Numerical Study of the Maximum Impact on Engine Efficiency When Insulating the Engine Exhaust Manifold and Ports during Steady and Transient Conditions

2020 ◽  
Author(s):  
Alberto Broatch ◽  
Pablo Olmeda ◽  
Jaime Martin ◽  
Amin Dreif
Keyword(s):  
Numerical Study ◽  
Exhaust Manifold ◽  
Engine Exhaust ◽  
Transient Conditions ◽  
Engine Efficiency

A Three-Dimensional Transient Numerical Study of a Close-Coupled Catalytic Converter Internal Flow

2004 ◽  
Author(s):  
Bassem H. Ramadan
Keyword(s):  
Oxygen Sensor ◽  
Numerical Study ◽  
Catalytic Converter ◽  
Three Dimensional ◽  
Internal Flow ◽  
Operating Conditions ◽  
Current Status ◽  
Reacting Flow ◽  
Exhaust Manifold ◽  
Engine Exhaust

Recently, the new regulations on emission standards have prompted a reconsideration of the design of automotive catalytic converters in order to reduce the light-off period of the catalyst. The catalytic converter light-off period is very Important since almost 80% of the emissions from vehicles occur within the first three minutes after cold start in the FTP-75 test. In order to meet these new regulations, current studies have suggested that the catalyst should be “close-coupled”; that is fitted close to the engine exhaust manifold. In order to design “close-coupled” converters, the designer may have to resort to truncated inlet and outlet cones, or distorted inlet pipes due to space limitations. Hence, it is very difficult to achieve good mixing of the exhaust gas, and a good flow distribution at the inlet cross section of the monolith. Based on such a current status in the study of the catalytic converter, the present work focuses on the time-dependent flow patterns, both in the exhaust manifold and the catalytic converter using Computational Fluid Dynamics (CFD). A three-dimensional grid model of an engine exhaust manifold and a close-coupled catalytic converter was developed and analyzed. The flow simulations were performed using KIVA-3 for non-reacting flow fields. These simulations were performed with transient boundary conditions applied at the inlet to the exhaust runners to simulate the opening and closing of exhaust valves. The CFD results were used to study flow uniformity under different operating conditions and to identify the best location of the oxygen sensor.

Analysis of a Diesel Engine Exhaust Manifold

2014 ◽  
Author(s):  
Yiran Yang ◽  
Miao He ◽  
Masoud Mojtahed
Keyword(s):  
Diesel Engine ◽  
Stress Distribution ◽  
Operating Conditions ◽  
Exhaust Manifold ◽  
Ansys Software ◽  
Engine Exhaust ◽  
Diesel Engine Exhaust ◽  
Engine Efficiency ◽  
Key Factor ◽  
Coolant Velocity

The exhaust manifold is an essential component of an engine, which has become increasingly important because of innovations in the industry. Thus, the efficiency of an exhaust manifold is a key factor in overall engine efficiency. In operating conditions, there are many factors that may influence the performance of an exhaust manifold, such as temperature, pressure, wall thickness, coolant velocity, etc. A manufacturer of diesel engine’s exhaust manifolds was interested in investigating the performance of its manifolds. This paper describes the method of analysis and results obtained by Fluent and ANSYS software. The purpose of the project is to analyze the stress distribution and locate the areas most prone to failure.

scholarly journals Energy Production in Solar Collectors in a University Building Used to Improve the Internal Thermal Conditions in Winter Conditions

2021 ◽  
Vol 246 ◽  
pp. 03005
Author(s):  
Eusébio Conceição ◽  
João Gomes ◽  
Mª Manuela Lúcio ◽  
Hazim Awbi
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Energy Production ◽  
Numerical Study ◽  
Thermal Conditions ◽  
Solar Collectors ◽  
Transient Conditions ◽  
Winter Conditions

In this numerical study the energy production in solar collectors in a University building used to improve the internal thermal conditions is made. Passive and active solutions, using external solar collector and internal thermo-convectors, are used. The numerical simulation, in transient conditions, is done for a winter typical day with clean sky. This numerical study was carried out using a software that simulates the Building Dynamic Response with complex topology in transient conditions. The software evaluates the human thermal comfort and indoor air quality levels that the occupants are subjected, Heated Ventilation and Air Conditioned energy consumption, indoor thermal variables and other parameters. The university building has 107 compartments and is located in a Mediterranean-type environment. External solar water collectors, placed above the building’s roof, and internal thermo-convectors of water/air type, using mixing ventilation, are used as passive and active strategies, respectively. The thermal comfort level, using the Predicted Mean Vote index, and the indoor air quality, using the carbon dioxide concentration, are evaluated. The results show that in winter conditions the solar collectors improve the thermal comfort conditions of the occupants. The indoor air quality, in all ventilated spaces, is also guaranteed.

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