A device and method for measuring the speed of the end of a piston compression tube
A technology of terminal speed and measuring device, which is applied in the direction of measuring device, the device used to measure the time required to move a certain distance, and the testing of machine/structural components. sexual issues
Active Publication Date: 2022-07-05
中国空气动力研究与发展中心超高速空气动力研究所
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Problems solved by technology
However, when the sensor is used for measurement, since the end of the piston compression tube needs to withstand high temperature and high pressure compressed gas, based on strength considerations, it is impossible to arrange too many measuring points at the end of the piston compression tube, thus reducing the accuracy of speed measurement
However, when the non-contact method based on laser Doppler technology is used for measurement, when the free piston moves to the deceleration stage at the end of the piston compression tube, the complex flow process of the gas driven in the piston compression tube (high temperature, high pressure, relatively fast change process, turbulent flow characteristics etc.) and the impact of measurement technology defects, the speed at which the piston at the end of the compression tube cannot be measured
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[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0044] like Figures 1 to 5 As shown, the piston compression tube end speed measuring device includes a measuring sensor group 1, a front cover plate 2 of the mounting seat, a bottom cover plate 3 of the mounting seat, a mounting seat 4 and an outer spring 5. The measuring sensor group 1 is composed of a short measurement The sensor 11, the middle measurement sensor 12 and the long measurement sensor 13 are composed of the short measurement sensor 11, the middle measurement sensor 12 and the long measurement sensor 13. The extension lengths of the measurement rods can be adjusted, and the extension lengths of the measurement rods of each measurement sensor are different; , the measuring sensor group 1 is installed in the installation groove on the mounting seat 4, and the outer spring 5 is arranged between the measuring sensor group 1 and the ...
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The invention discloses a device and method for measuring the speed of the end of a piston compression tube. The device for measuring the speed of the end of a piston compression tube comprises a measuring sensor group, a front cover plate of a mounting seat, a bottom cover plate of the mounting seat, a mounting seat and an outer spring, and a measuring sensor The group consists of a short measuring sensor, a medium measuring sensor and a long measuring sensor, and the measuring rods of each measuring sensor have different and adjustable extension lengths. The method for measuring the speed of the end of the piston compression tube is based on the protruding length L of each measuring rod of the measuring sensor group. 1 , L 2 and L 3 , and install the sensor group on the diaphragm ring. When the piston strikes, the sensors with different extension lengths of the measuring rod feel the piston strikes at different times. Combined with L 1 , L 2 and L 3 and different sensor impact time t 1 , t 2 and t 3 , the piston collision speed can be calculated, which is the average speed of the piston at the end of the piston compression tube. The invention can accurately measure the impact speed of the free piston at the end of the piston compression tube.
Description
technical field [0001] The invention belongs to the field of wind tunnel pistons, and in particular relates to a device and method for measuring the speed of the end of a piston compression tube. Background technique [0002] In the free-piston-driven shock tunnel and the expansion-tube wind tunnel, the free piston is used to compress the driving gas in the wind tunnel to achieve a high-temperature and high-pressure driving state. The movement speed of the free piston in the piston drive has an important influence on the driving performance and the safety of the equipment. Accurately measure the running speed of the free piston in the piston compression tube, especially the speed at the end of the piston compression tube (also called the collision speed), It is of great significance to the safe commissioning of wind tunnels and the prediction of wind tunnel performance. [0003] In order to measure the motion speed of the free piston in the compression tube, two methods are...
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IPC IPC(8): G01M9/06G01P3/64
CPCG01M9/06G01P3/64
Inventor 吕治国赵荣娟周嘉穗孔荣宗罗义成
Owner 中国空气动力研究与发展中心超高速空气动力研究所