Analysis of the Pressure and the Gasleak of the Piston Ring of a New Double-Rotor Engine

2014 ◽  
Vol 620 ◽  
pp. 104-110
Author(s):  
Wen Min Li ◽  
Cun Yun Pan ◽  
Jin Zhou Chen
Keyword(s):  
Numerical Solution ◽  
Strong Evidence ◽  
Rotational Speed ◽  
Piston Ring ◽  
Gas Leakage ◽  
Matlab Program ◽  
Room Volume

This paper modeling the piston ring of a new double-rotor engine based on the analysis, use Matlab program some code and woke out the numerical solution of the model,analyze the change of the gas leakage in the condition of different gas-room volume, different opening area, different spindle rotational speed, which provide strong evidence for improving sealing of the new double-rotor engine and ameliorating sealing design.

scholarly journals Full Field Evaluation of the Stress Tensor Components in 2D Photoelasticity Via Computer Software

2016 ◽  
Vol 66 (2) ◽  
pp. 63-66
Author(s):  
Zbyněk Paška ◽  
František Fojtík ◽  
Petr Ferfecki
Keyword(s):  
Plastic Deformation ◽  
Numerical Solution ◽  
Stress Tensor ◽  
Computer Software ◽  
Field Evaluation ◽  
Full Field ◽  
Matlab Program

Abstract The aim of this work is to find out the components of stress tensor in plane specimens. For this purpose the photoelasticity methodology is used. In order to make this technique more comfortable for use, there was developed an algorithm in MATLAB program. The results are compared with numerical solution. The main advantages of the developed algorithm are the speed and the capabilities to extend to analyze the plastic deformation and strain conditions in the material during forming processes.

Numerical solution of mixed convection in a lid-driven cavity with arc-shaped moving wall

2017 ◽  
Vol 34 (3) ◽  
pp. 869-891 ◽  
Author(s):  
Muneer A. Ismael
Keyword(s):  
Heat Transfer ◽  
Mixed Convection ◽  
Numerical Solution ◽  
Rotational Speed ◽  
Uniform Mesh ◽  
Content Type ◽  
Driven Cavity ◽  
Moving Wall ◽  
Mesh Grid ◽  
Rayleigh Numbers

Purpose This paper investigates a numerical treatment to steady mixed convection in a lid-driven square cavity with arc-shaped moving wall or lid. The horizontal walls are thermally insulated. The vertical left wall is kept isothermally at high temperature, while the right arc-shaped moving wall is kept isothermally at low temperature. Design/methodology/approach Finite difference method in Cartesian coordinates with the upwind scheme is used in numerical solution. The irregular curved boundary has been treated by invoking non-uniform mesh grid with the ability to generate boundary fitted nodes. Jensen’s formulas of Neumann’s boundary condition have derived for the non-uniform mesh grid. The arc-shaped moving wall is considered as a segment of a rotating cylinder; thus, the studied pertinent parameters are the rotational speed of the arc-shaped wall in both aiding and opposing directions ω = −1,000-1,000, the arc-wall radius Ro = 0.5099-1.534 which is governed by its center (X0, Y0) = (1.1, 0.5)-(2.45, 0.5) and the Rayleigh number Ra = 103 − 106. Findings The results have shown that for low Rayleigh numbers, the rotational speed enhances heat transfer irrespective to the direction of rotation, while for high Rayleigh numbers, the aiding anticlockwise rotation (negative ω) enhances the heat transfer, while the opposing clockwise rotation (positive ω) manifests a retardation effect on the heat transfer. For a motionless arc-wall, its radius is ineffective for aiding heat transfer, while for non-zero arc-shaped wall speed, the heat transfer is an increasing function of its radius. Originality/value The arc-shaped moving wall has never been investigated until now. Therefore, the originality of this paper is due to studying the mixed convection in a lid-driven cavity with moving arc-shaped wall and inspecting the effect of its curvature and rotational speed in both directions on the flow and thermal fields.

scholarly journals Mathematical Model of Piston Ring Sealing in Combustion Engine

2015 ◽  
Vol 21 (4) ◽  
pp. 66-78 ◽  
Author(s):  
Grzegorz Koszałka ◽  
Mirosław Guzik
Keyword(s):  
Mathematical Model ◽  
Heat Exchange ◽  
Numerical Solution ◽  
Gas Flow ◽  
Piston Ring ◽  
Combustion Engine ◽  
Cylinder Liner ◽  
Computer Application ◽  
Piston Rings ◽  
Flow Through

Abstract This paper presents a mathematical model of piston-rings-cylinder sealing (TPC) of a combustion engine. The developed model is an itegrated model of gas flow through gaps in TPC unit, displacements and twisting motions of piston rings in ring grooves as well as generation of oil film between ring face surfaces and cylinder liner. Thermal deformations and wear of TPC unit elements as well as heat exchange between flowing gas and surrounding walls, were taken into account in the model. The paper contains descriptions of: assumptions used for developing the model, the model itself, its numerical solution as well as its computer application for carrying out simulation tests.

