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We present similarity solutions for adiabatic bubbles that are blown by windshaving time independent mechanical luminosities and that are each mass-loadedby the hydrodynamic ablation of distributed clumps. The mass loading is`switched-on' at a specified radius (with free-expansion of the wind interiorto this point) and injects mass at a rate per unit volume proportional toM^delta r^lambda where delta = 4/3 (1) if the flow is subsonic (supersonic)with respect to the clumps. In the limit of negligible mass loading asimilarity solution found by Dyson (1973) for expansion into a smooth ambientmedium is recovered. The presence of mass loading heats the flow, which leadsto a reduction in the Mach number of the supersonic freely-expanding flow, andweaker jump conditions across the inner shock. In solutions with large massloading, it is possible for the wind to connect directly to the contactdiscontinuity without first passing through an inner shock. For a solution thatgives the mass of swept-up ambient gas to be less than the sum of the masses ofthe wind and ablated material, lambda < -2. Maximum possible values for theratio of ablated mass to wind mass occur when mass loading starts very close tothe bubble center and when the flow is supersonic with respect to the clumpsover the entire bubble radius. The maximum temperature in the bubble oftenoccurs near the onset of mass loading, and in some cases can be many timesgreater than the post-inner-shock temperature. Our solutions are relevant to egstellar wind-blown bubbles, galactic winds, etc. This work complements Pittardet al (2001) where it was assumed that clumps were evaporated throughconductive energy transport.Comment: 13 pages, 7 figures, to be published in A&

Self-similar evolution of wind-blown bubbles with mass loading by hydrodynamic ablation