum resources (coal, limestone and water). Therefore, acetylene was evaluated in a single‐cylinder engine to investigate performance and emission characteristics with special emphasis on lean operation for NOxcontrol. Testing was carried out at constant speed, constant airflow and MBT spark timing. Equivalence ratio and compression ratio were the primary variables.The engine operated much leaner when fuelled with acetylene than with gasoline. With acetylene, the engine operated at equivalence ratios as lean as 0·53 and 0·43 for compression ratios of 4 and 6, respectively. However, the operating range was very limited. Knock‐induced preignition occurred either with compression ratios above 6 or with mixtures richer than 0·69 equivalence ratio.Both the indicated thermal efficiency and power output were less for acetylene fuelling than for gasoline.Acetylene combustion occurred at sufficiently lean equivalence ratios to produce very low NOxand CO emissions. However, when the low NOxlevels were achieved hydrocarbon control was not improved over that with gasoline.Despite the potential for NOxcontrol demonstrated in this study of acetylene fuelling, difficulties encountered with engine knock and preignition plus well‐known safety problems (wide flammability limits and explosive decomposition) associated with acetylene render this fuel impractical for spark ignition engines.