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I am looking at this paper for unsteady propeller blade loading estimation in non-uniform flow. According to the paper, we can estimate the thrust of a propeller blade section in non-uniform flow by multiplying the quasi-steady thrust with the Sears function S:

$T'_{us}(r,\sigma) = T'_{qs}(r,\sigma) S(r,\sigma)$

r = radial section; sigma = reduced frequency.

The quasi-steady thrust is just the outcome of a change in the sectional advance ratio due to non-uniform flow.

I am wondering if there's such a thing as "unsteady change in angle of attack" too, or that is only quasi-steady, thus entirely dependent on the change in local advance ratio.

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  • $\begingroup$ There is such a thing as an unsteady angle of attack if you define the term -- what do you mean by that? In the context of your question I could see how it might be meaningful if you were making rapid changes in propeller pitch -- is that what you mean? $\endgroup$ Commented Dec 21, 2024 at 17:50
  • $\begingroup$ Sorry for the late reply. I was referring to the change in a blade element section angle of attack when the propeller is at an angle of attack. I know that the flow non-uniformity will produce unsteady blade loading. I was wondering if there was such a thing as "unsteady change in angle of attack" too. $\endgroup$ Commented Jan 3 at 17:06

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