High efficiency heat transfer structure

摘要

A heat transfer structure for the efficient cooling of a heated surface such as the combustor wall of a gas turbine has a high heat transfer coefficient and can therefore operate at a relatively low pressure loss. A cooling jacket is formed around the heated surface by means of an apertured wall parallel to and spaced from the heated surface. Cooling fluid such as air flows into the cooling jacket through the apertures and impinges as air jets on the heated surface. The heat transfer coefficient is greatly increased by flow diversion features associated with the apertures which act as Coanda surfaces to divert the air jets so that they impinge obliquely and turbulently on the heated surface and establish subsequent turbulent sinuous cross-flows of the cooling air on the heated surface.