Thermal flow density measuring device under adverse environment experiment

Abstract

A measuring device for testing thermal flow density under adverse circumstances consists of heating element, probe core, water pipe, industrial thermocouple set at thermal flow incoming end, water in and water out head connected through to cavity formed by water pipe and probe, cooling water channel in heating element, water incoming element and water outgoing element connected separately to internal channel and external channel of heating element, thermocouple signal collection unit being used to transmit its signal to computer through signal line according to RS-485 asynchronous serial communication rule .

Description

(1) Technical field [0001] The invention relates to a measuring device, specifically a device capable of measuring the heat flux density of an ultra-high temperature arc in an experimental 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 heat flux density of the experimental arc has a significant influence on the experimental results. 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 heat flux density 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 cannot be grounded for protection, and due to physical...

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Problems solved by technology

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 cannot 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

In order to realize the measurement of arc flow field heat flux density in such a harsh flow field environment, the commonly used method is to measure the pressure of the heater gas source, supplemented by the calculation of the mechanical parameters of the heater gas circuit and the power of the power supply, and initially obtain the heat flow of the arc flow field. density, but this method is affected by a large number of external factors and the accuracy is quite low

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