scholarly journals Differential equations for calculating gas exchange in an internal combustion engine

2021 ◽  
Vol 264 ◽  
pp. 01003
Author(s):  
Zakirjon Musabekov ◽  
Jamshid Khakimov ◽  
Ergashev Botir
Keyword(s):  
Pressure Drop ◽  
Gas Exchange ◽  
Internal Combustion Engine ◽  
Flow Rate ◽  
Combustion Engine ◽  
Flow Characteristics ◽  
Maximum Flow ◽  
Internal Combustion ◽  
Dimensional Model ◽  
Short Period

Considering the unsteadiness of the flow in the valve channels and windows of the internal combustion engine in combination with limiting the maximum flow rate allows you to take into account the flow characteristics in the exhaust systems of forced engines. Thus, the calculation according to the above method allows us to obtain by calculation, observed in experiments, the reverse pressure drop in the short period of the end of the free release, the validity of using a modified 0-dimensional model of gas exchange, even for engines with long manifolds, where the Strophe number is less than 8.

Analysis of Biodiesel Spray Combustion in Internal-Combustion Engine using Multidimensional Models

2021 ◽  
Vol 13 (4) ◽  
Author(s):  
Qiuyu Zheng ◽  
Xu Wang ◽  
Yi Liu ◽  
Feng Jiang ◽  
Tianqi Liu
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Phase Control ◽  
Combustion Characteristics ◽  
Liquid Fuels ◽  
Spray Combustion ◽  
Dimensional Model ◽  
Fuel Temperature ◽  
Ic Engine

With the rapid scale expansion of the first generation of bio-liquid fuels, its impact on the prices of agricultural products, food security and the environment has begun to emerge and attracted extensive attention from governments and academia. A new multi-dimensional model of biodiesel spray combustion in an internal combustion (IC) engine is designed. Firstly, the BP neural network mining model is used to extract the spray combustion data of the IC engine. Then, based on the combustion data of biodiesel load in an internal combustion engine, burning rate and heat release, the principle of spray combustion of biodiesel is analyzed. Finally, from the two aspects of gas-phase control and liquid phase control, a multi-dimensional model of biodiesel spray combustion in IC engine is established and the spray combustion characteristics of biodiesel in IC engine are analyzed. The research results show that the model can effectively analyze the effect of load and fuel temperature on the spray combustion characteristics of biodiesel and the results of the model are almost the same as the actual data and the calculation accuracy is high. It is an effective method for studying the spray combustion characteristics of biodiesel.

Computation of the Turbulent Flow in an Internal Combustion Engine During Compression

1981 ◽  
Vol 103 (1) ◽  
pp. 75-81 ◽  
Author(s):  
P. S. Bernard
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Dimensional Model ◽  
Vorticity Field ◽  
Dynamical Equations ◽  
Compression Stroke ◽  
Dominant Feature ◽  
Mean And Variance ◽  
The Mean

A set of closed dynamical equations for the mean and variance of the turbulent vorticity field are used to study the piston driven flow in a two-dimensional model of an internal combustion engine cyclinder during the compression stroke. A dominant feature of the flow is observed to be the development of large corner vortices. In their vicinity intense production of turbulence occurs which locally greatly exceeds that resulting from the compression of intake generated turbulence. A comparison of the flow field at two strokes to bore ratios is made.

scholarly journals CFD Port Flow Simulation of Air Flow Rate in Spark Ignition Engine

2020 ◽  
Vol 10 (6) ◽  
pp. 87-95
Author(s):  
SMG Akele ◽  
C. Aganama ◽  
E. Emeka ◽  
Y. Abudu-Mimini ◽  
S. Umukoro ◽  
...  
Keyword(s):  
Internal Combustion Engine ◽  
Flow Rate ◽  
Combustion Engine ◽  
Flow Simulation ◽  
Internal Combustion ◽  
Spark Ignition Engine ◽  
Valve Lift ◽  
Cylinder Wall ◽  
Air Stream ◽  
Study Results

In the early stages of development of internal combustion engine (ICE), limitations such as speed, range, and lifespan led to series of researches resulting in the reduction or elimination of these limitations. Combustion in ICE is a rapid and controlled endothermic reaction between air in oxygen and fuel which is accompanied by significant increase in temperature and pressure with the production of heat, flame and carbon particle deposits. This combustion process is a phenomenon that involves turbulence, loss of air-fuel mixture during inflow and outflow into the cylinder. The objection of this study is to perform port flow analysis on ICE to determine flow rate and swirl at different valve lift under stationary engine parts.Methodology employed to analyze and solve the ICE port flow simulation is the use of CFD software that uses the finite volume method of numerical analysis to solve the continuity, Navier-Stokes and energy equations governing the air medium in the internal combustion engine cylinder. The model geometry for the analysis was generated using the Ansys Design Modeller for one cylinder, one suction port and one exhaust port, and two valves. The domain considered is internal combustion engine suction port with 86741 nodes and 263155 elements. Study results revealed that air mass was more concentrated around the valve and inlet port cross-section with swirling motion seen, air stream experienced turbulence as it flowed downwards inside the cylinder, air stream spread was turbulent which will eventually enhance smooth combustion, swirling air stream moves towards the cylinder wall where it experienced tumbling and turbulent which will eventually enhance smooth combustion. From the simulation it was revealed that mass flow rate of inlet air increases with valve lift.

