OK I see - this is not as I would have expected. I would have thought with a short volume to fill up between the hsv and the jet that it would atomize on low IDCs. How low are the IDCs we are talking about? I guess one issue is I have never seen a pulled jet engaged at less than 25% IDCs.
Try it with more pressure and see how it works then. I still think it is a function of how quickly and how much flow fills the volume between the hsv and the jet. The smaller the volume or the more quickly the volume can be filled the lower the IDC should be able to be and still atomize.
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