scholarly journals Development of a Two-Stroke Cycle Engine for Use in the Agricultural Aviation Sector

2020 ◽  
pp. 52-61
Author(s):  
Samara Herrmann ◽  
Macklini Dalla Nora ◽  
Thompson Diordinis Metzka Lanzanova
Keyword(s):  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Low Cost ◽  
Short Circuit ◽  
Fuel Mixture ◽  
Large Power ◽  
Valve Overlap ◽  
Direct Fuel Injection ◽  
Stroke Engine ◽  
Stroke Cycle

Reciprocating internal combustion engines have wide application in agricultural, recreational and experimental aircraft, resulting from their low cost and less complex maintenance compared to other engines. Thus, this work analyzed the performance of a conventional four-stroke engine operating in the two-stroke cycle by means of direct fuel injection and mechanical air supercharging. The use of a supercharger was essential in this design to provide adequate gas exchange inside the cylinder during the long valve overlap required, while direct fuel injection made it possible to reduce the short circuit of air-fuel mixture to the exhaust. Due to the double ignition frequency compared to a four-stroke engine, it was possible to obtain a large power density (40 kW/L) at a speed of 2400 rpm, also a specific fuel consumption of 270 g/kWh with gasoline and 400 g/kWh with ethanol. The use of ethanol in replacement of gasoline made it possible to operate at full load (160 Nm/L) at 800 rpm without the occurrence of knocking combustion.

Developments in Two-Stroke Cycle Engine Exhaust Emissions

1992 ◽  
Vol 206 (2) ◽  
pp. 93-106 ◽  
Author(s):  
R G Kenny
Keyword(s):  
High Performance ◽  
Fuel Injection ◽  
Low Cost ◽  
Exhaust Emissions ◽  
Spark Ignition Engines ◽  
Engine Exhaust ◽  
Wide Range ◽  
Direct Fuel Injection ◽  
Stroke Engine ◽  
Stroke Cycle

This paper is concerned with the exhaust emissions from two-stroke cycle spark ignition engines and the means being investigated to reduce them. The simple two-stroke engine has inherently low levels of NOx emissions and high levels of hydrocarbon emissions. The reasons for these emissions characteristics are explained by reference to the open literature. The two-stroke engine is used in a wide range of applications including low-cost, low-output mopeds and high-performance motorcycles. More recently there has been a resurgence of interest in the two-stroke as an alternative to the four-stroke engine for automotive use. A number of the recently reported approaches to emissions control are reviewed, including the use of exhaust oxidation catalysts in simple low-cost engines and direct fuel injection on more costly, multi-cylinder engines.

scholarly journals A Study of Direct Fuel-Injection Two-Stroke Cycle Methanol Engine.

1991 ◽  
Vol 57 (539) ◽  
pp. 2442-2448
Author(s):  
Shuicci KAJITANI ◽  
Norihiro SAWA ◽  
Shigenobu HAYASHI ◽  
Yuzuru KUBOTA
Keyword(s):  
Fuel Injection ◽  
Direct Fuel Injection ◽  
Stroke Cycle

Optimizing the Quantity of Diesel Fuel Injection by Using 25HHOCNG Gas Fuel Mixture

2015 ◽  
Vol 14 ◽  
pp. 36-45 ◽  
Author(s):  
Hüseyi̇n Turan Arat ◽  
Mustafa Kaan Baltacioğlu ◽  
Mustafa Özcanli ◽  
Kadir Aydın
Keyword(s):  
Diesel Fuel ◽  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Combustion Process ◽  
Fuel Mixture ◽  
Injection Technique ◽  
Fuel Pump ◽  
Pump Plunger ◽  
Fuel Mixtures ◽  
Diesel Fuel Injection

Injection behaviors of internal combustion engines are very substantial fact that provides developments to future strategies about optimizing the engine and fuel parameters. During the combustion process, pilot diesel injection technique is more preferable option while using alternative gas fuels in a diesel engine. In this experimental study, a 3.6 L commercial, four stroke, four cylinders and mechanical fuel pump non-modified diesel test engine operated with hydroxy (HHO) and compressed natural gas (CNG) fuel mixtures under 25% and 75% (vol/vol), respectively. Diesel fuel injection quantities were reduced with the help of steeping motor devices which mounted on mechanical fuel pump plunger pin. Sensitive removes of steeping motor, plunger pin twisted clockwise 360°, 720° and 1080°, respectively. Comparisons of engine performance and exhaust emissions were explained briefly and illustrated via graphs. As a result, 720° clockwise twisted pin is the optimum point for experimental fuel pump plunger while using 25HHOCNG fuel mixtures.

scholarly journals SI engine fuel mixture type indicator and an assessment of its suitability of an economic driving style

