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> You can definitely hear a 'w' sound.

Or "yi zuo shi da wuhan" here: https://www.youtube.com/watch?v=cWw6emkxmos#t=66 (same video as above, earlier timestamp)

You can argue it's not as strong as a 'w' in English, but it's definitely there, enough to justify saying 'a' instead of 'an'.

This is kind of complicated because [u] is a rounded vowel, so it's slightly "labialized" even if it's not preceded by [w].

Additionally, English spelling rules are complete insanity, and if an English speaker sees "uhan" they'd probably pronounce the 'u' as [ju:].