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As the commercial vehicle increases staggeringly in China, environmental pollution and excessively fuel consumption can't be neglected anymore. Vehicle thermal management has been adopted by many vehicle manufactures as an ideal alternative to reduce fuel consumption and exhaust emission by its cost-efficient and effective merit. In addition, the components in heavy duty commercial vehicle engine hood may suffer overheat harm. Hence investigating the thermal characteristics in engine hood can be an effective way to identify and dismiss the potential overheat harm. In terms of this, the paper has adopted CFD simulation method to obtain the comprehensive thermal flow field characteristics of engine hood in a heavy commercial vehicle. Then by analyzing the thermal flow field in engine hood, concerning optimization strategies were put forward to improve the thermal environment.

As an important part of the Roots hydrogen circulation pump, the rotor system has a significant impact on the dynamic characteristics of the Roots hydrogen circulation pump. In this paper, the finite element model of the rotor system of the Roots hydrogen circulation pump in the fuel cell hydrogen supply system was built, and the dynamic characteristics of the coupled dual-rotor system were studied. Through the modal analysis of the rotor system, the first six-order natural modes and natural frequencies of the uncoupled single-rotor system and the coupled dual-rotor system were obtained. The harmonic response characteristics of the rotor system were analyzed on the basis of the modal analysis, and the harmonic response characteristic curves of the gear and the edge of the impeller were obtained.