scholarly journals Analysis of the repeatability of fuel spray indexes in a spray-guided direct-injection spark-ignition engine

2016 ◽  
Vol 164 (1) ◽  
pp. 49-55
Author(s):  
Ireneusz PIELECHA
Keyword(s):  
Fuel Injection ◽  
Direct Injection ◽  
Combustion Process ◽  
Spark Ignition Engine ◽  
Fuel Spray ◽  
Injection Duration ◽  
Cylinder Test ◽  
Direct Injection Spark Ignition ◽  
Spray Velocity ◽  
Made In

The development and research works on liquid fuel injection in spark-ignited direct injection (SIDI) engines, apart from so common in recent years simulation methods, still have a significant cognitive substrate. This is related to experimental research on repeatability of combustion process using multi- and mono-cylinder test engines and Rapid Compression Machines. The repeatability of preparation and delivery processes has immediate impact on repeatability of combustion process. Except for the necessity of obtaining the repeatability of fuel amounts, the repeatability of injected fuel spray is required. The penetration range and spray area in combustion chamber have direct impact on mixture creation and formation. The optical research on fuel injection has been made in order to determinate its repeatability. The research on unrepeatability of fuel spray propagation has been conducted using piezoelectric injectors of outward-opening type, being primary elements of the spray-guided combustion systems. The results of research were presented in the form of index of variation of the selected parameters. The evaluation of the results of the optical research concerns radial spray penetration and fuel spray velocity. Unrepeatability has been presented with coefficient of variation of radial penetration in relation to the time of injection duration. It has been observed that the coefficients of various parameters are lower with longer times of fuel injection.

Numerical analysis of the influence of early fuel injection on charge motion in a direct injection spark ignition engine using scale-resolving simulations

2019 ◽  
Vol 21 (4) ◽  
pp. 664-682
Author(s):  
Martin Theile ◽  
Martin Reißig ◽  
Egon Hassel ◽  
Dominique Thévenin ◽  
Martin Hofer ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Flow Field ◽  
Fuel Injection ◽  
Direct Injection ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Post Processing ◽  
Charge Motion ◽  
Set Up ◽  
Direct Injection Spark Ignition

This work summarizes the numerical analysis of the effect of early fuel injection on the charge motion in a direct injection spark ignition engine concerning cyclic fluctuations of the flow field. The combination of the scale-resolving turbulence model “Scale Adaptive Simulation” and post-processing routines for vortex trajectory visualization allows for a detailed insight into the temporal resolved and cycle-dependent behavior of the charge motion. In the first part, a simplified engine set-up is presented and used as a validation case to ensure correct behavior of the turbulence model and post-processing routines. In the second part, the computational fluid dynamics model of the real engine is introduced. The application of the proposed vortex tracking algorithm is shown, and a short discussion about the transient behavior of the charge motion in this engine set-up is given. The third part describes the analysis of the influence of the fuel injection on the charge motion at different engine speeds from 1000 to 3000 r/min and variations of the intake pressure from 1 to 2 bar. Finally, the impact on different flow field properties at possible ignition timings is discussed. Changes in mean flow field quantities as well as in aerodynamic fluctuations are found as a consequence of fuel injection.

Spray Development and Wall Impingement of Ethanol and Gasoline in an Optical Direct Injection Spark Ignition Engine

2015 ◽  
Author(s):  
Mohammad Fatouraie ◽  
Margaret S. Wooldridge ◽  
Benjamin R. Petersen ◽  
Steven T. Wooldridge
Keyword(s):  
Fuel Injection ◽  
Direct Injection ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Coolant Temperature ◽  
Absolute Pressure ◽  
Injection Timing ◽  
Cylinder Wall ◽  
Wall Impingement ◽  
Direct Injection Spark Ignition

The effects of ethanol on spray development and wall impingement of a direct injection spark ignition (DISI) engine was investigated using high-speed imaging of the fuel spray in an optically-accessible engine. Neat anhydrous ethanol (E100), reference grade gasoline (E0) and a 50% blend (by volume) of gasoline and ethanol (E50) were used in the study. The experiments were conducted using continuous firing conditions for an intake manifold absolute pressure of 57 kPA, and engine speed of 1500 RPM. Retarded fuel injection timing was used (with start of injection at 250 °bTDC) to isolate the effects of cylinder wall impingement, and lean fuel-to-air ratios (ϕ=0.8–0.9) were used to minimize sooting and coating of the transparent cylinder liner. The effects of three engine coolant temperatures (25, 60 and 90 °C) and two fuel rail pressures (100 and 150 bar) on the features of the spray and the spray interaction with the wall were studied for the different fuels. Quantitative metrics were defined to analyze the spatial features of the spray related to wall impingement. Gasoline (E0) sprays exhibited higher sensitivity to coolant temperature compared to ethanol (E100) in terms of the shape of the spray and wall impingement. Higher fuel injection pressure increased the spray tip penetration rate and fuel impingement with the wall for E0 and E100, despite creating wider plume angles of the fuel sprays.

scholarly journals Simulation of liquefied petroleum gas jet in combustion chamber of spark ignition engine

2002 ◽  
Vol 24 (4) ◽  
pp. 209-218
Author(s):  
Bui Van Ga ◽  
Duong Viet Dung ◽  
Tran Van Nam
Keyword(s):  
Combustion Chamber ◽  
Direct Injection ◽  
Combustion Process ◽  
Spark Ignition ◽  
Velocity Fields ◽  
Spark Ignition Engine ◽  
Liquefied Petroleum Gas ◽  
Surrounding Environment ◽  
Mixture Preparation ◽  
Direct Injection Spark Ignition

Based on the mathematical validated by experimental data, the present paper introduces the evolution of concentration and velocity fields of Liquefield Petroleum Gas (LPG) jet in combustion chamber of spark ingnition enegine under effects of injection conditions and surrounding environment. The results allow us to predict the development of jet for an efficient organization of mixture preparation and combustion process in LPG direct injection spark ignition engine

Experimental Investigation of Two Stroke Direct Injection Spark Ignition Engine

2014 ◽  
Author(s):  
K. D. Sapate ◽  
A. N. Tikekar
Keyword(s):  
Fuel Consumption ◽  
Fuel Injection ◽  
Low Cost ◽  
Direct Injection ◽  
Weight Ratio ◽  
Spark Ignition Engine ◽  
Cylinder Block ◽  
Spark Plug ◽  
High Level ◽  
Direct Injection Spark Ignition

From its inception, the two-stroke cycle SI engine has been criticized for its high specific fuel consumption and too high level of emission of unburnt hydrocarbon (HC) and carbon monoxide (CO) during scavenging. These engines are used mainly due to its positive advantages of simplicity, low cost, higher power to weight ratio, low maintenance etc. for example, in two wheelers, outboard motor boats etc. In the present innovation, fuel is injected through injector mounted on the cylinder block facing spark plug, directly into the cylinder after closing both the inlet end exhaust port. The quantity of fuel injection is decided by developed electronic fuel injection control circuit based on two important parameters of engine namely load and speed. In this circuit, two input sensors namely throttle position sensor and speed & crank sensor is used along with developed software to control the quantity of fuel injection. After long experimentation with different locations of injector, sensors, etc., for selected two stroke engine, it has been observed that the power output has improved by 5%, reduction of fuel consumption by 20%, a reduction of HC and CO by 35% and 25% respectively, in injection mode.

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