Numerical Analysis of Gas Leakage Problem Based on Improved Gas Storage Vessel Leakage Model

2016 ◽  
Author(s):  
Liping Sun ◽  
Zhiqiang Wan ◽  
Shangmao Ai ◽  
Jiaji Li
Keyword(s):  
Gas Storage ◽  
Differential Method ◽  
Residual Pressure ◽  
Gas Treatment ◽  
Storage Vessel ◽  
Leakage Model ◽  
Gas Leakage ◽  
Matlab Program ◽  
Residual Amount ◽  
Time Point

The gas leakage accidents always lead to great damages in the process of off-shore oil and gas treatment, consisting of health, wealth and environment losses. When leakage happens, the leakage duration, leak amount and other corresponding parameters are very important on the topic of emergency reaction and decision. The leaking process is complex and cumbersome, so the solving of the leakage problem could be quite difficult. On this point view, a specific and direct solution is given to the leakage problem on the basis of the leakage theory in this paper. According to the improved gas storage vessel leakage model, the mathematical differential method and discretization method are conducted to calculate the result of gaseous container leakage of any kind, consisting of leakage duration, leak amount, residual amount of gas and the residual pressure in the container. There are two probable flowing state of gas during the leakage. So, there is a requirement for different solving methods and principles for gas leakage in different flowing states. There is also calculation for residual amount of gas and residual gas pressure in the container at any given time point. The MATLAB program language is conducted to design the specific computing program and finish the GUI achievement of the program according to the fixed calculative methods and parameters concerned. Carry out the calculation of a fictive leakage problem with the designed MATLAB program, and get the result. It shows that the computing program comes to good leakage result, and the program can also result in acceptable outcome at any chosen time point on the issue of calculating residual amount and residual pressure of gas in the container. The computing program can solve the leakage problem veritably to some degree.

Simulation of Hydrodynamic Forces on Passenger Car Synchronizer Rings During Rattling

2011 ◽  
Author(s):  
Peter Fietkau ◽  
Axel Baumann ◽  
Bernd Bertsche
Keyword(s):  
Numerical Solution ◽  
Rotational Speed ◽  
Reynolds Equation ◽  
Hydrodynamic Forces ◽  
Simulation Environment ◽  
Experimental Transmission ◽  
Force Element ◽  
Multi Body ◽  
Oil Films

This paper presents a model to calculate hydrodynamic forces on a rattling synchronizer ring, i.e. a ring which is excited by rotational speed irregularities and therefore moves within its functional clearance. Based on the Reynolds Equation an analytical and a numerical solution for determination of the forces resulting from oil films on the ring are derived. The model is implemented in a user force element for the multi-body simulation environment SIMPACK and sample simulations with a simple experimental transmission are presented. The results show that the model is capable of representing the rattle characteristic of a synchronizer ring.

scholarly journals Cylinder liner deformation orders and efficiency of a piston ring-pack

2019 ◽  
Vol 95 ◽  
pp. 04001 ◽  
Author(s):  
Erjon Selmani ◽  
Cristiana Delprete ◽  
Arian Bisha
Keyword(s):  
Piston Ring ◽  
Combustion Engine ◽  
Cylinder Liner ◽  
Order Zero ◽  
Gas Leakage ◽  
System A ◽  
Sealing Capacity ◽  
Mass Flows ◽  
Piston Ring Pack ◽  
Ring Pack

One of the several losses of a combustion chamber is the gas leakage toward the crankcase due to imperfect sealing of the rings. It is commonly known as blow by and it affects efficiency and emissions. The paper initially describes a bibliographic review of the phenomenon, together with the equations of the system. A typical piston ring pack for internal combustion engine is proposed to be analysed and solved using ©Ricardo RINGPAK Solver. A specific issue such as Bore distortion orders were used to investigate the sealing capacity of the ring-pack in terms of ring dynamics, inter-ring pressures and mass flows. Bore distortion orders and their magnitude showed to affect the ring pack behavior. Order zero distortion resulted to be the most important order due to the highest amount of gas lost in the crankcase, while orders three and four resulted to generate high blow-by values, even if their magnitude of distortion is lower in comparison to other orders.

