Low speed wind tunnel with adjustable moving boundary

摘要

A low speed wind tunnel with an adjustable moving boundary is disclosed. The wind tunnel comprises a wind tunnel test section having at least one movable wall installed therein. The movable wall is capable of moving with the same direction and speed of the air flow. The movable wall may be a roller tread or a roller belt. A nested filter is installed at an inlet site of the air flow for regulating a source air flow into an evenly distributed flow field which is then sent to the wind tunnel test section. The nested filter includes a plurality of nested units arranged in order. Each nested unit has an air flow cross. section adjustable structure for varying the cross section area of the air flow passing through the wind tunnel test section, thereby adjusting the speed of the air flow. The movable wall may be designed to be an adaptive boundary for corresponding with different shapes of objects under test located in the wind tunnel test section.