Arguably, the solid rocket motor is in this vein. While I've never seen a design that consumes the outer shell, the inner material is designed to burn as comple

Arguably, the solid rocket motor is in this vein. While I've never seen a design that consumes the outer shell, the inner material is designed to burn as completely as possible, and the chemistry and physical composition is even designed to cause the burn to happen in a proper combustion-chamber shape.