Jet flow impact force characteristic testing device and testing method

Abstract

The invention belongs to the technical field of impact force characteristic testing, and particularly discloses a jet flow impact force characteristic testing device and testing method. The testing device mainly comprises an I-Scan pressure sensing piece, an I-Scan signal receiver, an information processing unit, an impact force testing kettle, a spraying pipe, at least two pressure relief valves,and the like. The device is wide in application range, the requirements of most jet flow impact force tests can be met. The testing method is convenient to operate. Meanwhile, the pressure bearing problem of the sensor under a submerging condition is also solved. The defect that the I-Scan pressure sensing sheet is easy to damage is overcome. The use range of the I-Scan pressure test system is expanded, the functional advantages of I-Scan are brought into play to a greater extent, and the device not only can measure the pressure distribution within the impact range, but also can measure the jet flow impact force characteristics such as the impact frequency, the impact contact area, the peak pressure and the like.

Description

technical field [0001] The invention belongs to the technical field of impact force characteristic testing, in particular to a jet impact force characteristic testing device and testing method. Background technique [0002] At present, most of the impact test equipment use pressure sensors and can only measure the size of the impact force. However, there are still difficulties in the impact force test of some special technologies, such as jet flow technology, which has a wide impact range and large impact force. Uniformity, and even need to be tested under submerged conditions. At present, the principle of pitot tubes is mostly used to install multiple pressure sensors for testing, but the device layout used in this method is cumbersome, and there are too few sampling points, so accurate data cannot be obtained; In addition, There is also a method of using pressure measuring film (pressure-sensitive paper) to measure the impact force. The principle is: when the impact occurs...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the impact test equipment use pressure sensors and can only measure the size of the impact force. However, there are still difficulties in the impact force test of some special technologies, such as jet flow technology, which has a wide impact range and large impact force. Uniformity, and even need to be tested under submerged conditions. At present, the principle of pitot tubes is mostly used to install multiple pressure sensors for testing, but the device layout used in this method is cumbersome, and there are too few sampling points, so accurate data cannot be obtained; In addition, There is also a method of using pressure measuring film (pressure-sensitive paper) to measure the impact force. The principle is: when the impact occurs, the microcapsules rupture, the chromogenic substance and the chromogenic substance react with each other, and a red area appears on the film, and the color density increases with the If you want to extract accurate values, you need to use a pressure analysis system. This method is easy to operate, and the pressure measurement film can be pasted at any position. It is widely used in automobile safety crash experiments , Bolt fastening pressure measurement, etc., and also used for the test of jet impact force, but the shear force formed after jet impact is relatively large, which is easy to destroy the pressure measurement film. If a protective layer is applied, the measurement result will be inaccurate. And the color reaction is an irreversible process, so its measured value is the peak pressure during the entire test process, which cannot accurately reflect the impact characteristics of the flow

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