Paper presented at the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012.
The heat transfer that occurs in the cylinder of internal combustion engines has a great influence on the efficiency, power output and emissions. Development of a model that is able to predict the heat transfer is needed in order to be able to use simulations for optimization of these three properties. Prior to developing a model, the heat transfer phenomenon has to be thoroughly investigated by performing measurements inside an engine. This allows for a detailed understanding of the process and for a validation of model predictions. In previous works, a commercially available thermopile has been used to measure the heat transfer in a hydrogen combustion engine. The use of this sensor as a heat flux sensor has already been positively evaluated in a previous paper. Its dimensions, however, limit its usability for engine measurements, as it is too large to mount in production type engines. Therefore, a comparison with two alternative sensors was performed to select the best one for engine heat transfer research. Two variations of a calibration rig were used, one with a fast opening shutter and one with a chopper with adjustable speed. This paper presents a comparison of the rise time based on measurements on both test rigs. Furthermore, measurements were carried out on a test engine to evaluate the capability of the sensors to determine the heat transfer to the cylinder walls.
The field of information security is a fast-growing discipline. Even though the effectiveness
of security measures to protect sensitive information is increasing, people remain
susceptible to manipulation and thus the ...
Vos, Marinda(University of Pretoria. Faculty of Engineering, Built Environment and Information Technology. Dept. of Industrial and Systems Engineering, 2015-05-13)
The focus of this project is on extending a new method known as the farm site development method that is developed by focusing on industrial engineering techniques. This new method allows farmers / farm managers to expand ...