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1
Content available Hydrodynamics of the injection equipment
Hlavna V., Toporcer E.
Silniki Spalinowe
|
2011
|
R. 50, nr 3
EN
An additional expansion of fuel from the area under the nozzle needle seat into the combustion space considerably influences HC, CO and PM formation. The mentioned expansion can be limited by the injection process optimization. One element of the fuel system playing a significant role in the injection process - its hydrodynamics, is a delivery valve of the injection pump fulfilling also the role of relieving the high-pressure area. The paper deals with hydrodynamics of the injection equipment with a multi-cylinder injection pump. Achieved results serve as input parameters for a subsequent model and experimental solution of the influence of observed parameters on economic and ecological parameters of diesel engines.
2
Content available Flow modeling in an intercooler
Toporcer E.
Silniki Spalinowe
|
2011
|
R. 50, nr 3
EN
The paper deals with the numerical modeling of charging air flow and cooling air flow in a charge air intercooler. The intercooler is air/air type and is used for the four stroke compression ignition engine with the total displacement of 7,6 l. The CATIA - CAD (Computer Aided Design) software is used for modeling of the 3D space geometrical model of the intercooler. The preprocessor Gambit is used for the creating of the needed computational mesh and the Fluent - CFD (Computational Fluid Dynamics) software is then used for the simulation itself and the postprocessing. The charge air flow in the intercooler is evaluated through the simulation results. Consequently the places with the maximum values of the velocity magnitudes for the charging air flow and the cooling air flow can be found. The simulation shows that the maximum value of velocity magnitude for the charging air flow is in the area of the intercooler inlet. The maximum value of velocity between the cooling fins is found through the simulation. Through this the information for the optimization of the intercooler can be gained. The purpose of the simulation is to use the low temperatures of charging to obtain more effective energy utilization, the decrease of the environment ecological load compared with the standard solution.
3
Content available Exhaust gases measurement preparation
Toporcer E.
Journal of KONES
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2011
|
Vol. 18, No. 2
419-426
EN
The paper deals with the measurement preparation for the exhaust gases measurement. The measurement is carried out within the project of basic research. The aim of the project is the research of the influence of an unconventional charging intercooling on the selected ecological and economical parameters of a turbocharged compression ignition internal combustion engine in the specific operational conditions. The paper gives the information about the types, numbers, specification and position of the sensors used. The measuring scheme with the connection of sensors and connector blocks is also shown. The details about the single parts of the measuring chain are given. The paper also shows the view on the sensors through the photographs. Some results from a testing measurement are also shown and the results from the selected sensors can be compared. The two different intercoolers are used for charging air cooling. The first intercooler is the air/air type equipped with a ventilator, the second intercooler is the water/air type without a ventilator. The total displacement of an engine is 7.61. The measurement itself is aimed mainly to acquire information regarding the influence of the low temperatures of charging on the amount of NOx. Also the influence on the amount of particulate matter is examined through the mentioned measurement.
4
Content available Optimization of a nonconventional engine evaporator
Kovalčik A., Toporcer E.
Journal of KONES
|
2010
|
Vol. 17, No. 2
217-223
EN
The papers deal with the optimization of the evaporator of a nonconventional combustion engine. Lithium bromide liquid (LiBr - an alternative cooling medium) flows in a cooling circuit of a nonconventional energetic unit. The solved energetic system is defined in the area of trigeneration systems. The mentioned system is a source of electric energy, cold and heat too. The space geometrical model corresponding to the geometry of the original evaporator is created in the CAD (Computer Aided Design) software CATIA. Only one half of the evaporator is created because of the decrease in the demand on the computational means. This CAD model is then imported into the preprocessor Gambit. The imported model is repaired and a suitable mesh is then created. The last step is the definition of the types of boundary conditions. The completed computational mesh is then exported from Gambit and imported into the CFD (Computational Fluid Dynamics) software Fluent. Fluent is used for the numerical simulation of the cooling medium flow in an evaporator. The simulation shows the filling of the evaporator cone, the time when the cooling medium starts to pour through the edge of the evaporator cone, the filling of the evaporator ring and finally also the fact that the off-take is able to take away the needed amount of cooling liquid from the evaporator.
5
Content available Intercooler for extremely low temperatures of charging
Toporcer E., Tučnik P., Cisek J.
Journal of KONES
|
2010
|
Vol. 17, No. 4
529-536
EN
The paper deals with the optimization of the charge air intercooler of the turbocharged internal combustion engine with the focus on the extremely low temperatures of charge air. The software Fluent is used for the numerical simulation (CFD - Computational Fluid Dynamics) of the charge air flow. The 3 D space geometrical model of the charge air intercooler is created in the CAD (Computer Aided Design) software CATIA. The model is simplifled according to the requirements of the computational mesh creation and numerical simulation. The model is then exported as the iges file and this file is subsequently imported into the preprocessor Gambit. The imported model is repaired and a suitable mesh is then created according to the computational means properties. The last step is the definition of the types of boundary conditions. The needed types of boundary conditions are applied to the single surfaces and volumes. The completed computational mesh is then exported from Gambit and imported into the CFD software Fluent for numerical simulation. The needed values of parameters are used for the calculation definition and the simulation is started. The simulation results show the charge air flow in the charge air cooler and the places with the maximum values of turbulences can be found and this information can be the input for the optimization design of the mentioned cooler.
6
Content available remote Modeling of flow in an evaporator of a nonconventional combustion engine
Hlavna V, Kovalcik A, Toporcer E
Silniki Spalinowe
|
2009
|
R. 48, SC1
79--85
EN
A nonconventional cooling-combustion engine uses the part of energy bound in a cooling system of a combustion engine for production of the cooling output applicable in motor vehicles. We have given some information about the principle and some other details at preceding conferences. The paper deals with a flow simulation of the working medium in the vaporization container of a cooling circuit of the unconventional combustion engine. Consequently evaporation and thermal states at the atmospheric pressure above the unconventional cooling liquid (solution LiBr – H2O) level in the evaporator are simulated. Limiting conditions for the functionality assurance of the cooling system of the unconventional combustion engine were found by means of a simulation.
7
Content available Vehicle braking parameters influencing factors
Labuda R., Toporcer E., Hlavńa V.
Journal of KONES
|
2009
|
Vol. 16, No. 4
257-264
EN
In automotive technology attributes of the "driver-vehicle-environment" system are described as "vehicle handling". The driver has control of the vehicle generally by means of directional guidance, acceleration and braking, on the other side different influences as are side wind, road irregularities, road profile, sudden obstructions etc.from the environment affect on the vehicle. The task of research and development in the field of vehicle control is to adjust the vehicle handling to the driving ability of an average driver so that the active safety of the vehicle and passengers maximizes. Some selected vehicle characteristics and relations which influence the vehicle dynamics in braking modes are analysed in the paper. In particular vehicle influencing forces at braking, slip curve of the wheel, velocity course at braking, simplified parameters course, measurement preparation, measurement from the initial velocity ni =90 km.h-1, maximum braking deceleration dependence on tire pressure and velocity ni 1 on dry surface, maximum braking deceleration dependency on tire pressure and velocity ni 1 on wet surface, maximum braking deceleration dependency on velocity ni 1 tire pressure on dry surface, Maximum braking deceleration dependency on velocity ni 1nd tire pressure on wet surface are presented in the paper.
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