| 摘要 |
In order to prevent heat of working gases or vapours from flowing into components such as cylinder (4), piston (10), cylinder head (4A), valves (18, 20) and others relevant engine components, these surfaces are constructed of fluid-permeable material, with fluid-tight adjacent parts of non-permeable material, represented by cylinder casing (2). A suitable fluid is supplied by a pump (not shown) to channels (6) in cylinder (4) and by other means (not shown) to the piston (10) and to valves (18, 20). This fluid flows through the permeable material, (this material being porous, or non-porous with suitable holes), to form a replenishible layer (F) of fluid upon the components' surfaces. Heat which would otherwise transfer to these surfaces from the working gases or vapours is absorbed by the replenishible fluid as it is forced away from the surface, through the thickness of the static boundary layer, eventually becoming entrained with the working gases or vapours. |
