Abstract: Heat transfer possibly results in the thermal wrinkling of transpiration cooling platelet for the liquid rocket engine's thrust chamber. A rectangular sheet which has 3 freely-supported sides and 1 free side is assumed. Stability in the diffusion flow field of the formed platelet is discussed. Deformation caused by thermal stress in the typical structure of the platelet thrust chamber is analyzed. The relationship formula between the width of the transpiration gap and the thickness of the platelet is obtained. Design and calculation method to avoid thermal wrinkling of the platelet is given by a case study.

Key words: transpiration cooling, formed platelet, thermal wrinkling, rocket engine, thermal stress