虚拟仪器在汽车尾流测量中的应用

Application of virtual instrument in wake measurement of road vehicle

为有效地进行汽车尾流速度测量进而弄清汽车尾流结构特性,在热线风速测量的基础上,针对传统测试仪器功能单一固定、开发周期长、价格昂贵且不易维护升级的弊端,引入虚拟仪器的概念,用NI公司的LabVIEW软件,通过可视化编程,为汽车风洞开发了尾流速度测量虚拟仪器系统,弥补了尾流测试设备在开发、维护以及升级等方面的不足。使用该系统进行某国产轿车尾流速度测量试验,所得结果与先前进行的试验研究和数值计算结果均保持一致,证明了虚拟仪器的有效性。

In order to measure the velocity distribution in the wake of a driving vehicle to clarify the wake structure, considering the shortcomings of the traditional test instruments including their function singularity, tedious development, high price, and difficult maintenance and update, the concept of virtual instrument was introduced, and a virtual instrument system was developed based on hot-wire anemometer to measure the wake velocity distribution of the road vehicles in the automotive wind tunnel by means of visual programming through LabVIEW software, a product of National Instrument Company, USA. With this system, being without the deficiencies of the traditional instruments in the aspects of development, maintenance and update, experiments were made to gain the wake velocity distribution behind a certain car made in China, and the results are in accordance with those of the numerical simulation and the former experimental research, validating the virtual instrument system.