Setting Up the Injector

For the injection of fuel droplets into the engine cylinder, you create an injector Engine Part, which provides a template for defining the geometry and the physics of the injector. You specify the mass flow rate of the fuel in the form of a table that defines the mass flow rate as a function of crank angle. The initial temperature of the injected fuel is 310 K.

To create the injector:
  1. Right-click the Engine node and select Create Injector.
    The Edit tab opens and displays the injector template. The Graphics window updates and displays an injector with a single solid-cone nozzle. By default, the injector is centered in the cylinder head and aligned with the cylinder axis.
  2. In the Graphics window, change the view to obtain a similar engine position to the one shown below:


  3. Within the Edit dialog, in the Geometry tab, set the injector coordinate system to Laboratory.
The default nozzle of the injector is oriented along the x-axis of the injector coordinate system. For a sector model, you define one nozzle per sector.

To set up the nozzle:

  1. In the Nozzle Origin Reference group box, set the following properties:
    Property Setting
    [X, Y, Z] [1.5 mm, 0.0 m, -1.2 mm]
    Coordinate system Laboratory
  2. In the Nozzle Target Reference group box set the following properties:
    Property Setting
    [X, Y, Z] [2.47437 mm, 0.0 m, -1.42495 mm]
    Coordinate system Laboratory
  3. Click Update.
    Simcenter STAR-CCM+ In-cylinder updates the position and orientation of the nozzle as displayed below:


  4. In the Per Nozzle group box, set the following properties:
    Property Setting
    Discharge Coefficient 0.7
    Diameter 0.25 mm
    Length 1.5 mm
  5. Click Update.
    The diameter and the length of the nozzle update as displayed below:


To set up the injection conditions:
  1. Click the Physics tab.
  2. Set the mass flow rate using tabular data:
    1. Below the Mass Flow Rate property, next to the File drop-down menu, click Import.
    2. In the Import Table dialog, navigate to the inCylinder folder of the downloaded tutorial files.
    3. Select diesel_Injector_MassFlowRate.csv and click Open.
      The imported table describes the mass flow rate as a function of crank angle for the full injector. For a engine sector model with an injector positioned on the axis of periodicity, Simcenter STAR-CCM+ In-cylinder calculates the mass flow rates for the nozzles within the sector model accordingly.
      The plot in the Graphics window displays the mass flow rate as a function of crank angle for the full injector:


  3. For Fuel Temperature, set a constant value of 310.0 K.
  4. Click Update, then OK.
  5. Save the simulation .