Effects of a Self-Pressurized Injection Strategy on the Formation of a Stratified Mixture and the Combustion of an Aviation Kerosene Piston Engine

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS
Haocheng Ji, Lingfeng Zhong, Songhong Li, Yufeng Chen, Rui Liu
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Abstract

The aviation kerosene piston engine (AKPE) is the main power system for small- and medium-sized unmanned aerial vehicles (UAVs). Conventional AKPEs use carburetors or port fuel injection (PFI) as fuel supply, resulting in poor cold start performance and difficulty in forming an economically efficient stratified mixture. In addition, two-stroke AKPEs using carburetors or PFI have serious scavenging losses. These reasons lead to the poor economic performance of conventional AKPEs. Direct injection (DI) can be controlled through precise injection timing to form a stratified mixture. The combustion of stratified mixtures in engines can effectively improve the fuel economy and endurance flight time characteristics of UAVs. As a special DI injector, self-pressurized injectors have great potential in the power field of UAVs. To effectively apply self-pressurized injectors on UAV engines and improve the economy, an engine model and a self-pressurized injector spray model are established and verified in this paper. The single injection strategy and segmented injection strategy for forming stratified mixtures are explored, and the combustion performance is studied. The main conclusions are as follows: the optimal installation angle of the injector is 15°, which yields excellent results in the formation of the mixture at this angle. When the fuel injection quantity is small, utilizing a single injection strategy combined with delaying the end of the injection phase (EOIP) can form a stratified mixture. Reducing the angle difference between the EOIP and the ignition timing can improve the power and economy. As the fuel injection quantity is large, a stratified mixture can be formed through two-stage injection. When the fuel injection ratio is 4:1, the uniformity of the mixture distribution in the combustion chamber is significantly improved. Adjusting the 2nd EOIP between a 35° crank angle (CA) before top dead centre (BTDC) and a 30° CA BTDC can achieve a stratified mixture with good economy and power performance.
自增压喷射策略对航空煤油活塞发动机分层混合气形成及燃烧的影响
航空煤油活塞式发动机(AKPE)是中小型无人机的主要动力系统。传统的akpe使用化油器或进气道燃油喷射(PFI)作为燃料供应,导致冷启动性能差,难以形成经济高效的分层混合气。此外,使用化油器或PFI的二冲程akpe有严重的扫气损失。这些原因导致传统akpe的经济效益不佳。直接喷射(DI)可以通过精确的喷射时间来控制,形成分层的混合物。分层混合气在发动机内的燃烧可以有效改善无人机的燃油经济性和续航飞行时间特性。自增压喷油器作为一种特殊的直喷喷油器,在无人机动力领域具有很大的发展潜力。为了在无人机发动机上有效应用自压喷油器,提高经济性,本文建立了发动机模型和自压喷油器喷射模型,并进行了验证。探讨了形成分层混合气的单次喷射和分段喷射策略,并对燃烧性能进行了研究。主要结论如下:喷油器的最佳安装角为15°,在该角度下混合气的形成效果较好。当喷油量较小时,采用单次喷油策略结合延迟喷油结束阶段(EOIP)可以形成分层混合气。减小起爆点与点火正时之间的角度差可以提高发动机的动力性和经济性。由于喷油量大,两段喷射可形成分层混合气。当喷油比为4:1时,燃烧室内混合气分布的均匀性明显提高。在上止点(BTDC)前35°曲柄角(CA)和30°曲柄角(BTDC)之间调节第二EOIP可以实现分层混合,具有良好的经济性和动力性。
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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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