Air curtains is promising in reducing the short-range infection risk in hospitals. To quantitatively evaluate its performance, this paper explores air curtains equipped on normal consulting desk to avoid doctor’s direct exposure to the patient exhaled pollutants. A numerical investigation is conducted to evaluate the effects of supply air velocity and angle on cutting off performance. Simulation results show that the average mass fraction of exhaled pollutants decreases significantly (70%–90%) in the consulting ward, indicating satisfying performance of air curtains. Increasing supply air velocity is demonstrated to be conducive in forming full air curtains, whereas an excessively high supply air velocity may be of adverse effects by entraining exhaled flow. Besides, the supply air angle is also critical due to its coupling with supply air velocity. It is found that larger angle (0°–40°) is better where velocity is less than 3 m/s, otherwise a small angle (20°) is preferable where velocity is larger than 3 m/s. Exhaled flow could be well suppressed at the supply air angle 20° but moves over air curtains at 40°. This study can provide effective and intuitive guidance in applying air curtains in consulting wards.

气幕有望降低医院的短程感染风险。为了定量评估其性能，本文探讨了在普通咨询台上配备的空气幕，以避免医生直接接触患者呼出的污染物。进行数值研究以评估送风速度和角度对切断性能的影响。模拟结果表明，咨询病房呼出污染物的平均质量分数显着降低（70%~90%），表明空气幕的性能令人满意。增加送风速度被证明有利于形成完整的空气幕，而过高的送风速度可能会因夹带呼出气流而产生不利影响。除了，送风角度也很关键，因为它与送风速度有关。发现在速度小于 3 m/s 的情况下，较大的角度（0°~40°）更好，反之，在速度大于 3 m/s 的情况下，较小的角度（20°）更好。呼出气流可以在 20° 的送风角度得到很好的抑制，但在 40° 的空气幕上移动。本研究可为咨询病房应用风幕提供有效、直观的指导。