EFFECT OF COMBUSTION DURATION ON THE OPERATING AND PERFORMANCE CHARACTERISTICS OF A HYDROGEN-ETHANOL DUAL FUELED ENGINE: AN EXPERIMENTAL ANALYSIS
EFFECT OF COMBUSTION DURATION ON THE OPERATING AND PERFORMANCE CHARACTERISTICS OF A HYDROGEN-ETHANOL DUAL FUELED ENGINE: AN EXPERIMENTAL ANALYSIS
复制标题
燃烧持续时间对氢-乙醇双燃料发动机运行和性能特征的影响：实验分析
DOI：
10.15659/ijaat.16.07.323
复制
发表时间：
2016
期刊：
影响因子：
7.4
通讯作者：
S. Yousufuddin
中科院分区：
文献类型：
--
作者：
S. Yousufuddin
本文讨论了燃烧持续时间对发动机运行和性能特性影响的结果。测试是在压燃式发动机（改装为火花点火模式）上进行的，该发动机采用氢-乙醇双燃料组合，具有不同的氢气替代百分比（体积百分比为0-80％，增量为20％），在1500rpm的恒定转速和通过调节负载开关以kW为单位的100％负载下进行。研究了各种发动机工作参数（如压缩比、当量比、火花正时）和发动机性能参数（如制动功率、制动燃油消耗率、制动平均有效压力和制动热效率）对燃烧持续时间的影响。最佳运行条件是在压缩比为 11:1 时获得的，最佳燃料组合是用 60-80% 的氢气替代乙醇。为了在动力性和经济性方面获得更好的性能，本研究发现燃烧持续时间必须在35至42 0 之间。术语 BMEP 制动平均有效压力 BSFC 制动比油耗 BTDC 上止点前 BTE 制动热效率 CA 曲柄角 CHR 累积放热量 CI 压缩点火 CR 压缩比 直流直流 HP 马力 kW 千瓦 MBT 最大制动扭矩 SI 火花点火 VRCS 可变速率冷却系统 简介 在各种替代燃料中，氢和酒精对于能源领域的许多实际应用来说是非常有吸引力的物质。虽然天然气和石油等传统能源是不可再生的，但氢和酒精可以结合起来作为可再生能源。乙醇具有较高的辛烷值，被认为是可再生燃料，发动机只需稍作修改即可。由于乙醇的辛烷值较高，因此可以提高压缩比 (CR)。在高 CR 下运行可降低燃料消耗，由于酒精的燃烧热较低，因此燃料消耗相对较高。用于内燃机的氢气是一种非常轻的气体燃料，具有一些独特且非常理想的特性，例如最清洁的燃烧化学燃料，在空气中的可燃性范围比丙烷、甲烷或汽油更宽，以及氢空气混合物的燃烧速度更高，大约是汽油-空气混合物的六倍。用氢气富集乙醇可以帮助解决冷启动问题，同时增加许多其他优点。燃料富氢已被证明可以延长燃料的稀薄极限并实现高稀释燃烧状态[1]。
This paper discusses the results of the effect of combustion duration on the engine’s operating and performance characteristics. The tests were conducted on a compression ignition engine (modified to run on spark ignition mode) fueled with hydrogen–ethanol dual fuel combination with different percentage substitutions of hydrogen (0–80% by volume with an increment of 20%) at a constant speed of 1500 rpm and a load of 100% in kW by adjusting the loading switches. The various engine operating parameters like compression ratio, equivalence ratio, spark timing, and engine’s performance parameters like brake power, brake specific fuel consumption, brake mean effective pressure, and brake thermal efficiency effect on combustion duration were studied. The best operating conditions were obtained at a compression ratio of 11:1 and the optimum fuel combination was found to be 60–80% hydrogen substitution to ethanol. For better performance in terms of power and economy, it was found from the present study that the combustion duration has to be in between 35 to 42 0 . NOMENCLATURE BMEP brake mean effective pressure BSFC brake specific fuel consumption BTDC before top dead center BTE brake thermal efficiency CA crank angle CHR cumulative heat release CI compression ignition CR compression ratio DC direct current HP horse power kW kilo watt MBT maximum brake torque SI spark ignition VRCS variable rate cooling system INTRODUCTION Among the various alternative fuels hydrogen and alcohol are very attractive substances for many practical applications in the energy sector. While conventional energy sources such as natural gas and oil are non-renewable, hydrogen and alcohol can be coupled to act as renewable energy sources. Ethanol has a higher octane rating is considered a renewable fuel and the engine needs to be only slightly modified. The increase in compression ratio (CR) is possible with ethanol because of its high octane number. Operation at high CR reduces fuel consumption, which is relatively high because of alcohol’s low heat of combustion. Hydrogen for applications in internal combustion engines is remarkably a light gaseous fuel having some unique and highly desirable properties like cleanest burning chemical fuel wider limits of flammability in air than propane, methane or gasoline and higher burning velocity of hydrogen air mixture which is about six times higher than that of the gasoline–air mixture. Enriching ethanol with hydrogen could help solve the cold starting issue while adding many other advantages. Hydrogen enriching of fuels has been shown to extend the lean limit of the fuel and enable high dilution combustion regimes [1].