Does that help "make it insensitive to the external flow field"? It would make sense.
NO it helps in this way, both keep the soft sleeve material in good shape , I have seen about a thousand that have many flights, and ones with filters are in much better shape, and it also keeps some of the sand dirt debris out of the engine, the BRULINE filter is also taller and trumpet shape, which helps, with "some" engines keeping fuel in them, and not letting it spill out of the top of the venturie, others don't need it near as badly as some, I was speaking of 1 layer of panty hose, you will need to add additional layers to make the venturie "act" smaller
Next thing I would like to test is L shaped intakes, I have rubber intake filters that are "L" shaped so you can run them , into the wind, pointing outboard, or pointed inboard
, I have a good idea what will be the results, but testing will verify