喷射参数对二冲程火花点火直喷航空煤油发动机混合气形成及性能的影响

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS Journal of Energy Resources Technology-transactions of The Asme Pub Date : 2023-10-27 DOI:10.1115/1.4063925
Ying Wang, Qiongyang Zhou
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引用次数: 0

摘要

摘要二冲程火花点火发动机在中小型无人机动力源领域占有重要地位。从燃烧汽油到航空煤油(或重油),从化油器或进气喷射系统到直喷燃油系统,都有一定的过渡。然而,以航空煤油为燃料的二冲程火花点火直喷发动机在重载条件下的性能不是很理想。一般来说,混合气的形成对发动机的燃烧和性能至关重要,而喷射参数对混合气的形成影响很大。因此,本文对二冲程直喷煤油发动机的各种喷射参数进行了研究。结果表明,过早或过晚的喷油时间(tinj)都会使混合气形成恶化,导致制动功率和制动热效率降低。这里最合适的温度为150°CA BTDC。喷油压力(pinj)过高或过低都会造成燃油短路损失,混合气质量较差,最佳喷油压力为10MPa。喷油器安装角(β)太大容易造成燃油喷击,β太小容易造成燃油短路损失。因此,本文的最佳β值为30°。
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Impacts of Injection Parameters on the Mixture Formation and Performance of Two-Stroke Spark-Ignition Direct-Injection Aviation Kerosene Engine
Abstract Two-stroke spark-ignition engines play a significant role in the field of power sources of small and medium unmanned aerial vehicles. There is a certain transition from burning gasoline to aviation kerosene(or heavy oil) and from carburetor or inlet injection system to direct-injection fuel system. However, the performance of two-stroke spark-ignition direct-injection engines fueled with aviation kerosene was not very ideal under heavy loads. Generally, the mixture formation is very key for engine combustion and performance, while injection parameters have great effects on mixture formation. Thus, various injection parameters of a two-stroke direct-injection kerosene engine were examined here. The results showed too early or too late injection timing(tinj) would deteriorate the mixture formation, resulting in lower brake power and brake thermal efficiency. Here the most suitable tinj was 150°CA BTDC. Too high or too low injection pressure(pinj) caused fuel short-circuit loss and poor mixture quality, so the optimum pinj was 10MPa. Too large injector installation angle(β) easily results in fuel spray impingement, and too small β causes fuel short circuit loss. Therefore, the best β was concluded to be 30° in this paper.
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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