Sensor fixture for direct measurement of dynamic resistance of a shock-loaded model spherical array

Abstract

The invention discloses a sensor fixing device for direct measurement of shock wave loading model ball array dynamic resistance. The sensor fixing device comprises a high-pressure air source, a driving section, a diaphragm and a driven section, wherein one end of the driving section and one end of the driven section are connected through the diaphragm to form a shock wave tube, the high-pressure air source is connected with the other end of the driving section, and one end of an experimental section is connected with the other end of the driven section. Two serially-connected model balls in the same structure are arranged inside the experimental section, accelerometer sensors are respectively arranged inside the two model balls, a metal wire of one model ball is fixed through a fixing ball, a metal wire of the other model ball is led out from a rectangular groove of the experimental section and is connected with a force sensor fixing device, the two model balls are connected with a high-speed data collecting system through signal wires, and a force sensor in the force sensor fixing device is connected with the data collecting system. The sensor fixing device has the advantages that the precise and complete direct measurement of the shock wave loading model ball array dynamic resistance is realized, and the mutual verification and the mutual supplement can be realized.

Description

technical field [0001] The invention relates to an experimental device for measuring force, in particular to a sensor fixing device for direct measurement of the dynamic resistance of a shock wave loaded model ball array. Background technique [0002] The phenomenon of supersonic gas-solid two-phase flow has important applications in many industrial productions, involving many fields such as medical and health, clean energy, safety prevention and control, and aerospace. Spraying etc. The key issue in carrying out research on gas-solid two-phase flow induced by shock waves is to clarify the interaction mechanism between shock waves and model spherical arrays and to summarize the influence laws of unsteady forces, which mainly rely on specially designed experimental devices and model ball. Comparative literature [Shock wave interaction with a sphere in a shock tube][J]. Shock Waves (2004) 3: 22-24 Connecting two hemispheres with countersunk bolts to form a model ball serious...

AI Technical Summary

Problems solved by technology

Comparative literature [Shock wave interaction with a sphere in a shock tube][J]. Shock Waves (2004) 3: 22-24 Connect two hemispheres with countersunk bolts to form a model ball, which seriously destroys the spherical geometry and damages The structure of the shock wave and the airflow after the wave has been clarified; Chinese patent 201210091206.0 and Chinese patent 201210091207.5 have a hole 0.3mm larger than the diameter of the metal wire in the experimental section of the metal wire. When the model ball moves under force, the hole hinders the metal The movement of the wire causes the force distortion of the model ball. Chinese patent 201210091206.0 uses oil to trigger the force sensor. According to the nature of the force sensor, the center of the force sensor is triggered by pressure, and the surrounding trigger is tension. The contact area between the oil and the trigger surface of the sensor If it is too large, the pressure and tension will be mixed, and the experimental data will be inaccurate. In addition, the connecting rod is fully threaded, and the friction between the connecting rod and the upper bottom plate is very large when it moves, resulting in distortion of the experimental data.

Images