Purpose

Spark ignition (SI) engines are used in a wide area in the transportation industry, from road vehicles to piston-prop aircraft. On the other hand, the decrease in reserves of fossil fuels used in SI engines and the increase in greenhouse gas emissions makes the use of alternative fuels inevitable. In this paper, optimization of in-cylinder combustion and engine performance parameters by intake-charge conditions [i.e. intake-air temperature, injection timing and exhaust gas recirculation (EGR)] in a hydrogen (H₂)-fueled small SI engine is performed.

Design/methodology/approach

Experimental studies were performed at a 1,600 rpm engine speed of a single-cylinder, air-cooled engine having a stroke volume of 476.5 cm³, maximum output power of 13 HP and torque of 25 Nm. The hydrogen-fueled SI engine was operated by a lean air-fuel mixture (ϕ = 0.6) under wide-open throttle (WOT) conditions.

Findings

The findings of the paper show that improvements can be achieved in in-cylinder combustion, indicated engine performance, exhaust NO_x emissions with optimum intake-air temperature, the start of H₂ injection and the ERG rate.

Practical Implications

It has been determined that a 32°C intake-air temperature, 395°C (bTDC) start of H₂ injection, and 5%–10% EGR rates are the most suitable values for the examined hydrogen fueled SI engine.

Originality Value

Hydrogen is a usable alternative fuel for SI engines used in a wide area from road vehicles to piston-prop aircraft engines. However, a number of problems remain that limit hydrogen fueled SI engines to some extent, such as backfire, a decrease of engine power, and high NO_x emissions. Therefore, it is appropriate to examine the effects of intake-charge conditions on in-cylinder combustion, engine performance, and NO_x emissions parameters in a hydrogen fuelled SI engine.

中文翻译：

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在适用于活塞螺旋桨飞机的小型空冷氢燃料 SI 发动机中，通过进气条件优化燃烧和性能参数

目的

火花点火 (SI) 发动机用于运输行业的广泛领域，从公路车辆到活塞式飞机。另一方面，SI发动机所用化石燃料储量的减少和温室气体排放的增加，使得替代燃料的使用不可避免。在本文中，在以氢气 (H ₂ ) 为燃料的小型 SI 发动机中，通过进气条件 [即进气温度、喷射正时和废气再循环 (EGR)] 优化缸内燃烧和发动机性能参数。.

设计/方法/方法

实验研究是在冲程容积为 476.5 cm ³、最大输出功率为 13 HP 和扭矩为 25 Nm的单缸风冷发动机的 1,600 rpm 发动机转速下进行的。氢燃料 SI 发动机在节气门全开 (WOT) 条件下由稀薄的空气燃料混合物 ( φ = 0.6) 运行。

发现

该论文的研究结果表明，可以在缸内燃烧、指示的发动机性能、具有最佳进气温度的排气NO _x排放、H ₂喷射的开始和 ERG 率方面实现改进。

实际影响

已经确定，32°C 的进气温度、395°C (bTDC) 的 H ₂喷射开始和 5%–10% 的 EGR 率是所检查的氢燃料 SI 发动机的最合适值。

原创价值

氢是一种可用的替代燃料，可用于从公路车辆到活塞式飞机发动机等广泛领域的 SI 发动机。然而，许多问题仍然在一定程度上限制了氢燃料 SI 发动机，例如回火、发动机功率降低和高NO _x排放。因此，检查进气条件对氢燃料 SI 发动机的缸内燃烧、发动机性能和NO _x排放参数的影响是合适的。