A Quiet/Cool Exhausting Internal Combustion Engine Using a Highly Efficient, Full-Expansion Operating Cycle

1989 ◽  
Author(s):  
Frederick L. Erickson ◽  
George S. Lewis
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Operating Cycle ◽  
Highly Efficient

Experimental Research on a Three-Dimensional Journal Orbit of a Crankshaft Bearing for an Internal Combustion Engine

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Jun Sun ◽  
Xinlong Zhu ◽  
Liang Zhang ◽  
Xianyi Wang ◽  
Xiaohui Chai ◽  
...  
Keyword(s):  
Internal Combustion Engine ◽  
Cross Section ◽  
Engine Speed ◽  
Combustion Engine ◽  
Axial Direction ◽  
Internal Combustion ◽  
Operating Cycle ◽  
Axial Movement ◽  
Crankshaft Journal ◽  
The Cross

The current experimental researches on the orbit of a journal center of a crankshaft bearing for an internal combustion engine were usually focused on the 2D movement locus of a crankshaft journal center in the cross section of the bearing. However, in the actual operation of an internal combustion engine, there exists the movement of a crankshaft journal along the bearing axis under the effect of various factors, such as the crankshaft deformation acted by load. Obviously the tribological performance of a crankshaft bearing is affected inevitably by the movement of the crankshaft journal along the bearing axis. In this paper, a four-stroke four-cylinder internal combustion engine was taken as the studying object, the 3D orbit (that includes the movement in the cross section of the bearing and the movement along the bearing axis) of the journal center of the crankshaft bearing for an internal combustion engine was measured under a number of operating conditions on the test bench of an internal combustion engine. The position of the journal in the crankshaft bearing was obtained by the measurement using eddy current gap sensors and the data post-process. The results show that there exists the movement of the crankshaft journal along the axial direction in the bearing for an internal combustion engine. The actual orbit of the journal center of the crankshaft bearing for an internal combustion engine is a 3D spatial curve. The orbit of the journal center of the crankshaft bearing in one operating cycle of an internal combustion engine is not a closed curve. There is relatively a large movement of the journal along the axial direction of the crankshaft bearing, and the numerical value of the movement is greater than the radial clearance of the bearing. The greater the rotational speed of the internal combustion engine, the larger the amount of axial movement of the journal. The periodic variation exists in the axial movement of the bearing journal in one operating cycle of the internal combustion engine at low engine speed, and the varying periodicity equals the number of engine cylinders. There is no obvious varying rule of the axial movement of the bearing journal in one operating cycle of the internal combustion engine at high engine speed.

scholarly journals APLICACIÓN DE UN PROGRAMA DE CÁLCULO TÉRMICO PARA COMPROBAR EL FUNCIONAMIENTO DE UN MOTOR DIESEL PERKINS MODELO C4.236.V - GASODIESEL MEDIANTE ANÁLISIS COMPARATIVO

2017 ◽  
Vol 24 (2) ◽  
pp. 56
Author(s):  
Arturo Maza Rubina ◽  
Lastra Espinoza Luis
Keyword(s):  
Comparative Analysis ◽  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Thermal Calculation ◽  
Operating Cycle ◽  
Simulation Testing ◽  
Para Determinar ◽  
Experimental Values ◽  
Testing Bench

Este trabajo de investigación, se realizó en la ciudad de Lima y trata, sobre el desarrollo y aplicación de un programa en base al cálculo térmico; para determinar los parámetros de funcionamiento del motor de combustión interna de uso automotriz mediante la simulación de los distintos procesos que tienen lugar en los motores, los cuales permiten establecer los índices previsibles del ciclo de funcionamiento de un motor de combustión interna de tipo gasodiesel (GLP+D2). El desenvolvimiento del cálculo térmico, con respecto al comportamiento del motor trabajando como gasodiesel, es validado y contrastado con los valores experimentales, mediante un análisis comparativo de las características del motor Diesel Perkins, obtenidas en el banco de pruebas Newage y las características del motor simuladas; mediante el programa computacional AJESA 2004, luego se realiza la contrastación de cada subhipótesis permitiendo así la formulación de conclusiones. Palabras clave.- Gasodiesel, Cálculo térmico, Simulación, Banco de pruebas, Ajesa 2004, Newage, Válvula RND, Características de velocidad, Características de carga, Análisis comparativo. ABSTRACTThis research was conducted in Lima and is on the development and implementation of a program based on thermal calculation; to determine the operating parameters of an internal combustion engine for automotive use, by simulating various processes occurring in engines, which allow to establish the expected rate of the operating cycle of an internal combustion engine of gasodiesel type (GLP + D2). The development of the thermal calculation, based on the behavior of the engine working as gasodiesel, is validated and contrasted with the experimental values, through a comparative analysis of the characteristics of the diesel engine Perkins, obtained in the test Newage and simulated characteristics of the engine; by the computer program AJESA 2004, finally each sub-hypothesis is tested and this allows us to formulate conclusions. Keywords.- Gasodiesel, Thermal calculation, Simulation, Testing bench, Ajesa 2004, Newage, RND valve, Speed characteristics, Load characteristics, Comparative analysis.

