Whining at high RPM/heavy throttle

I just bought a 2015 Ford Taurus SE 3.5L (non-turbo) with 22K miles.  it runs beautifully.  However, at high RPM and high throttle when moving it makes a whining sound that sounds exactly like a supercharger, although not as loud.  If I set it to sport shift mode and allow it to wind up to high RPM at low to moderate throttle (accelerating slowly to moderately, but not letting it shift until redline) it does not make the sound.  It also won't make the sound when the car is in park/neutral.  This is making it difficult to tell where the sound is coming from.  I've never had a Taurus before, so I don't know if this whining is normal (e.g., maybe something to do with the variable cam timing?).

In case it's relevant or related, I will also note the following.  Sometimes I distinctly smell transmission fluid.  However, the car is not leaking a drop of anything.  I've closely inspected every square inch of the motor, transmission and exhaust with a snake camera and everything is clean enough to eat off of.  There's not a drop of any oil, coolant and transmission fluid on anything.  Using a data logger and other tools and doing lots of testing, the transmission, coolant and exhaust temperatures are all within normal range.  I don't know whether the above-said sound is coming from or related to the above-said whine.

As I said, I've never owned or even driven a Taurus before now, so I don't know whether any of the above is normal.  Any insight is greatly appreciated!