scholarly journals Initial tightening of a cylinder head assembly on a marine engine block

2020 ◽  
Vol XXIII (1) ◽  
pp. 66-75
Author(s):  
Mihaela Turof
Keyword(s):  
Cylinder Head ◽  
Internal Combustion Engines ◽  
The Other ◽  
Engine Block ◽  
Combustion Engines ◽  
Head Assembly ◽  
Intermediate Solution ◽  
Number Of Cycles ◽  
Combustion Processes ◽  
Stroke Engine

When attaching the cylinder head to the engine block, to internal combustion engines, the force with which the mounting screws are tightened is of particular importance (in case of too tight a tightening the screws may break, and in the case of too small tightening the fluid may leave the container due to removal. the flanges one to the other). In the case of slow, high-power engines, the engine block is individual, containing a single cylinder shirt. The intermediate solution of the engine block for a group of cylinders is also used. The two-stroke engine chops are more strongly heat demanded, due to the doubling of the number of cycles in the unit of time, respectively by combustion processes in the unit of time. Requesting the cylinder head bolts and other components of the assembly by force due to the pressure developed during the process of gas exchange and combustion in the engine cylinders is a demand with a pulsating character.

scholarly journals The Effect of Pure Oxygenated Biofuels on Efficiency and Emissions in a Gasoline Optimised DISI Engine

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3908
Author(s):  
Tara Larsson ◽  
Senthil Krishnan Mahendar ◽  
Anders Christiansen-Erlandsson ◽  
Ulf Olofsson
Keyword(s):  
Internal Combustion Engines ◽  
Negative Impact ◽  
The Other ◽  
Nox Emissions ◽  
Combustion Engines ◽  
Engine Efficiency ◽  
Spark Timing ◽  
Low Load ◽  
Oxygenated Fuels ◽  
Load Conditions

The negative impact of transport on climate has led to incentives to increase the amount of renewable fuels used in internal combustion engines (ICEs). Oxygenated, liquid biofuels are promising alternatives, as they exhibit similar combustion behaviour to gasoline. In this article, the effect of the different biofuels on engine efficiency, combustion propagation and emissions of a gasoline-optimised direct injected spark ignited (DISI) engine were evaluated through engine experiments. The experiments were performed without any engine hardware modifications. The investigated fuels are gasoline, four alcohols (methanol, ethanol, n-butanol and iso-butanol) and one ether (MTBE). All fuels were tested at two speed sweeps at low and mid load conditions, and a spark timing sweep at low load conditions. The oxygenated biofuels exhibit increased efficiencies, even at non-knock-limited conditions. At lower loads, the oxygenated fuels decrease CO, HC and NOx emissions. However, at mid load conditions, decreased volatility of the alcohols leads to increased emissions due to fuel impingement effects. Methanol exhibited the highest efficiencies and significantly increased burn rates compared to the other fuels. Gasoline exhibited the lowest level of PN and PM emissions. N-butanol and iso-butanol show significantly increased levels of particle emissions compared to the other fuels.

scholarly journals Analysis of thermodynamic parameters in spark ignition VCR engine

2019 ◽  
Vol 294 ◽  
pp. 05001
Author(s):  
Patryk Urbański ◽  
Maciej Bajerlein ◽  
Jerzy Merkisz ◽  
Andrzej Ziółkowski ◽  
Dawid Gallas
Keyword(s):  
Thermodynamic Parameters ◽  
Motion Analysis ◽  
Internal Combustion Engines ◽  
Initial Conditions ◽  
Combustion Process ◽  
Internal Combustion ◽  
3D Models ◽  
Spark Ignition ◽  
Combustion Engines ◽  
Combustion Processes

3D models of Szymkowiak and conventional engines were created in the Solidworks program. During the motion analysis, the characteristics of the piston path were analyzed for the two considered engine units. The imported file with the generated piston routes was used in the AVL Fire program, which simulated combustion processes in the two engines with identical initial conditions. The configurations for two different compression ratios were taken into account. The basic thermodynamic parameters occurring during the combustion process in internal combustion engines were analyzed.

Thermo-Fluid Analysis of the Exhaust Manifold Integrated With Cylinder Head

2012 ◽  
Author(s):  
Mohammad Amin Neshan ◽  
Ali Keshavarz ◽  
Ali Jazayeri ◽  
Ali Ghasemian
Keyword(s):  
Cast Iron ◽  
Thermal Resistance ◽  
Cylinder Head ◽  
Internal Combustion Engines ◽  
Low Cost ◽  
Combustion Engines ◽  
Exhaust Manifold ◽  
Warm Up ◽  
Fluid Analysis ◽  
Temperature Limitation

Exhaust manifold is an individual part of conventional internal combustion engines which is made of cast iron. Furthermore expensive alloys are needed to increase its thermal resistance. In the Integrated Exhaust Manifold into Cylinder Head (IEMCH), the exhaust manifold is manufactured as one part with the cylinder head. Thus its material changes from cast iron to aluminum which has a much lower thermal resistance than the cast iron. IEMCH has many advantages such as, low cost, lower weight and volume, less fuel consumption and faster warm-up. But due to its lower thermal resistance, it must be cooled. Here a new exhaust manifold is designed for IEMCH. Thermo-fluid analysis is carried out numerically to evaluate temperature limitation of the new exhaust manifold. The obtained results are compared to the standard exhaust manifold which indicates that by means of cooling, the new exhaust manifold can be remained at its proper temperature limitation. Thus no expensive alloys are needed in the new exhaust manifold.

scholarly journals Simulation Study on the Potential of Braided Hose Failure in Internal Combustion Engines

2018 ◽  
Vol 225 ◽  
pp. 02017 ◽  
Author(s):  
S. Hassan ◽  
S. Afdhal ◽  
M. Shahrizal ◽  
A. Eleena
Keyword(s):  
Stress Distribution ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
The Other ◽  
Combustion Engines ◽  
Analysis Method ◽  
Pressure Loading ◽  
Working Pressure ◽  
Cyclic Pressure ◽  
Causes Of Failure

In this study, damaged braided hoses was obtained from the actual site to investigate the possible causes of failure in the internal combustion engines. The hoses were assembled with polytetrafluroethylene (PTFE) as the inner tube and externally braided outer tube corrosionresistant steel (CRES). The hose had undergone failures near the end of the fittings. The braided hose was measured and modelled using SOLIDWORKS CAD software. The ANSYS static structural stimulation was used to measure the stress distribution on the hose due to pressure applied with various bend shapes. The simulation was done by fixing the end of the pipe and exerting the working pressure inside the inner layer of PTFE. The results of the simulation have shown that the inner tube experienced high stresses near the fittings which is then aggravated with the bending. With cyclic pressure loading, the hose was unable to stand the high stresses near the fittings and therefore failed. Further analyses were done to the braided hose to investigate the other possible of failure using failure analysis method.

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