Combustion chamber design for efficient heat transfer

A combustion chamber of an engine operating at really high temperature expels a hot stream of gas and thus, may be equipped with a cooling device. To achieve a lower temperature around the combustion chamber, a valve facing the combustion chamber in which engine oil is circulated with the help of valve stems which are equipped with oil introduction channels may be used or alternatively, the combustion chamber may have depressions formed in such a way that the stable outer layer of the stream of gas that that is formed around the inner wall of the combustion chamber is hydrodynamically destabilized in the area of the depressions during the operation of the engine.