Experimental pressure measuring device in adverse environment
A harsh environment, measuring device technology, used in measuring devices, measuring fluid pressure, instruments, etc., can solve the problems of three-phase voltage imbalance and low precision, and achieve the effect of eliminating noise and voltage interference, and solving long-line drive and impedance matching.
Inactive Publication Date: 2008-08-06
HARBIN INST OF TECH
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However, during the experiment, the plasma arc temperature was as high as 2500-3000°C, and the operating voltage of the heater was in the range of 3000-10000VAC. Because the heater itself required that its three-phase neutral point could not be grounded for protection, and due to physical conditions (three-phase heater Voltage imbalance) The voltage of the theoretical neutral point is not zero, and the space electromagnetic field will change greatly when the heater starts and stops to form electromagnetic interference, resulting in the flow field pressure measurement device being in an ultra-high temperature, strong electricity and large in a noisy environment
To realize the measurement of the arc flow field pressure in such a harsh flow field environment, the commonly used method is to measure the heater gas source pressure and calculate the mechanical parameters of the heater gas path to initially obtain the arc flow field pressure. The method is that the accuracy of a large number of external factors is quite low
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[0015] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0016] The composition of the experimental pressure measurement device in a harsh environment includes a heating body 1, an air inlet is opened on the heating body, and an air guide pipe 5 is connected to the air inlet hole. And in the water outlet part 3 with the water outlet hole and the water flow channel, the water inlet part, the water outlet part and the heating body are connected to each other, and the water flow channel is provided with a water retaining plate 2 that separates the water flow channel into inner and outer channels, and the air guide tube is connected behind A gas pressure sensor 7 that can convert the air pressure signal into an analog voltage signal. The analog voltage signal is converted into a digital signal by an analog power acquisition device. After passing through the photoelectric isolation device 8, the digital signal is uploaded to ...
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A device for measuring test pressure in adverse circumstance consists of heating body with air inlet hole, air guide tube connected to said hole and set in water -in and water-out component being set with water inlet hole and water flowing channel, water baffle plate for isolating water flowing channel to be internal and external channel, air pressure transducer for converting air pressure signal to be analog voltage signal, analog electric amount collection unit for converting analog signal to be digital signal and computer for receiving digital signal send through signal line according to RS-485 asynchronous serial communication rule .
Description
(1) Technical field [0001] The invention relates to a pressure measuring device, in particular to a device capable of measuring ultra-high temperature arc pressure in an environment of high temperature, strong electricity and strong interference. (2) Background technology [0002] In the ground simulation experiment system of heat-resistant materials with the plasma arc heater as the core, the influence of the pressure of the experimental arc on the experimental results is very significant. To analyze the ablation mechanism of the test piece and assess the ablation performance of the test piece, it is very important to measure the arc pressure during the experiment. However, during the experiment, the plasma arc temperature was as high as 2500-3000°C, and the operating voltage of the heater was in the range of 3000-10000VAC. Because the heater itself required that its three-phase neutral point could not be grounded for protection, and due to physical conditions (three-phase ...
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IPC IPC(8): G01L19/00G01L19/06
Inventor 杜善义白光辉易法军张冬梅
Owner HARBIN INST OF TECH