I work in industrial automation and have a background in pneumatics. I think you'll be surprised at how inefficient pressurizing/moving air is. I think the most practical solution (if you can call it that) is likely carrying an air reservoir that can be pumped up with a bike pump, and having a valve to trigger the whistle. There isn't really a safe way to carry compressed air on a bicycle because it's inherently dangerous to transport. There are lots of ways to make an unsafe air reservoir for example what Chris Notap on you tube does.
this post was submitted on 07 Jun 2024
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Install it with the mouthpiece facing the wind
My first thought for a compact, air-blower would be the inflater for air mattresses. They're already fairly small, have a high flow rate, and exist in forms which accept 12 VDC.
Another option is a small tank of compressed air, but that option is either heavy (steel tank) or stores air at inefficient, low pressures (plastic tank).
I suppose a third option is to rig a can of air-duster so that it blows through the whistle. That would be mechanically simple to implement a solenoid to press the valve, although there is a small environmental cost to using cans of air-duster regularly.
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