汽车气动升力风洞试验值的修正方法

摘要

[ Abstract] Both numerical simulation and wind tunnel test are conducted to study the additional lift genera-ted by moving belts in automotive wind tunnel with the simulation and test results obtained in terms of the static pressure coefficients and lift coefficients of front and rear belts. It is found by the numerical simulation on the change in the static pressure coefficients of moving belts between stationary and moving conditions that the additional lift coefficient of front belt in moving condition is only 0.004 larger than that in static condition while it is 0.008 lar-ger for rear belt. By combining the test data in stationary condition with the numerical simulation results in both sta-tionary and moving conditions, the correction formulae for the aerodynamic lift coefficients of automotive wind tunnel in moving condition are given and hence the real lift coefficient of tested vehicle can be obtained.%分别采用数值模拟和风洞试验,研究汽车风洞移动带产生的附加升力,获得前后轮移动带静压系数和附加升力系数的数值模拟和试验结果。接着通过对静止和运动工况移动带静压系数变化的数值模拟,发现由静止工况变为运动工况后,前轮带的附加升力系数仅增加0郾004,而后轮带增加0郾008。结合静止工况的试验数据和静止与运动工况的数值模拟结果,给出了运动工况汽车风洞气动升力系数的修正公式,从而可获得被测车辆的真实升力系数。