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SummaryThis report highlights the results of a project carried out at the National Research Council of Canada (NRC), with the overall objective to address the major issues of the Li-air battery technology and assemble a multi-electrode pilot-scale prototype. Several innovative ideas and technologies were investigated along the core concept of a polymer-based solid-state technology. The assessment of the Li-air technology is discussed through the results of the project as well as other sources, especially concerning its readiness and perspectives for automotive applications.

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A domestic SUV model was selected, and two different side wind simulation methods of “partial car” and “partial wind” were analyzed to numerically simulate the flow field of SUV under different intensity of side wind, and the velocity-pressure distribution and aerodynamic force of the flow field under different side wind intensity were obtained. coefficients under different side wind strengths. The wind tunnel test was conducted at the same time, and the simulation results were compared and analyzed with the test results. The analysis results show that: the results of the two simulation methods are close to each other, and the trend is the same as that of the test, which is that the aerodynamic drag, lateral force and lift force gradually increase with the increase of the side yaw angle; considering the operation and difficulty of model building, the side wind simulation method is recommended to “deflect the wind”; the pressure maps of different parts of the body are analyzed to qualitatively The pressure maps of different parts of the body are analyzed to qualitatively explain the effect of side wind on the aerodynamic characteristics of SUV, which provides a reference for further research on the aerodynamic characteristics of SUV under the influence of side wind.

In order to improve the heat dissipation performance of the brake disc and reduce the air drag coefficient of the vehicle, the influence mechanism of the front wheel air dam and brake cooling guide structure is studied. Firstly, according to the flow field around the front wheel, six feasible air dam and guide flow optimization solutions are designed; then, CFD simulation method is used to simulate the flow rate, heat transfer coefficient and cooling time; secondly, for the air drag coefficient and brake cooling time of the whole vehicle, aerodynamic-acoustic wind tunnel and road test are used to test and verify respectively; finally, we get the solution of small front wheel air dam and open a guide flow channel around the plate (solution 4), the air drag coefficient is only increased by 3ct, and the brake cooling performance is much better.