Developing racing exhaust system performance using computational fluid dynamics software

2020 ◽  
Author(s):  
F. Hidayanti ◽  
Kreshna A. M. Adi ◽  
E. K. Wati
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
System Performance ◽  
Exhaust System

scholarly journals Analysis of Flow Field for Automotive Exhaust System Based on Computational Fluid Dynamics

2014 ◽  
Vol 8 (1) ◽  
pp. 587-593 ◽  
Author(s):  
Jianmin Xu ◽  
Shuiting Zhou
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Field ◽  
Pressure Loss ◽  
Engine Speed ◽  
Flow Characteristics ◽  
Exhaust System ◽  
Internal Flow ◽  
Dual Mode ◽  
Leading Role

In this study, a double mode muffler that can automatically adjust the exhaust resistance according to the engine speed was designed. Based on computational fluid dynamics theory, the governing equation and turbulent equations for numerical simulation of muffler were established. The pressure loss and the internal flow characteristics of the double mode muffler were analyzed by CFD software. The influence of the distance between the main and submuffler on the flow field of exhaust system was researched. In addition, the internal pressure distribution, the turbulence intensity distribution and the velocity vector diagram of the dual mode muffler were also obtained. The pressure loss of double mode muffler is mainly distributed in the area of air mutations. Main silencer plays a leading role in the entire exhaust system. Therefore, the trend of the pressure loss of the exhaust system with the change in the distance between main and auxiliary muffler was also obtained. When the distance between the main and auxiliary silencer changed from 50 mm to 300 mm, the pressure loss of exhaust system muffler first increased and then decreased, and following this, continued to increase. The results will provide a theoretical basis for designing complex exhaust system.

scholarly journals Design Optimization of Muffler of an Internal Combustion Engine using Computational Fluid Dynamics

2020 ◽  
Vol 8 (5) ◽  
pp. 2922-2927
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Combustion Engine ◽  
Exhaust System ◽  
Back Pressure ◽  
Dynamics Analysis ◽  
Trial Testing ◽  
Flow Through ◽  
Load Conditions ◽  
Engine Power

A Muffler is a gadget for lessening the measure of clamor produced by the fumes of an inner burning motor. Inner burning motors are commonly furnished with a fumes suppressor (Silencer) created by the ignition procedure to smother the acoustic beat. The direct cause of back pressure in the engine will be the stress and temperature of exhaust gases that flow through the silencer. To relieve the back pressure in the exhaust system, the engine power must be used. Execution of Muffler underneath different working state is typically acquired through design analysis. Accessibility of compressible flow execution parameters is limited, and trial testing can be cost restrictive. The mathematical fluid Dynamics analysis provides better results for this case. The ability to use analytical fluid components is a test to determine their suitability to determine the conditions of their display. The venture's goal is to examine t he gases gas stream attributes in the suppressor's current and modified structure. Our effort is to focus on enhancing the structure so that there is less back weight and silencer's expanded existence. The Computational Fluid elements investigation would be completed by utilizing CFD apparatus CFX. With parameters such as weight and temperature dissemination, disturbance power and liquid power at different load conditions, an extensive report would be done.

scholarly journals Aspects of aero-engine nacelle drag

2018 ◽  
Vol 233 (5) ◽  
pp. 1667-1682 ◽  
Author(s):  
Matthew Robinson ◽  
David G MacManus ◽  
Christopher Sheaf
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Mach Number ◽  
Wind Tunnel ◽  
Near Field ◽  
Pressure Ratio ◽  
Exhaust System ◽  
Extraction Methods ◽  
Field Method ◽  
Rate Of Change

To address the need for accurate nacelle drag estimation, an assessment has been made of different nacelle configurations used for drag evaluation. These include a sting mounted nacelle, a nacelle in free flow with an idealised, freestream pressure matched, efflux and a nacelle with a full exhaust system and representative nozzle pressure ratio. An aerodynamic analysis using numerical methods has been carried out on four nacelles to assess a near field drag extraction method using computational fluid dynamics. The nacelles were modelled at a range of aerodynamic conditions and three were compared against wind tunnel data. A comparison is made between the drag extraction methods used in the wind tunnel analysis and the chosen computational fluid dynamics approach which utilised the modified near-field method for evaluation of drag coefficients and trends with Mach number and mass flow. The effect of sting mounting is quantified and its influence on the drag measured by the wind tunnel methodology determined. This highlights notable differences in the rate of change of drag with free stream Mach number, and also the flow over the nacelle. A post exit stream tube was also found to create a large additional interference term acting on the nacelle. This term typically accounts for 50% of the modified nacelle drag and its inclusion increased the drag rise Mach number by around Δ M = 0.026 from [Formula: see text] to [Formula: see text] for the examples considered.

The Smoke Exhausts Research on Urban Underground Fast Road

2014 ◽  
Vol 614 ◽  
pp. 118-123
Author(s):  
Xi Zhou ◽  
Dong Dong Liu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Characteristics ◽  
Exhaust System ◽  
Test Site ◽  
Smoke Flow ◽  
Temperature Distributions ◽  
Ansys Cfx ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Laws

The aim of this research is to verify the effectiveness of smoke exhaust system including natural, longitudinal and semi-transverse system in urban underground fast road. For this research, a series of hot smoke tests were accomplished in experimental field in The Ministry of Transportation test site. The temperature distributions were recorded by thermocouples and the smoke flow laws were counted by visibility sensors. Meanwhile, the temperature distributions in the tunnel has been simulated by using the Computational Fluid Dynamics (CFD) software of ANSYS CFX. In terms of the experiments and simulation above, the smoke flow characteristics were demonstrated. Some valuable advices are given finally which can be applied to the design of smoke exhausted system in urban underground fast road.

Using Experimental Fluid Dynamics and Computational Fluid Dynamics for Evaluating Periodic Mixing

2018 ◽  
Author(s):  
Judith Ann Bamberger ◽  
Leonard F. Pease ◽  
Kurtis P. Recknagle ◽  
Carl W. Enderlin ◽  
Michael J. Minette
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
System Performance ◽  
Experimental Investigations ◽  
Cfd Simulations ◽  
Mixing Processes ◽  
Experimental Fluid Dynamics ◽  
Computational Fluid Dynamics Cfd ◽  
Experimental Fluid ◽  
Pulse Jet

Periodic mixing using pulse jet mixers is being developed and applied for processing unique slurries of radioactive waste that depending upon the slurry properties may possess either Newtonian or non-Newtonian characteristics. To investigate the performance of these mixing systems, scaled experimental fluid dynamics (EFD) experiments have been conducted and in addition, for certain investigations, computational fluid dynamics (CFD) simulations have been applied. The purpose of this paper is to describe the periodic mixing processes, elaborate regarding the types of scaled experiments that were conducted, and present examples of computational investigations conducted to further define the mixing system performance. The experimental investigations showed the ability to track visual metrics such as cloud height and cavern size. The computational investigations demonstrated the ability to model full-scale experiments with Newtonian slurries.

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