scholarly journals Flow characterisation in an exhaust manifold of a single-cylinder internal combustion engine (ICE)

2021 ◽  
Vol 2129 (1) ◽  
pp. 012077
Author(s):  
N A Aziz ◽  
M T A Rahman ◽  
N A M Amin ◽  
M S Bin Mohamad ◽  
A Mohamad ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
Flow Characteristic ◽  
Combustion Engine ◽  
Fluid Dynamic ◽  
Exhaust System ◽  
Exhaust Manifold ◽  
Bending Angle ◽  
Bending Radius ◽  
Manifold Models ◽  
Cfd Method

Abstract This paper presents an investigation of flow characteristic inside the exhaust manifold that were designed with different bending angle (BA), bending radius (BR) and pipe diameter (Dp ). Five exhaust manifold models were developed and analysed by the computational fluid dynamic (CFD) method. Accordingly, the pressure distribution, velocity streamline and backpressure values were observed. The simulation results showed a different flow pattern for all five models, indicating the manifold design affect the flow characteristic inside the exhaust system. The results demonstrated that the pressure distribution inside the exhaust manifold is influencing its velocity streamline pattern, that directly effecting the outlet velocity of the exhaust gas. From this work, a small bending angle with a short straight pipe has led to a smoother exhaust flow and even exhaust velocity across the model. The results obtained from the simulation can be used as a guide to improve the understanding of the flow behaviour in the manifolds and might be used to improve the manifold design.

The Design and Analysis of Closed-Coupled Exhaust Manifold

2012 ◽  
Vol 215-216 ◽  
pp. 1241-1245
Author(s):  
Rang Shu Xu ◽  
Xiang Feng Yan ◽  
Ling Niu ◽  
Zhi Wei Dong
Keyword(s):  
Combustion Engine ◽  
Catalytic Converter ◽  
Exhaust System ◽  
Flow Distribution ◽  
Engine Exhaust ◽  
Business Software ◽  
Field Uniformity ◽  
Calculation Results ◽  
Cfd Method ◽  
Volume Method

The layout of closed-couple catalyst converter in internal combustion engine exhaust system is one of important way to reduce vehicle emission. CFD method based on finite volume method is adopted to numerical simulate flow distribution in the entrance of closed-coupled catalytic converter and applying business software of FLUENT to clarity the flow uniformity of inlet to ensure catalytic converter work efficiently and meet regulations. The flow field uniformity of entrance were studied and analyzed. Research finds that the shape of manifold has effect on dispersion of velocity in entrance and dispersion of velocity has a relatively strong correlation with pulsation flow. The flow reverse in junction deflect the air flow that flow into the entrance of closed-couple catalyst converter. Calculation results indicate that the uneven rate coefficient is 0.266 and volatility is 0.515 in the entrance of closed-couple catalyst.

scholarly journals An Experimental Analysis of the Fluid Dynamic Efficiency of a Production Spark-Ignition Engine during the Intake and Exhaust Phase

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Angelo Algieri
Keyword(s):  
Combustion Engine ◽  
Fluid Dynamic ◽  
Great Influence ◽  
Exhaust System ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Valve Lift ◽  
Induction Phase ◽  
Dynamic Efficiency ◽  
Experimental Characterization

The present work aims at analyzing the fluid dynamic efficiency of a four-stroke spark-ignition engine. Specifically, a production four-cylinder internal combustion engine has been investigated during the intake and exhaust phase. The experimental characterization has been carried out at the steady flow rig adopting the dimensionless flow and discharge coefficients. The analysis has highlighted the great influence of the valve lift on the volumetric efficiency of the intake and exhaust system. Furthermore, the global investigation has demonstrated that the throttle angle has a significant influence on the head permeability during the induction phase. Particularly, the throttling process effect increases with the valve lift. Finally, the work has shown that all experimental data can be correlated by a single curve if an opportune dimensionless plot is adopted.

CFD Investigation on the Flow Structure inside Cooling Roll

2014 ◽  
Vol 602-605 ◽  
pp. 172-175
Author(s):  
Yan Ming Song ◽  
Yang Yang
Keyword(s):  
Amorphous Alloy ◽  
Power Consumption ◽  
Pressure Distribution ◽  
Centrifugal Force ◽  
High Speed ◽  
Fluid Dynamic ◽  
Channel Structure ◽  
Simulation Results ◽  
Cfd Method ◽  
Channel Structures

