Beschreibung:
Inner topology optimization of heat exchanger enhances the performance of automobile exhaust thermoelectric generator (AETEG), while the added heat exchanger will result in undesired backpressure and change the original performance of internal combustion engine (ICE). To evaluate the performance interaction between AETEG and ICE, the heat exchangers with chaos shape, fishbone shape and empty cavity shape were fabricated, and the comprehensive numerical model of ICE and AETEG was established and validated with test setup. The results demonstrate that the backpressure of heat exchanger is mainly affected by the ICE operating condition and its inner topology, and the backpressure of chaos-shaped heat exchanger is the largest under the same ICE operating condition. The increased backpressure contributes to the increased maximum power and hot side temperature of AETEG, and the decreased brake torque, brake power, volumetric efficiency, pumping mean effective pressure and fuel economy of the ICE. Moreover, compared with the ICE without AETEG, the emission of CO, CO 2 , NO X and smoke opacity in the ICE added with chaos-shape, fishbone-shape and empty cavity shape heat exchanger reduce. This work provides a numerical investigation guide to the design, optimization and performance analysis of AETEG without obviously deteriorating the ICE performance