scholarly journals PULSE JET INTERNAL COMBUSTION ENGINE

2019 ◽  
Author(s):  
Tim Walshaw
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Circular Motion ◽  
Liquid Fuels ◽  
Light Weight ◽  
Piston Engine ◽  
Jet Engine ◽  
Highly Efficient ◽  
Pulse Jet

This article describes using the pulse jet to create circular motion. Such an engine would be highly efficient, simple and cheap to build, light weight, and could use a wide variety of liquid fuels. Such a pulse jet engine would be a very efficient substitute for the piston engine.

АКУСТИЧНА ПОМІТНІСТЬ БЕЗПІЛОТНИХ ЛІТАЛЬНИХ АПАРАТІВ З СИЛОВИМИ УСТАНОВКАМИ НА БАЗІ ПОРШНЕВИХ ДВИГУНІВ

2020 ◽  
pp. 62-80
Author(s):  
В. В. Руденко ◽  
И. В. Калужинов ◽  
Н. А. Андрущенко
Keyword(s):  
Control System ◽  
Internal Combustion Engine ◽  
Power Plants ◽  
Combustion Engine ◽  
Spectral Characteristics ◽  
Experimental Studies ◽  
Internal Combustion ◽  
Detection Range ◽  
Acoustic Signature ◽  
Static Conditions

The presence in operation of many prototypes of UAVs with propeller propellers, the use of such devices at relatively low altitudes and flight speeds makes the problem of noise reduction from UAVs urgent both from the point of view of acoustic imperceptibility and ecology.The aim of the work is to determine a set of methods that help to reduce the visibility of UAVs in the acoustic range. It is shown that the main source of noise from the UAV on the ground is the power plant, which includes the engine and the propeller. The parameters of the power plants influencing the processes that determine the acoustic signature of the UAV were investigated. A comprehensive analysis of the factors affecting visibility was carried out. The power plants include two-stroke and four-stroke engines, internal combustion and two-blade propellers. The use of silencers on the exhaust of the internal combustion engine was considered. The spectral characteristics of the acoustic fields of the propeller-driven power plants for the operating sample of the UAV "Eco" were obtained. The measurements were carried out in one-third octave and 1/48 octave frequency bands under static conditions. The venue is the KhAI airfield. Note that the propellers that were part of the power plants operated at Reynolds numbers (Re0,75<2*105), which can significantly affect its aerodynamic and acoustic characteristics. It is shown that when choosing a UAV control system, one should take into account the fact that two-stroke piston engines are the dominant source in the noise of propeller-driven control systems in the absence of a hood and mufflers in the intake and exhaust tracts. The use of a four-stroke internal combustion engine significantly reduces the noise of the control system. In the general case, the position of the boundaries of the zone of acoustic visibility of a UAV at the location of the observer is determined by the ratio between the intensity of acoustic radiation perceived by the observer from the UAV and the intensity of sound corresponding to the natural acoustic background and depends on the degree of manifestation of acoustic effects accompanying the propagation of sound in a turbulent atmosphere - the refraction of sound waves. Absorption and dissipation of acoustic energy. The calculation and comparison of the UAV detection range was carried out taking into account the existing natural maskers.The results of experimental studies are presented that allow assessing the degree of acoustic signature of the UAV. A set of measures aimed at reducing the intensity of the acoustic signature of the UAV in various regions of the radiation spectrum has been determined.

Sign in / Sign up

Export Citation Format

Share Document