Influence of Intake Port Charge-Motion-Control-Valve on Mixture Preparation in a Port-Fuel-Injection Engine

2007 ◽  
Author(s):  
Robert J. Scaringe ◽  
Wai K. Cheng
Keyword(s):  
Motion Control ◽  
Fuel Injection ◽  
Control Valve ◽  
Intake Port ◽  
Charge Motion ◽  
Port Fuel Injection ◽  
Mixture Preparation

scholarly journals Performance and Emission Characteristics of Homogeneous Charge Compression Ignition Engine with Different Bio Diesel Fuels

2018 ◽  
Vol 7 (4.24) ◽  
pp. 157 ◽  
Author(s):  
P Moulali ◽  
T H Prasad ◽  
B D Prasad
Keyword(s):  
Homogeneous Charge Compression Ignition ◽  
Fuel Injection ◽  
Emission Characteristics ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Hcci Engine ◽  
Diesel Fuels ◽  
Port Fuel Injection ◽  
Mixture Preparation ◽  
Algae Oil

In this paper the emission characteristics and performance of various bio diesel fuels (Tyre pyrolysis oil (TPO), Micro algae oil and Pig animal fat oil) were experimented. A single cylinder, water cooled diesel engine was modified in to homogeneous charge compression ignition engine (HCCI) with adopted port fuel injection (PFI) technique. The effects of air fuel ratio, intake temperature, injection pressure and EGR rate exhaust emissions were explained in a broad manner. The analysis of the exhaust emissions are integrated to oxides of Nitrogen (NOx), Carbon Monoxide (CO), unburned hydro carbons (UHC), smoke and soot. The performance analysis was also included on specific fuel consumption and break thermal efficiency. The basic requirements for HCCI engine is the homogeneous mixture preparation of air and fuel. This mixture formation was done by adopting port fuel injection technique and external devices were also used for bio diesel vaporization and mixture preparation. The combustion processes were measured with different EGR system.  The experimental results of different bio diesel fuels with HCCI engine mode were recorded and evaluated. A small increase in CO and HC emissions were observed with increasing bio diesel content due to slow evaporation rate of bio diesel. A significant reduction in NOx emission was also observed with respect to difference in bio diesel blends. Micro algae oil was found more stable compared with other bio diesel fuels due to the property of fuel vaporization and low heat releasing.

Evaluating the Influence of Charge Motion Control on In-Cylinder Flow Using MTV

2008 ◽  
Author(s):  
M. Mittal ◽  
H. J. Schock ◽  
R. Sadr
Keyword(s):  
Velocity Field ◽  
Motion Control ◽  
Combustion Process ◽  
Control Valve ◽  
Multiple Point ◽  
Charge Motion ◽  
Ic Engine ◽  
Molecular Tagging Velocimetry ◽  
Air Mixing ◽  
Cylinder Flow

An experimental study is performed to investigate the effects of charge motion control on flow measurement inside an internal combustion (IC) engine assembly. Molecular Tagging Velocimetry (MTV) is used to obtain the multiple point measurement of the instantaneous velocity field. MTV is a molecular counterpart of PIV based techniques, and it eliminates the use of seed particles. A two-dimensional velocity field is obtained at various crank angle degrees (CADs) for tumble and swirl measurement planes inside an optical engine assembly [1500 and 2500 rpm engine speeds]. Effects of charge motion control are studied considering different cases of: (i) Charge motion control valve (CMCV) deactivated and (ii) CMCV activated. Both the measurement planes are used in each case to study the cycle-to-cycle variability inside an engine cylinder. Probability density functions (PDFs) of the normalized circulation (NC) are calculated from the instantaneous planar velocity to quantify the cycle-to-cycle variations of in-cylinder flows. Different geometries of CMCV produce different effects on the in-cylinder flow field. It is found that the CMCV used in this work has a profound effect on fuel-air mixing; however, its influence is not as significant during the late compression. Therefore, it can be assumed that CMCV has less contribution to enhance the flame speed during the combustion process.

Influence of Injection Angle and Valve Opening Manner on Mixing Performance in a Large-Bore Port Fuel Injection Compressed Natural Gas-Fueled Engine

2016 ◽  
Vol 138 (12) ◽  
Author(s):  
Tianbo Wang ◽  
Siqin Chang ◽  
Liang Liu
Keyword(s):  
Natural Gas ◽  
Fuel Injection ◽  
Ignition Time ◽  
Intake Port ◽  
Compressed Natural Gas ◽  
Injection Angle ◽  
Mixing Performance ◽  
Port Fuel Injection ◽  
Poppet Valve ◽  
Valve Opening

One new kind of gas injection devices (GIDs), with moving-coil electromagnetic linear actuator (MCELA) and mushroom-type poppet valve, was projected to inject sufficient compressed natural gas (CNG) to a large-bore port fuel injection (PFI) engine. It had larger mass flow rate and better controllability than conventional GID. And the transient computational fluid dynamics (CFD) engine model incorporating the GID's motion was established to analyze the effects of the GID injection angle and poppet valve opening manner on the mixing homogeneity in the intake port, and finally, the in-cylinder mixing performance and gas movement intensity were compared. The results indicate that with the increasing of injection angle, the mixing homogeneity in the near-field injection location of intake port will be better, and the time when fuel starts to get into cylinder will be later. At ignition time, the injection angles 60 deg, 90 deg, and 120 deg show better in-cylinder mixing performance, while 150 deg has the worst. The pull-open GID injects more momentum to the intake port than the push-open one, and the mixing degree both in the intake port and cylinder is higher.

scholarly journals Performance, Efficiency and Emissions Evaluation of Gasoline Port-Fuel Injection, Natural Gas Direct Injection and Blended Operation

2016 ◽  
Author(s):  
Michael Pamminger ◽  
Thomas Wallner ◽  
James Sevik ◽  
Riccardo Scarcelli ◽  
Carrie Hall ◽  
...  
Keyword(s):  
Natural Gas ◽  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Direct Injection ◽  
Combustion Process ◽  
Internal Combustion ◽  
Intake Port ◽  
Combustion Engines ◽  
Part Load ◽  
Port Fuel Injection

The need to further reduce fuel consumption and decrease the output of emissions — in order to be within future emissions legislation — is still an ongoing effort for the development of internal combustion engines. Natural gas is a fossil fuel which is comprised mostly of methane and makes it very attractive for use in internal combustion engines because of its higher knock resistance and higher molar hydrogen-to-carbon ratio compared to gasoline. The current paper compares the combustion and emissions behavior of the test engine being operated on either a representative U.S. market gasoline or natural gas. Moreover, specific in-cylinder blend ratios with gasoline and natural gas were also investigated at part-load and wide open throttle conditions. The dilution tolerance for part-load operation was investigated by adding cooled exhaust gas recirculation. The engine used for these investigations was a single cylinder research engine for light duty application which is equipped with two separate fuel systems. Gasoline was injected into the intake port; natural gas was injected directly into the cylinder to overcome the power density loss usually connected with port fuel injection of natural gas. Injecting natural gas directly into the cylinder reduced both ignition delay and combustion duration of the combustion process compared to the injection of gasoline into the intake port. Injecting natural gas and gasoline simultaneously resulted in a higher dilution tolerance compared to operation on one of the fuels alone. Significantly higher net indicated mean effective pressure and indicated thermal efficiency were achieved when natural gas was directly injected after intake valve closing at wide open throttle, compared to an injection while the intake valves were still open. In general it was shown that the blend ratio and the start of injection need to be varied depending on load and dilution level in order to operate the engine with the highest efficiency or highest load.

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