23.3.7 Point Properties for Plain-Orifice Atomizer Injections

For a plain-orifice atomizer injection, you will define the following initial conditions under Point Properties:

• position

  Set the $x$, $y$, and $z$ positions of the injected stream along the Cartesian axes of the problem geometry in the X-Position, Y-Position, and Z-Position fields. ( Z-Position will appear only for 3D problems).

• axis (3D only)

  Set the $x$, $y$, and $z$ components of the vector defining the axis of the orifice in the X-Axis, Y-Axis, and Z-Axis fields.

• temperature

  Set the temperature of the streams in the Temperature field.

• mass flow rate

  Set the mass flow rate for the streams in the atomizer in the Flow Rate field. Note that in 3D sectors, the flow rate must be appropriate for the sector defined by the Azimuthal Start Angle and Azimuthal Stop Angle.

• duration of injection

  For unsteady particle tracking (see Section  23.2.2), set the starting and ending time for the injection in the Start Time and Stop Time fields. When In-Cylinder mesh motion is enabled, set the starting and ending crank angles for the injection in the Start Crank Angle and Stop Crank Angle fields.

• vapor pressure

  Set the vapor pressure governing the flow through the internal orifice ( $p_v$ in this table in the separate Theory Guide) in the Vapor Pressure field.

• diameter

  Set the diameter of the orifice in the Injector Inner Diameter field ( $d$ in this table in the separate Theory Guide).

• orifice length

  Set the length of the orifice in the Orifice Length field ( $L$ in this table in the separate Theory Guide).

• radius of curvature

  Set the radius of curvature of the inlet corner in the Corner Radius of Curvature field ( $r$ in this table in the separate Theory Guide).

• nozzle parameter

  Set the constant for the spray angle correlation in the Constant A field ( $C_A$ in this equation in the separate Theory Guide).

• azimuthal angles

  For 3D sectors, set the Azimuthal Start Angle and Azimuthal Stop Angle.

See this section in the separate Theory Guide for details about how these inputs are used.