The most common solution is simply use the spinning low pressure compressor to flung water out to the bypass duct, the core intake is much drier after this.
The engines are tested with huge amount of water ingression under power before they are tested.
The bypass design actually meant that it’s easier to pass the shower test under high power settings than low power or idle. At low power, the flames are less stable and the fan turns slower, making more water flooding into the core. There has been flameout incidents in this situation before low/idle test became a requirement as well.
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