The possible factors causing the windward wind speed direction to be greatly inwardly biased are the internal airflow short circuit, the influence of the surrounding large flow field, and the local structure of the tuyere. Now, the experimental methods are used to eliminate and determine one by one. First of all, the cross-flow fan cavity and the main fan cavity may be together, causing the internal airflow to be short-circuited. The airflow along the air curtain tuyere> the main fan air outlet one> the main fan cavity one> the air curtain fan cavity> wind The curtain vent forms a closed loop.
After the fan casing was disassembled, it was found that there was a connection between the cross-flow fan cavity and the main fan cavity. After the transformation, the main fan cavity and the air curtain fan cavity were completely blocked, eliminating the internal airflow short circuit phenomenon. Continuing the experiment, it is found that there is still a fairly obvious phenomenon that the wind curtain deflects inwardly, which means that only a small part of the airflow is flowing along the short-circuit route due to the communication of the two fan cavities, and the internal airflow short-circuit does not cause the wind curtain direction. The main cause of internal deflection.
The large indoor large flow field may form a negative pressure zone in the lower part of the main fan, taking into account the possible local structure of the air curtain tuyere, and the latter is more likely. In order to determine these two possibilities, we A vertical strip of Zcm is attached to the semicircular strip behind the air curtain vent. If the large flow field causes the wind speed to deflect and the local structure of the tuyere changes, the direction of the wind speed will not be too large. The change, if it is the deflection of the wind speed caused by the local structure of the tuyere, indicates that the local structure of the tuyere is the decisive cause of the deflection of the air curtain airflow.
After the smoke test, the airflow velocity of the modified tuyere is vertically downward. Therefore, it is determined that the deflection of the air curtain to the main fan is caused by the partial structure of the air curtain tuyere. In the middle is a cross-flow fan, the air is blown by the action of the cross-flow fan. After the air outlet, there is a strip with irregular cross-section, the inside is a vertical plane matched with the cross-flow fan, and the outer semi-circular arc surface Docked. We believe that the airflow deflection caused by the cross-flow fan and the arc-shaped strip together.
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