Engine performance enhancement by improving heat transfer in between exhaust valve and valve seat through CFD (transient thermal) simulation

2021 ◽  
Author(s):  
M. A. S. M. Hassan ◽  
A. B. Shahriman ◽  
Z. M. Razlan ◽  
N. S. Kamarrudin ◽  
I. Azizul Aziz ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Performance Enhancement ◽  
Engine Performance ◽  
Thermal Simulation ◽  
Exhaust Valve ◽  
Valve Seat ◽  
Transient Thermal

Diesel Engine Performance Improvement for Constant Speed Application Using CFD

2017 ◽  
Author(s):  
Balasaheb S. Dahifale ◽  
Anand S. Patil
Keyword(s):  
Combustion Chamber ◽  
Fuel Consumption ◽  
Performance Improvement ◽  
Test Data ◽  
Engine Performance ◽  
Exhaust Valve ◽  
Fine Tuning ◽  
Intake Valve ◽  
Valve Seat ◽  
Load Conditions

The detailed investigation of flow behavior inside the combustion chamber and performance of engine is most challenging problem due to constraints in Experimental Data collection during testing; However, Experimental testing is essential for establishment of correlation with CFD Predictions. Hence, the baseline engine was tested at different load conditions and validated with CFD results, before it was optimized for performance improvement. The objective of the CFD Prediction was not only to optimize performance (Fuel Efficiency, Power, Torque, etc.) & Emissions Reduction, but also to assess feasibility of Performance Upgrade Potential. In the present CFD study, surface mesh and domain was prepared for the flame face, intake valve, intake valve seat, exhaust valve, exhaust valve seat and liner for closed volume cycle, between IVC and EVO using CFD code VECTIS. Finally simulations for three different load conditions were conducted using VECTIS solver. Initially, in-cylinder pressure vis a vis crank angle prediction was carried out for 100%, 75% and 50% load conditions. Then the fine tuning of (P-ϴ) diagram for different load conditions was conducted by varying different combustion parameters. Further, the engine performance validation was carried out for rated and part load conditions in terms of, IMEP, BMEP, break specific fuel consumption and power output, while NOx mass fractions were used to convert the NOx to g/kWh for comparison of emission levels with the test data. Finally optimized re-entrant combustion chamber and modified valve timing with optimum fuel injection system simulation was carried out to achieve target performance with reduced fuel consumption. A 3D CFD result showed reduction in BSFC and was in close agreement with the test data.

scholarly journals Engine Performance Analysis by Studying Heat Transfer in the Valve Seat through Steady-State Thermal Simulation

2021 ◽  
Vol 2129 (1) ◽  
pp. 012097
Author(s):  
M A S M Hassan ◽  
A B Shahriman ◽  
Z M Razlan ◽  
N S Kamarrudin ◽  
W K N Khairunizam ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Steady State ◽  
High Speed ◽  
Thermal Loading ◽  
Combustion Engine ◽  
Combustion Process ◽  
Optimal Operation ◽  
Exhaust Valve ◽  
Valve Seat

Abstract As the engine reached high speed, the exhaust valve temperature increased exponentially due to the exhaust gas produced by the combustion process between the mixture of air and fuel within the combustion chamber of the internal combustion engine. The valve is subjected to thermal loading due to high temperature and pressure within the cylinder, which must withstand a material temperature for sustainable and optimal operation. To avoid this loss, a perfect medium must be prepared to ensure that the heat is extracted smoothly. This can be done when the valve is in contact with the seat and there is a periodic heat transfer contact. Therefore, it is imperative to research the correlation between valve and valve seat to understand the two sections’ heat transfer mechanism. In this study, thermal contact analysis was used to identify heat transfer between the valve and the valve seat as both parts are interconnected. This research also has an interest in studying the two surface conduction mechanisms as the exhaust valve closed in steady-state conditions. Thus, this study portrays a significant method, particularly for the determining the distribution of temperature, heat flux, and heat flux direction between the valve and its seat using ANSYS Workbench.

SPACE THERMAL SIMULATION FOR SATELLITE HEAT TRANSFER DESIGN EVALUATION

1974 ◽  
Author(s):  
Vasily D. Prian ◽  
Andy T. Calimbas ◽  
Edward A. LaBlanc
Keyword(s):  
Heat Transfer ◽  
Thermal Simulation ◽  
Design Evaluation

scholarly journals Comparison of Thermal Stress during Short-Circuit in Different Types of 1.2 kV SiC Transistors Based on Experiments and Simulations

2017 ◽  
Vol 897 ◽  
pp. 595-598
Author(s):  
Diane Perle Sadik ◽  
Jang Kwon Lim ◽  
Juan Colmenares ◽  
Mietek Bakowski ◽  
Hans Peter Nee
Keyword(s):  
Thermal Stress ◽  
Short Circuit ◽  
Thermal Simulation ◽  
Temperature Evolution ◽  
Power Devices ◽  
Different Types ◽  
Transient Thermal

The temperature evolution during a short-circuit in the die of three different Silicon Carbide1200-V power devices is presented. A transient thermal simulation was performed based on the reconstructedstructure of commercially available devices. The location of the hottest point in the device iscompared. Finally, the analysis supports the necessity to turn off short-circuit events rapidly in orderto protect the device after a fault.

Exhaust Valve Seat Leakage

1997 ◽  
Author(s):  
John Hoard ◽  
Peter Moilanen
Keyword(s):  
Exhaust Valve ◽  
Valve Seat
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