Drag testing apparatus with variable flow field curvatures and jet angles

A drag testing apparatus with variable flow field curvature and jet angle, comprising:

• a main flow field supply device, a main flow field flow control device, a biomimetic circular test hose, a main flow field curvature adjustment device, a jet supply device, a jet flow control device, a multi-directional jet angle adjustment device, a pipe telescoping device, and a drag testing device, wherein
• a liquid outlet of the main flow field supply device is connected to a liquid inlet of the main flow field flow control device, a liquid outlet of the main flow field flow control device is connected to a liquid inlet of the biomimetic circular test hose, a liquid outlet of the biomimetic circular test hose is connected to a liquid inlet of the pipe telescoping device, and a liquid outlet of the pipe telescoping device is connected to a water tank;
• the biomimetic circular test hose is provided inside the main flow field curvature adjustment device;
• a liquid outlet of the jet supply device is connected to a liquid inlet of the jet flow control device, a liquid outlet of the jet flow control device is connected to a liquid inlet of the multi-directional jet angle adjustment device, a liquid outlet of the multi-directional jet angle adjustment device is connected to one or more jet hole inlets on the biomimetic circular test hose, and the multi-directional jet angle adjustment device is installed on the main flow field curvature adjustment device;
• the liquid inlet and the liquid outlet of an inner wall of the biomimetic circular test hose are provided with the drag testing device, respectively;
• the multi-directional jet angle adjustment device comprises a plurality of springs, a plurality of suspension rings, an upper cover plate, a sliding block, a threaded rod, a sliding block press plate, a threaded rod press plate, an internal threaded block, a base, a rotating outer ring, a conical roller bearing, and a fixed inner ring, wherein
• a bottom circular convex platform of the base is connected to the main flow field curvature adjustment device, the sliding block press plate, when assembled with the base, forms a sliding groove, the sliding block is installed in the sliding groove and is configured to slide along a circumferential direction, a center of the sliding block is provided with a threaded through-hole, the threaded rod is installed in the threaded through-hole of the sliding block through a threaded connection and is configured to move along an axial direction by rotating the threaded rod;
• an outer convex platform of the rotating outer ring is provided with a blind hole, a top of the threaded rod is connected to the internal threaded block, the internal threaded block is connected to the blind hole through the threaded rod press plate, a stepped hole is provided inside the rotating outer ring, an outer side of the conical roller bearing is assembled with an upper end hole of the rotating outer ring, and the fixed inner ring is in a stepped shaft shape with two sections, and a circular through-hole is provided inside the fixed inner ring;
• a lower end shaft of the fixed inner ring is assembled with an inner hole of the conical roller bearing to ensure that the fixed inner ring remains stationary when the rotating outer ring rotates through the conical roller bearing;
• a liquid inlet at an upper end of the circular through-hole of the fixed inner ring is adhesively connected to the telescopic hose through waterproof sealing glue, and a liquid outlet at a lower end of the circular through-hole of the fixed inner ring is adhesively connected to a jet telescopic hose through the waterproof sealing glue;
• an outer convex platform of the fixed inner ring is provided with a plurality of threaded holes, four of the plurality of suspension rings are connected to the fixed inner ring through the plurality of threaded holes on the outer convex platform of the fixed inner ring, and the four of the plurality of suspension rings are installed on the fixed inner ring in a circular arrangement at intervals of 90°;
• an inner convex platform of the upper cover plate is also provided with a plurality of threaded holes, another four of the plurality of suspension rings are connected to the upper cover plate through the plurality of threaded holes on the inner convex platform of the upper cover plate, and the another four of the plurality of suspension rings are installed on the upper cover plate in a circular arrangement at intervals of 90°;
• the plurality of springs are configured to connect the upper cover plate and the fixed inner ring through the four of the plurality of suspension rings installed on the upper cover plate and the another four of the plurality of suspension rings installed on the fixed inner ring, and the plurality of springs are configured to support the fixed inner ring;
• the base is connected to the upper cover plate;
• a position of the fixed inner ring is changed by a sliding of the sliding block in the sliding groove along the circumferential direction and a movement of the threaded rod along the axial direction adjusted by a rotation of the threaded rod, such that the jet angle of the jet telescopic hose is changed;
• and
• different jet angles are formed in any direction through mutual coordination between the sliding block and the threaded rod.