Abstract: Thermal power plants have begun to shift their choice of fuel to cheaper coals such as lignite to reduce operating costs and to maintain fuel sustainability. However, the properties of the cheaper coals are highly fluctuating and pose challenges to the combustion process, leading to higher slagging or fouling propensities. The slagging process starts with the deposition of ash, which in turn originated from the complex process of soot formation in the flame area. Therefore, any abnormalities such as temperature distribution imbalances can be traced through monitoring techniques at the combustion state within the flame area. In this study, an imaging technique based on the visible wavelength regime was used to capture the temperature profiles of a 700 MW boiler near the burner area for different coal types and boiler operating conditions. The temperature profiles will serve as a point of reference for the plant personnel to determine the combustion state with respect to the boiler opera

• Publication Date: 27-Sep-2015
• DOI: 10.15224/978-1-63248-072-9-54
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Abstract: This paper is concerned with analysis of the turbulent flow over dimpled aerofoil profiles. Dimples of varying aspect ratio are used to study the effects on the skin-friction drag and lift. An external flow study was performed using ANSYS FLUENT. Simulations for external flow configuration with and without dimples were carried out and analyzed in detail. The resulting pressure drop and drag were observed. The objective was to clarify whether or not dimples cause reduction of the skinfriction drag and if it would provide better lift.

• Publication Date: 27-Sep-2015
• DOI: 10.15224/978-1-63248-072-9-55
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