LES of the Gas-Exchange Process Inside an Internal Combustion Engine Using a High-Order Method

2019 ◽  
Vol 104 (2-3) ◽  
pp. 673-692 ◽  
Author(s):  
G. K. Giannakopoulos ◽  
C. E. Frouzakis ◽  
P. F. Fischer ◽  
A. G. Tomboulides ◽  
K. Boulouchos
Keyword(s):  
Gas Exchange ◽  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Exchange Process ◽  
Internal Combustion ◽  
High Order ◽  
Order Method ◽  
High Order Method ◽  
Gas Exchange Process

scholarly journals Micro particle image velocimetry investigation of near-wall behaviors of tumble enhanced flow in an internal combustion engine

2018 ◽  
Vol 20 (7) ◽  
pp. 718-725 ◽  
Author(s):  
Masayasu Shimura ◽  
Shingo Yoshida ◽  
Kosuke Osawa ◽  
Yuki Minamoto ◽  
Takeshi Yokomori ◽  
...  
Keyword(s):  
Particle Image Velocimetry ◽  
Internal Combustion Engine ◽  
Particle Image ◽  
Combustion Engine ◽  
Flow Characteristics ◽  
Internal Combustion ◽  
Transfer Model ◽  
Micro Particle Image Velocimetry ◽  
Image Velocimetry ◽  
Crank Angle

A micro particle image velocimetry has been performed to investigate tumble enhanced flow characteristics near piston top surface of a motored internal combustion engine for three inlet valve open timing (−30, −15, 0 crank angle degrees). Particle image velocimetry was conducted at 340, 350 and 360 crank angle degrees of the end of the compression stroke at the constant motored speed of 2000 r/min. The measurement region was 3.2 mm × 1.5 mm on the piston top including central axis of the cylinder. The spatial resolution of particle image velocimetry in the wall-normal direction was 75 µm and the vector spacing was 37.5 µm. The first velocity vector is located about 60 µm from the piston top surface. The micro particle image velocimetry measurements revealed that the ensemble-averaged flow near the piston top is not close to the turbulent boundary layer and rather has tendency of the Blasius theorem, whereas fluctuation root-mean-square velocity near the wall is not low. This result shows that revision of a wall heat transfer model based on an assumption of the proper characteristics of flow field near the piston top is required for more accurate prediction of heat flux in gasoline engines.

The Effects of Backpressure on the Performance of Internal Combustion Engine and Automobile Exhaust Thermoelectric Generator

2022 ◽  
pp. 1-27
Author(s):  
Rui Quan ◽  
Yousheng Yue ◽  
Zikang Huang ◽  
Yufang Chang ◽  
Yadong Deng
Keyword(s):  
Heat Exchanger ◽  
Pressure Drop ◽  
Internal Combustion Engine ◽  
Thermoelectric Generator ◽  
Engine Speed ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Automobile Exhaust ◽  
Automobile Exhaust Thermoelectric Generator ◽  
Co Emission

Abstract The maximum generated power of automobile exhaust thermoelectric generator (AETEG) can be enhanced by applying inserted fins to its heat exchanger, for the temperature difference of thermoelectric modules (TEMs) is increased. However, the heat exchanger will result in undesired backpressure, which may deteriorate the performance of the internal combustion engine (ICE). To evaluate the backpressure on the performance of both the ICE and the AETEG, the model of ICE integrated with AETEG was established with the GT-power software and validated with the AETEG test bench. The heat exchangers with chaos shape and fishbone shape were proposed, their pressure drop with different engine speeds was studied, and their effects on the performance of both the AETEG and the ICE were analyzed. The results showed that compared with the fishbone-shaped structure, the pressure drop of chaos-shaped heat exchanger is larger at the same engine speed, which contributes to the increased maximum power and hot side temperature of the AETEG. Moreover, compared with the ICE without heat exchanger, the brake torque, brake power, volumetric efficiency and pumping mean effective pressure of the ICE assembled with chaos-shape and fishbone-shape heat exchanger reduce, and the corresponding brake specific fuel consumption, CO emission and CO2 emission increase because of the raised backpressure caused by the heat exchanger.

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