计量用低速风洞结构参数仿真研究

Simulation Research on Structural Parameters of Low Velocity Wind Tunnel for Metrology

摘要:

为准却分析风洞结构参数对所产生的风场稳定性的影响规律，以现有低速风洞为蓝本，通过改变其试验段结构参数建立多个不同参数试验模型；采用ansys CFD对建立的多个新模型进行结构流体仿真，对仿真结果进行数据拟合，找出风洞收缩段曲线结构参数变化对试验段轴向风速梯度和法向风速均匀性的影响；仿真实验结果表明，试验段法向中心面的有效试验区的均匀性系数随着收缩段长度增加而减小，到一定程度趋于稳定，风洞模型在L>23cm后风场均匀性系数基本处于稳定，试验段前半段的风速轴向梯度明显大于后半段的风速轴向梯度，有效试验区域多集中在后半段，风洞模型中轴向有效试验区域x>（10～15）cm，可以为风洞的设计提供可靠参考。

Abstract:

In order to analyze the influence of the structural parameters of the wind tunnel on the stability of the generated wind field, based on the existing low-speed wind tunnel, establish multiple test models with different parameters by changing the structural parameters of the test section；Ansys CFD is used to simulate the structure of multiple new models, and the simulation results are fitted to the simulation results to find out the influence of the changes in the structure parameters of the wind tunnel contraction section on the axial wind speed gradient and the normal wind speed uniformity；The simulation experiment results show that the uniformity coefficient of the effective test area of the normal center plane of the test section decreases with the increase of the length of the contraction section, and stabilizes to a certain extent. The wind tunnel model has a basic uniformity coefficient of the wind field after L>23cm Isstable, After the wind tunnel model L>23cm, the wind field uniformity coefficient is basically stable. Theaxial gradient of wind speed in the first half of the test section is obviously greater than that in the second half. The effective test area is mostly concentrated in the second half. The wind tunnel model The effective test area of the central axis x>(10～15)cm can provide a reliable reference for wind tunnel design。