Quiet Electrical cooling Fan module (Qe-FAN)

社会对电动汽车的可接受性要求提高这些车辆的自主性和快速充电。为了提高自主性，必须降低传统的热通风空调系统的消耗，这就需要热泵和整体更强大的风扇系统。为了减少充电时间，需要在车辆发动机舱内和车辆充电站上散发更多的热量，这再次要求更强大的冷却通风系统。在这两种情况下，噪音明显增加，在城市地区和夜间最为明显。因此，该项目建议设计电冷却模块，通过结合风扇噪声的主动和被动控制，在声学上进行优化，以满足城市地区目前的噪声规范。该方法也将是创新的，将依赖于完整模块的直接航空声学模拟的原始组合，其尺寸将被参数化，并可在计算机辅助设计软件中自动调整。为了有效地计算这种复杂系统的噪声，选择了格子玻尔兹曼方法，因为它是目前在低速应用中获得声学特征的最有效的模拟技术。这种方法将允许快速地测试模块和风扇的形状参数，并且因此测试各种被动降噪技术，以产生比初始模块显著更安静的最终原型。将同时使用几种实验性航空声学方法来验证新概念。

Acceptability of electrical vehicles by the society requires an increase of the autonomy and a quick charge of these vehicles. To increase the autonomy, the consumption of the classical heat and ventilation air-conditioning system must be reduced, which calls for the need of a heat pump and an overall more powerful fan system. To reduce the charging time requires to dissipate more heat in the vehicle underhood compartment and on the vehicle charging station, which again calls for more powerful cooling ventilation systems. In both cases, noise is significantly increased, most noticeably in urban areas and at night. The project thus proposes to design electrical cooling modules that are optimized acoustically to meet present noise specifications in urban zones, by combining both active and passive control of fan noise. The methodology will also be innovative and will rely on an original combination of direct aeroacoustic simulations of full modules, the dimension of which will be parametrized and can be adjusted automatically within the Computer-Aided Design software. To efficiently compute the noise of such complex systems, the Lattice Boltzmann Method is selected as it is presently the most efficient simulation technique to obtain acoustic signature in low speed applications. Such a method will allow to quickly iterate on the shape parameters of the module and the fan, and therefore to test various techniques of passive noise reduction to yield a final prototype that is significantly quieter than the initial module. Several experimental aeroacoustic methods will be used in parallel to validate the new concepts.