Abstract
High-fogging is widely used to rapidly increase the power outputs of stationary gas turbines. Therefore, water droplets are injected into the inflow air, and a considerable number enter the compressor. Within this paper, the primary process of droplet evaporation is investigated closely. A short discussion about the influential parameters ascribes a major significance to the slip velocity between ambient gas flow and droplets. Hence, experimental results from a transonic compressor cascade are shown to evaluate the conditions in real high-fogging applications. The measured parameter range is used for direct numerical simulations to extract evaporation rates depending on inflow conditions and relative humidity of the air flow. Finally, an applicable correlation for the Sherwood number in the form of S h ( R e 1 / 2 S c 1 / 3 ) is suggested.
Highlights
The direct numerical simulation (DNS) gives a complete insight into the detailed processes during the droplet evaporation
The present results show that the magnitude of the evaporation rate increases with increasing droplet diameter, slip velocity, and temperature level
The current paper investigates the evaporation of water droplets under conditions present in compressors of stationary gas turbines used with high-fogging
Summary
Water injection into the compressor of stationary gas turbines, called high-fogging, is an effective and widely used procedure to increase the power output rapidly. Evaporation of injected droplets into the main flow is the primary process in high-fogging applications if one considers the full compressor with all stages, and needs to be investigated and modeled accurately. Difficulties in developing such a model for this context arise from the complexity of the process and the diverse influencing quantities.
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