The automobile exhaust was approximately 30 0–50 0 kPa in pressure and 500 –70 0 1C in temperature when just discharged from the engine cylinder [8], the gas inlet temperature is set to 400 1C, which can take advantage of the performance of TEMs applied in the TEG. Base on the working operating characteristics of the engine, the inlet flow velocity can reach 20 m/s. Considering the acoustic attenuation performance of the TEG, the traditional muffler is replaced on the test bench [9]. The outlet of the mixing flow use the pressure boundary condition, the gauge pressure at the outlet is set to 0 Pa. In addition, the heat transfer coefficient between the external surface of the heat exchanger and the air is set to 20 W/(m2K) with the environmental temperature is set to 25 1C.