[maka15]

I'm trying to calculate a scavenged prechamber, currently all boundaries but the inlet are closed, trying to simulate filling the prechamber (filled with N2 and O2) with CH4. Inlet are 6 holes (nozzle of the injector).
I set an flowRateInletVelocity BC on the inlet and tried various pressure BC-types (i.e. fixedFluxExtrapolatedPressure, fixedValue, zeroGradient). I am using rhoPimpleFoam as solver.
With all my pressure BCs the simulation runs just fine and converges well, but when I look at the results, the flowRateInletVelocity-BC seems not to work, as expected
I set a massflow of 0.0001kg/s (part of 0/U attached), but when I look at the results of

postProcess -func "patchIntegrate(name=Vorkammer_DI_Einlass,phi)"

, phi never exceeds 1e-12 and there is no CH4 getting into the prechamber, but the velocity at the inlet goes up to over 500m/s in the right direction and the temperature is rising around the inlet.
Does anybody have an idea, what I could do wrong, preventing OF from satisfying the massflow-BC?

relevant part of 0/U:

FoamFile
{
    version     2.0;
    format      ascii;
    class       volVectorField;
    location    "0";
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 1 -1 0 0 0 0];

internalField   uniform (0 0 0);

boundaryField
{
(...)
    Vorkammer_DI_Einlass
    {
	type          flowRateInletVelocity;
        massFlowRate    table
		                (
                            (0 0)
                            (0.0003 0.0001)
                            (0.0047 0.0001)
                            (0.005 0)
                        );
        rho               rho;	
        rhoInlet        3.47355;
        value	    uniform (0 0 0);
    }
}