scholarly journals Two Step and Newton- Raphson Algorithms in the Extraction for the Parameters of Solar Cell

2021 ◽  
Vol 26 (1) ◽  
pp. 143-154
Author(s):  
Mohammed RASHEED ◽  
Suha SHIHAB ◽  
Taha RASHID
Keyword(s):  
Solar Cell ◽  
Numerical Solution ◽  
Iterative Methods ◽  
Load Resistance ◽  
Initial Value ◽  
Matlab Program ◽  
Pv Cell ◽  
Newton Raphson

The goal of this work is to find a numerical solution of nonlinear solar cell equation. This equation has been instructed using a single-diode model. The proposed method consists of solving the equation using two iterative methods with the initial value . Moreover, the Newton's and Two-step methods are used to determine the required the current, the voltage, and the power of the PV cell in the procedure of the present research. Different values of load resistance have introduced with these methods. The obtained results appeard that the proposed method is the most efficient compare with NRM and all the calculations are achieved using Matlab program.

scholarly journals Research of the Frictional Characteristics of Piston Ring - Cylinder Liner Based on GT-Suite

2018 ◽  
Vol 179 ◽  
pp. 01020
Author(s):  
Chao-fan SHI ◽  
Pu-kai WANG ◽  
Jian-min LIU ◽  
Qi KANG ◽  
Yi DONG
Keyword(s):  
Film Thickness ◽  
Rotational Speed ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Oil Film ◽  
Power Increase ◽  
Different Temperatures ◽  
Lubrication Condition ◽  
Frictional Condition ◽  
Lubrication Effect

Establish the piston ring-cylinder liner frictional model using the software of GT-Suite combine both of the frictional condition and lubrication, analyze and compute the thickness of oil film between piston ring and cylinder liner, the distribution of oil stress, and the force and power of the friction in rated condition. Then, mainly analyze the thickness of oil film and power of friction at the first piston ring under different temperatures of lubrication oil and different speeds. The results indicate that: The lubrication effect at first piston ring is poor, and the consumption of frictional power is high. The frictional power is significantly reduced with the oil temperature increases. However, the thickness of the oil film will decrease with the oil temperature increases, which is bad to the lubricational condition. Considering both of the lubrication condition and the frictional power, the frictional characteristics are better when the oil temperature is maintained at 80-90°C. With the increase of rotational speed, the oil film thickness and frictional power increase, but comparing with the influence on the frictional power, the change of rotational speed has less influence on the oil film.

scholarly journals Study of the Kinematics and Dynamics of the Ring Pack of a Diesel Engine by Means of the Construction of CFD Model in Conjunction with Mathematical Models

Lubricants ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 116
Author(s):  
Wilman Orozco Lozano ◽  
Marlen Del Socorro Fonseca-Vigoya ◽  
Jhon Pabón-León
Keyword(s):  
Diesel Engine ◽  
Mathematical Models ◽  
Piston Ring ◽  
Joint Analysis ◽  
Contact Friction ◽  
Integrated Analysis ◽  
Energy Losses ◽  
Connecting Rod ◽  
Piston Rings ◽  
Gas Leakage

The present research aims to analyze the kinematic and dynamic behavior of the piston ring package. The development of the research was carried out through the development of numerical simulation by means of CFD. The analysis involves the three piston rings for the development of simulations that are closer to the real conditions of the engine since most of the investigations tend to focus on the study of the compression ring only. The simulation was reinforced by the incorporation of mathematical models, which allow determining the piston kinematics, the lubrication properties as a function of temperature, contact friction, and gas leakage. For the simulation, the CAD of the piston and the connecting rod—crankshaft mechanism was carried out, taking as a reference the geometry of a diesel engine. From the results obtained, it was possible to show that the first ring exhibits considerably greater radial and axial movement compared to the second and third piston rings. Additionally, it was shown that the first and second rings tend to maintain a negative tilt angle throughout the combustion cycle, which facilitates the advancement of the combustion gases over the piston grooves. Therefore, it is necessary to use strategies so that these rings tend to maintain a positive inclination. The analysis of the pressure conditions in the second ring are 150% and 480% higher compared to the conditions present in the third ring. Due to the above, it is necessary to focus efforts on the design of the profile of this ring. The study of energy losses showed that the combination of leakage gases and friction are responsible for a mechanical loss between 6–16%. In general, the development of the proposed methodology is a novel tool for the joint analysis of the kinematic characteristics, pressure conditions, and energy losses. In this way, integrated analysis of changes caused by piston ring designs is possible.

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