Abstract
Investigating the performance of an airblast pressure swirl atomizer
Highlights
Pressure swirl atomizers (PSA) are widely used to atomize fuel in combustion chambers, for spray-drying purposes and in gas scrubbers as they produce the smallest mean droplet diameters based on the exit orifice dimensions when used as a single phase pressure atomizer [1]
In the following the influence of different gas and water mass flow rates, which can be found in Table 1, on sauter mean diameter for both atomizer designs are shown and compared
Because of this phenomenon the largest mean diameters can be observed at the lowest gas and water flow rates, which do not amount to the lowest air to liquid ratio (ALR), with values for the sauter mean diameter (SMD) being between 80 and 100 μm
Summary
Pressure swirl atomizers (PSA) are widely used to atomize fuel in combustion chambers, for spray-drying purposes and in gas scrubbers as they produce the smallest mean droplet diameters based on the exit orifice dimensions when used as a single phase pressure atomizer [1]. Inside a pressure swirl nozzle the liquid is being accelerated tangentially and axially, the generated centrifugal forces result in the liquid exiting the nozzle in the form of a hollow cone film with a thickness of only a few hundred micrometres, depending on the outlet diameter This characteristic is advantageous in combination with a gas nozzle within the present pressure gas atomizer design, since it is of great importance to spread the liquid as thin as possible in order to obtain the finest spray [2], even more so when dealing with liquids with high viscosities and surface tensions [3] like metal melts. The process is believed to include the formation of a thin liquid film in the vicinity of the outlet through upward recirculation and radial pressure gradients [7], at high mass flow rates the film might not form [8]
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