作为道路驾驶的模拟，全尺寸车辆的风洞试验会在空气动力、空气动力矩和表面压力方面产生一定的误差。这些误差的大小通常取决于以下因素:a.）流动质量，b.）参考动压的确定，c.）风洞地板边界层，d.）试验段几何形状和车辆在该几何形状内的位置，e.）车辆形状，f.）堵塞率:车辆横截面积与风洞喷嘴横截面积之比，g.）车轮旋转，h.）模型中的内部流动。SAE标准委员会“开喉风洞调整”的目标是记录模型干扰对汽车开喷风洞风洞试验结果影响的知识。 本文件包含与本主题相关的以下信息:a.）开喉风洞的设计数据，b.）已发布和未发布试验数据的总结，c.）汽车试验各种堵塞校正程序的文件和理论解释，d.）堵塞校正程序的关键评估，尤其是与其他影响相关的评估，例如试验段几何形状、轿厢位置、地板边界层等，以及e.）确定堵塞效应和每个单独风洞中其他影响的校准程序建议。

As a simulation of road driving, wind tunnel testing of full-size vehicles produces certain errors in the aerodynamic forces, aerodynamic moments, and surface pressures. The magnitude of these errors, in general, depends on the following: a.) Flow quality, b.) determination of the reference dynamic pressure, c.) Wind tunnel floor boundary layer, d.) test section geometry and position of the car within that geometry, e.) shape of the vehicle, f.) Blockage ratio: The ratio of the cross-sectional area of the vehicle to the cross-sectional area of the wind tunnel nozzle, g.) Wheel rotation, and h.) Internal flow in the model.The SAE Standards Committee, Open Throat Wind Tunnel adjustments, had as a goal to document the knowledge of the influence of model interference on wind tunnel test results for automotive open jet wind tunnels. This document contains the following information related to this subject: a.) Design data of open throat wind tunnels, b.) A summary of published and unpublished test data, c.) Documentation and theoretical explanation of various blockage correction procedures for automotive tests, d.) Critical evaluation of blockage correction procedures, especially in relation to other influences, such as test section geometry, position of the car, floor boundary layer, etc., and e.) recommendation of a calibration procedure to determine the effect of blockage and other influences in each individual wind tunnel.