Optimization of the Flow in the Catalytic Converter of Internal Combustion Engines by Means of Screens

2008 ◽  
Vol 130 (5) ◽  
Author(s):  
Eduardo M. R. Arantes ◽  
Marcello A. F. Medeiros
Keyword(s):  
Pressure Drop ◽  
Service Life ◽  
Internal Combustion Engines ◽  
Catalytic Converter ◽  
Internal Combustion ◽  
Current Paper ◽  
Combustion Engines ◽  
Flow Uniformity ◽  
And Performance ◽  
Large Improvement

The flow in the automotive catalytic converter is, in general, not uniform. This significantly affects cost, service life, and performance, in particular, during cold startup. The current paper reports on a device that provided a large improvement in flow uniformity. The device is to be placed in the converter inlet diffuser and is constructed out of ordinary screens. It is cheap and easy to install. Moreover, the device does not present most of the undesired effects, such as increase in pressure drop and time to light off, often observed in other devices developed for the same purpose.

scholarly journals Experimental Research of Fibrous Materials for Two-Stage Filtration of the Intake Air of Internal Combustion Engines

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7166
Author(s):  
Tadeusz Dziubak ◽  
Leszek Bąkała ◽  
Sebastian Dominik Dziubak ◽  
Kamil Sybilski ◽  
Michał Tomaszewski
Keyword(s):  
Pressure Drop ◽  
Absorption Coefficient ◽  
Internal Combustion Engines ◽  
Filter Material ◽  
Internal Combustion ◽  
Operating Conditions ◽  
Combustion Engines ◽  
Two Stage ◽  
Stage System ◽  
Dust Absorption

Pollutant properties in intake air to internal combustion engines were analyzed. Mineral dust particles’ influence on accelerated engine components’ wear was discussed. Dust concentration values in the air under various operating conditions in trucks and special vehicles were presented. The idea and necessity for using two-stage filters, operating in a “multi-cyclone–porous partition” system for vehicles operated in dusty air conditions, are presented. Information from the literature information has been presented, showing that impurities in small grain sizes reduce fiber bed absorbency. It has been shown that such a phenomenon occurs during filter material operation, located directly behind the inertial filter (multi-cyclone), which off-road vehicles are equipped with. It results in a greater pressure drop intensity increase and a shorter proper filter operation period. It has been shown that filter material selection for the motor vehicle air filter requires knowledge of the mass of stopped dust per filtration unit area (dust absorption coefficient km) determined for a given permissible resistance value Δpfdop. It has been shown that there is no information on absorption coefficient values for filter materials operating in a two-stage “multi-cyclone–porous partition” separation system. Original methodology and conditions for determining dust absorption coefficient (km) of a separation partition, operating under the conditions of two-stage filtration, were presented. The following characteristics were tested: separation efficiency, filtration performance, and pressure drop characteristics of three different filtration partitions. These were A (cellulose), B (cellulose and polyester), and C (cellulose, polyester, and nanofibers layer), working individually and in a two-stage system—behind the cyclone. Granulometric dust composition dosed into the cyclone and cyclone downstream was determined. During tests, conditions corresponding to air filter’s actual operating conditions, including separation speed and dust concentration in the air, were maintained. For the pressure drop values, the dust absorption coefficient (km) values of three different filtration partitions (A, B, and C), working individually and in a two-stage system—behind the cyclone—were determined experimentally.

Tri-Axial Force Measurements on the Cylinder of a Motored SI Engine Operated on Lubricants of Differing Viscosity

2010 ◽  
Vol 132 (9) ◽  
Author(s):  
Bryan O’Rourke ◽  
Donald Radford ◽  
Rudolf Stanglmaier
Keyword(s):  
Axial Force ◽  
Internal Combustion Engines ◽  
Axial Direction ◽  
Internal Combustion ◽  
Mechanical Efficiency ◽  
Combustion Engines ◽  
Friction Characteristics ◽  
Colorado State University ◽  
And Performance ◽  
Lubricant Viscosity

Friction is a determining factor in the efficiency and performance of internal combustion engines. Losses in the form of friction work typically account for 10–20% of an engine’s output. Improvements in the friction characteristics of the power cylinder assembly are essential for reducing total engine friction and improving the mechanical efficiency of internal combustion engines. This paper describes the development and implementation of a new concept of the “floating liner” engine at Colorado State University that allows 0.5 crank angle deg resolved measurement of the forces on the cylinder along three axes—in the axial direction, the thrust direction, and along the wrist pin. Three different lubricants with differing properties were tested to observe the friction characteristics of each. The experimental results showed that the floating liner engine was able to resolve changes in friction characteristics coinciding with changes in lubricant viscosity and temperature. The axial force increases at TDC and BDC were observed as lubricant viscosity was decreased and larger amounts of mixed and boundary lubrication began to occur. For each test the axial friction force data was used to calculate total cycle friction work. The thrust and off-axis (wrist pin direction) forces are discussed under the same circumstances.

scholarly journals Investigation of piston ring wear engines by the mathematical statistics method

