A cyclonic fluid separator of the type comprising a tubular throat portion in which a fluid mixture is accelerated to a subsonic or supersonic speed and thereby expanded and cooled down so that condensable components condense and/or solidify and then swirl into a diverging fluid outlet section that comprises an outer secondary outlet for condensables enriched fluid components and an inner primary outlet for condensables depleted fluid components comprises swirl imparting vanes that protrude from a central body that extends through at least part of an inlet section of the separator, wherein the central body has, at a location upstream of the throat portion, a larger outer width (2R.sub.o max) than the smallest inner width (2R.sub.n min) of the throat portion.