With beta features enabled (as described in Introduction), injections defined, and Unsteady Particle Tracking enabled in the Discrete Phase Model dialog box, you can create DPM Report Definitions with Spray Half-Angle as the Output Type.
Solution → Reports
→ Definitions → New
→ DPM Report → Spray
Half-Angle...
Spray Half-Angle reports are similar to the Spray Penetration Length reports except that the spray half-angle is calculated as the opening half-angle (between the axis and surface of a cone) that contains the specified mass fraction of all the particles belonging to the selected injection(s).
To setup the DPM Report Definition dialog box:
Enter a name for the report definition under Name.
(optional) To have Fluent calculate a running average for the DPM Report Definition you can enter a positive integer greater than 1 (the default) for Average Over.
Specifying a number greater than 1 means that Fluent will print, plot, and write the running average value of the selected variable instead of the current value of the same variable.
The value reported is averaged over the last
iterations/time steps, where 
is your specified Average Over value. When the iteration number is lower than 
, Fluent calculates the average of the available variable values.
If you want the report definition written to a file or plotted, either select an existing report file or plot from the Report Files or Report Plots lists, or create a new report file or plot by enabling Report File and/or Report Plot in the Create group box.
If you want the report definition available as an output parameter, enable Create Output Parameter.
Select the injection(s) that will be used for calculating the spray half-angle from the Injections list.
Single injection selected: Fluent uses the specified injection location or user-specified coordinates.
Multiple injections selected: Fluent averages the coordinates of the injections. If Fluent cannot average the coordinates a message will be printed in the console—in this case you should manually specify the injection origin and axis coordinates.
Specify the Particles Mass Fraction.
This is the injection/particle mass fraction expected within the cone specified by the origin, direction, and the half-angle calculated by this report.
(optional) Enable User-Specified Origin and Direction to manually specify the origin and direction for the selected injection(s).
Click to create the DPM Report Definition.