2021 ◽  
Author(s):  
Zbigniew Wołczyński ◽  
Mikołaj Żak
Keyword(s):  
Urban Areas ◽  
Fuel Injection ◽  
Fuel Mixture ◽  
Spark Ignition Engine ◽  
Engine Fuel ◽  
Driving Style ◽  
Correct Operation ◽  
Type Indicator ◽  
Noticeable Reduction ◽  
Direct Fuel Injection

The article presents the structure and a principle of operation of a simple indicator of the type of a fuel-air mixture supplying a spark-ignition engine with a direct fuel injection. The designed indicator was tested, as a result of which its correct operation was verified. By using information from the indicator, it was possible to assess its usefulness for assisting the driver in an economical driving style. Preliminary studies show that thanks to the use of the developed indicator, it is possible to save about 10% of fuel as a result of the correction of the economic driving style on the route selected for the purpose of this research paper. The target of this study was to confirm a noticeable reduction in fuel consumption when supplying the engine with a stratified mixture. In order to obtain more accurate data, the research should be extended to include a greater number of routes and its division into urban and non-urban areas.

scholarly journals A research into a gasoline HCCI engine

2010 ◽  
Vol 140 (1) ◽  
pp. 3-13
Author(s):  
Jacek HUNICZ ◽  
Andrzej NIEWCZAS ◽  
Paweł KORDOS
Keyword(s):  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Injection Timing ◽  
Exhaust Gas ◽  
Combustion Engines ◽  
Hcci Combustion ◽  
Permissible Range ◽  
Wide Range ◽  
Gas Recirculation ◽  
Direct Fuel Injection

Homogeneous charge compression ignition (HCCI) is nowadays a leading trend in the development of gasoline internal combustion engines. The application of this novel combustion system will allow to comply with future legislations concerning the exhaust emissions including carbon dioxide. This paper presents a design and implementation of a research engine with a direct fuel injection and the capability of HCCI combustion via an internal gas recirculation and a negative valves overlap (NVO). The technical approach used in the engine allowed an autonomous HCCI operation at variable loads and engine speeds without the need of a spark discharge. Experiments were conducted at a wide range of valve timings providing data which allowed an assessment of a volumetric efficiency and exhaust gas recirculation (EGR) rate. Permissible range of air excess coefficient, providing stable and repeatable operation has also been identified. The use of direct gasoline injection benefited in the improvement of the start of the combustion (SOC) and heat release rate control via the injection timing.

scholarly journals Numerical investigation into the effect of direct fuel injection on thermal stratification in HCCI engine

2017 ◽  
Vol 169 (2) ◽  
pp. 137-140
Author(s):  
Michał GĘCA ◽  
Jacek HUNICZ ◽  
Piotr JAWORSKI
Keyword(s):  
Combustion Chamber ◽  
Thermal Stratification ◽  
Fuel Injection ◽  
Injection Timing ◽  
Ignition Timing ◽  
Hcci Engine ◽  
Auto Ignition ◽  
Negative Valve Overlap ◽  
Valve Overlap ◽  
Direct Fuel Injection

Despite the fact that HCCI engines are distinguished by mixture homogeneity, some degree of stratification always appears inside a combustion chamber. It is especially applied to residual effect engines utilizing negative valve overlap. Mixture stratification is a result of the imperfect mixing of fresh air with trapped residuals. Direct fuel injection introduces stratification as well, due to fuel vaporization. As a consequence, the temperature within the combustion chamber is uneven. Thermal stratification affects auto-ignition timing and combustion evolution in a high extent. The purpose of this study was to evaluate a degree of thermal stratification in HCCI engine utilizing negative valve overlap. Investigations were performed using three-dimensional CFD model of the combustion system, made by using AVL FIRE software. Simulations were realized for various timings of fuel injection into the cylinder. It was found that fuel injection timing had a significant effect on the thermal stratification and resulting auto-ignition timing.

scholarly journals NUMERICAL ANALYSIS OF THE AIR-FUEL MIXTURE IN INDIRECT AND DIRECT INJECTION OF FOUR-STROKE ENGINES

2019 ◽  
Vol 18 (2) ◽  
pp. 89
Author(s):  
G. G. Narcizo ◽  
D. A. Miranda
Keyword(s):  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Direct Injection ◽  
Fuel Mixture ◽  
Combustion Efficiency ◽  
Simulation Software ◽  
Injection System ◽  
Scholarly Work ◽  
Ansys Fluent ◽  
Dynamics Simulations

The quality of the air-fuel mixture in internal combustion engines directly affects the combustion efficiency, therefore a good design of the combustion chamber combined with the correct fuel injection system, can provide a better use of this mixture and increase the efficiency of the engine. Considering these aspects, this scholarly work presents a comparative study of the indirect injection system and direct fuel injection, analyzing the way the mixture behaves in these two conditions. For this, the Ansys Fluent simulation software was used, in which were applied computational fluid dynamics simulations of the air-fuel mixture. The objective of this scholarly work is to contribute to the development of the injection systems, enabling the improvement of new studies and developments of new nozzle models can be performed.

Sign in / Sign up

Export Citation Format

Share Document