Heat exchanger and turbine engine comprising such an exchanger

The invention relates to a heat exchanger (10) for heat-exchange between a first fluid and a second fluid. The heat exchanger comprises a membrane separating the two fluids and a heat-conductive element (17) in thermal contact with the membrane and with the first fluid, characterized in that the heat-conductive element (17) moves between an active position and an inactive position, such that the capacity of heat exchange with the first fluid is weaker in the inactive position than in the active position. The exchanger is applied, in particular, for the cooling of fluid in the secondary stream of a turbofan. 本发明涉及种用于第流体和第二流体之间的热交换的热交换器(10)，热交换器包括将两种流体分开的膜以及与膜和第流体热接触的热传导元件(17)，其特征在于，所述热传导元件(17)在活动位置和不活动位置之间移动，使得热传导元件在不活动位置与第流体热交换的能力弱于在活动位置与第流体热交换的能力。该交换器尤其用于冷却涡轮机的次级流中的流体。