2021 ◽  
Vol 2131 (2) ◽  
pp. 022038
Author(s):  
A Khachkinayan ◽  
Yu Zharkov ◽  
V Zubkov ◽  
V Novakovich ◽  
V Ermakov
Keyword(s):  
Service Life ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Wear Intensity ◽  
Climatic Conditions ◽  
Mathematical Statistics ◽  
Combustion Engines ◽  
Piston Rings ◽  
Distribution Law ◽  
Sufficient Degree

Abstract Improving the reliability and durability of internal combustion engines makes it possible to increase productivity and reduce the cost of operation. The study of nature and magnitude of piston rings wear is relevant and represents a scientific novelty. During the operation of internal combustion engines, it is almost impossible to determine the influence of various factors on the wear rate and the resource of piston rings. One of the most accurate ways to study the wear intensity and the service life values of internal combustion engines piston rings during operation is the statistical method. The method of mathematical statistics allows us to study the nature and magnitude of individual parts wear with a sufficient degree of accuracy, to determine the main causes of wear, to outline ways of increasing the parts wear resistance, to establish durability criteria, to reasonably assign standard service life of parts and plan the parts need for any period with a given probability, with climatic conditions being taking into account. The article presents the collected statistical material on the internal combustion engines piston rings wear of construction and road vehicles operated at construction sites of Rostov region. It has been processed according to the normal Gauss law and data on the wear and service life of piston rings are obtained. The obtained experimental data on the wear of piston rings in height are reliable to the distribution law and can be used to determine the intensity of engines piston rings wear at repair enterprises.

scholarly journals Development of a virtual bench for the analysis of the physical processes of internal combustion engines

2021 ◽  
Vol 2102 (1) ◽  
pp. 012013
Author(s):  
J P Rojas Suárez ◽  
J A Pabón León ◽  
M S Orjuela Abril
Keyword(s):  
Heat Release ◽  
Fuel Consumption ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Maximum Deviation ◽  
Pressure Curve ◽  
Combustion Engines ◽  
Operating Characteristics ◽  
And Performance

Abstract Currently, internal combustion engines face the challenge of reducing fuel consumption and reducing polluting emissions due to their significant impact on the environment. Therefore, it is necessary to use tools that allow us to evaluate the operating characteristics of this type of thermal machines. In the present investigation, the development of a virtual bench was proposed for the analysis of the behavior and performance characteristics of an internal combustion engine for use as a learning tool in higher education students. From the results obtained, it could be demonstrated that the pressure curves of the combustion chamber and the rate of heat release obtained by means of the virtual bench presented a high concordance with the experimental records. The maximum deviation obtained was 5% and 15% for the pressure curve and the heat release rate. Comparing the performance parameters of the brake specific fuel consumption of the engine and energy efficiency, a maximum deviation of 2.96% was shown compared to the real engine. In general, the virtual development bank can describe the behavior of the engine, allowing the characterization of physical phenomena, as well as evaluating the effect of auxiliary technologies such as turbo-compression systems.

Tri-Axial Force Measurements on the Cylinder of a Motored SI Engine Operated on Lubricants of Differing Viscosity

2009 ◽  
Author(s):  
Bryan O’Rourke ◽  
Donald Radford ◽  
Rudolf Stanglmaier
Keyword(s):  
Axial Force ◽  
Internal Combustion Engines ◽  
Axial Direction ◽  
Internal Combustion ◽  
Mechanical Efficiency ◽  
Combustion Engines ◽  
Friction Characteristics ◽  
Colorado State University ◽  
And Performance ◽  
Lubricant Viscosity

Friction is a determining factor in the efficiency and performance of internal combustion engines. Losses in the form of friction work typically account for 10–20% of an engine’s output. Improvements in the friction characteristics of the power cylinder assembly are essential for reducing total engine friction and improving the mechanical efficiency of internal combustion engines. This paper describes the development and implementation of a new concept of the ‘floating liner’ engine at Colorado State University that allows 0.5 crank angle degree resolved measurement of the forces on the cylinder along 3 axes — in the axial direction, the thrust direction, and along the wrist pin. Three different lubricants with differing properties were tested to observe the friction characteristics of each. Experimental results showed that the floating liner engine was able to resolve changes in friction characteristics coinciding with changes in lubricant viscosity and temperature. Axial force increases at TDC and BDC were observed as lubricant viscosity was decreased and larger amounts of mixed and boundary lubrication began to occur. For each test the axial friction force data was used to calculate total cycle friction work. The thrust and off-axis (wrist pin direction) forces are discussed under the same circumstances.

Advanced Techniques for Engine Research and Design

1989 ◽  
Vol 203 (3) ◽  
pp. 169-183 ◽  
Author(s):  
C C J French
Keyword(s):  
High Speed ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Recent Past ◽  
And Performance ◽  
Research And Design ◽  
Speed Computer ◽  
Made In

This paper discusses technical improvements that have been made to internal combustion engines in the recent past. It then goes on to show that, with the availability of the high-speed computer, great possibilities exist for many more advances to be made in design and performance.

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