River channel bluff body flow-around lift-resistance curve measuring device and testing method

The invention relates to a riverway bluff body flow-around lift-resistance curve measuring device and method, the measuring device comprises a force measuring straight quadrangular prism, two ends of the force measuring straight quadrangular prism are provided with connecting parts, one end of the force measuring straight quadrangular prism is fixedly connected to an external reference object through the connecting parts, and the other end of the force measuring straight quadrangular prism is fixedly connected with a tested bluff body submerged in water; according to the water flow direction, strain gauges are arranged on the surfaces of the force measuring straight quadrangular prism in the front, back, left and right directions respectively, the strain gauges in the front and back directions are located in the incoming flow direction, and the strain gauges in the left and right directions are perpendicular to the incoming flow direction; the strain gauges are connected with a dynamic strain tester through l