Cooling roll is a key component in preparation of amorphous alloy ribbon process. The cooling roll rotates at a high speed that causes large centrifugal force on coolant. The reasonable channel structure facilitates the cooling effect and decreases power consumption. Different channel structures in the cooling roll are analyzed in this paper by computer fluid dynamic (CFD) method. The simulation calculated out the pressure distribution and streamline in different channel structure. The simulation results show that flow in case 2 is the optimal in three channel structures. Finally, the structure of the case 2 is manufactured and tested. It is shown that there is no flow block in the channel.

scholarly journals A Nonlinear Quasi-3D Approach for the Modeling of Mufflers with Perforated Elements and Sound-Absorbing Material

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
G. Montenegro ◽  
A. Della Torre ◽  
A. Onorati ◽  
R. Fairbrother
Keyword(s):  
Internal Combustion Engines ◽  
Transmission Loss ◽  
Combustion Engine ◽  
Reverse Flow ◽  
Fluid Dynamic ◽  
Exhaust System ◽  
Internal Combustion ◽  
Momentum Equation ◽  
Flow Chamber ◽  
3D Network

Increasing demands on the capabilities of engine thermo-fluid dynamic simulation and the ability to accurately predict both performance and acoustics have led to the development of several approaches, ranging from fully 3D to simplified 1D models. The quasi-3D approach is proposed as a compromise between the time-demanding 3D CFD analysis and the fast 1D approach; it allows to model the acoustics of intake and exhaust system components, used in internal combustion engines, resorting to a 3D network of 0D cells. Due to its 3D nature, the model predicts high-order modes, improving the accuracy at high frequencies with respect to conventional plane-wave approaches. The conservation equations of mass and energy are solved at cell centers, whereas the momentum equation is applied to cell connections including specific source term to account for the of sound-absorbing materials and perforated elements. The quasi-3D approach has been validated by comparing the predicted transmission loss to measured data for a number of standard configurations typical of internal combustion engine exhaust systems: a reverse-flow chamber and series chambers with perforates and resistive material.

An Energy Analyser for Contrast Enhancement in STEM

1974 ◽  
Vol 32 ◽  
pp. 434-435
Author(s):  
H.T. Pearce-Percy
Keyword(s):  
Contrast Enhancement ◽  
Bending Angle ◽  
Magnetic Sector ◽  
Conventional Design ◽  
Bending Radius ◽  
Sector Type

Recently an energy analyser of the uniform magnetic sector type has been installd in a 100KV microscope. This microscope can be used in the STEM mode. The sector is of conventional design (Fig. 1). The bending angle was chosen to be 90° for ease of construction. The bending radius (ρ) is 20 cm. and the object and image distances are 42.5 cm. and 30.0 cm. respectively.

Numerical study of fluid dynamic flow within an internal combustion engine cylinder

2017 ◽  
Author(s):  
Ana Marta Souza ◽  
Antônio César Valadares de Oliveira ◽  
Enrico Temporim Ribeiro ◽  
Francisco Souza ◽  
Marcelo Colombo Chiari
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Numerical Study ◽  
Fluid Dynamic ◽  
Internal Combustion ◽  
Dynamic Flow ◽  
Engine Cylinder

scholarly journals Preliminary Analysis of a New Power Train Concept for a City Hybrid Vehicle

Designs ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 19
Author(s):  
Roberto Capata
Keyword(s):  
Gate Valve ◽  
Combustion Engine ◽  
Fluid Dynamic ◽  
Electrical Power ◽  
Real Field ◽  
Power Train ◽  
Hybrid Propulsion ◽  
Performance Point ◽  
Combustible Gases ◽  
Mechanical Decoupling

This research aims to test the feasibility of a prototype of a newly designed thermal engine for a hybrid propulsion vehicle. This study consists of the implementation of an innovative supercharger for city car internal combustion engine ICE (900 cc). The preliminary proposal presented here is to mechanically disconnect the compressor/turbine device, supporting the rotation of the compressor with a dedicated electric motor and connecting a turbine to a generator. Mechanical decoupling will allow both machines to be designed for operating closer to their maximum performance point, for most of the expected real field of operation. Specifically, the turbine is likely to have a lower rotation speed than the original group and will, therefore, be slightly larger. The advantage is that, while in the current supercharger groups the surplus at high regimes is discharged through the waste-gate valve without expanding in a turbine, in the configuration proposed, all the energy of the combustible gases is used by the turbine to generate electrical power that can be used where required. Once the motorization of the vehicle (999 cc) has been fixed, the two turbomachines will have to be studied and designed, looking where possible, for commercial components. Finally, a computational fluid dynamic CFD will be needed to verify the validity of the choice, followed by careful experimentation campaigns.

Sign in / Sign up

Export Citation Format

Share Document