Interfere reduced enthalpy probe for measuring jet parameters of fluid at superhigh temperature

Abstract

A probe of enthalpy disturbance reducing type for measuring efflux parameter of super high temperature flow air is prepared as sheathing probe internal tube in probe rod internal tube, inserting a water in and water out separation tube between said internal tube and external tube, setting said three tubes coaxially, installing a removable shell conical head cover on said external tube head and opening round hole at centre of said cover, coordinating said cover to said internal tube by thread and presenting said separation tube head to be conical form .

Description

technical field [0001] The present invention relates to a probe for measuring the temperature, velocity, composition and distribution of ultra-high temperature flowing gas jet, in particular to a probe for measuring the temperature, velocity, composition and distribution of ultra-high temperature flowing gas jet The subtracted enthalpy probe. Background technique [0002] Thermal plasma, which is widely used in aerospace, mechanical processing, metallurgy, chemical industry and bioengineering fields, generally has a gas temperature of 3000-20000K, and the thermocouple used for conventional temperature measurement cannot be used in this case. Under such ultra-high temperature conditions, according to the gas pressure, temperature, and gas species, the degree of ionization and the number density of particles in various excited states also change accordingly. Therefore, the temperature measurement of this plasma jet , the method of spectral diagnosis is often used to measure t...

AI Technical Summary

Problems solved by technology

This kind of enthalpy probe is made into an integral structure from the probe to the shaft and the probe support. The probe head is circular, with a small diameter hole in the center, which leads to the exhaust system at the rear end, and the periphery of the vent hole is water-cooled; In order to be able to measure very high gas temperature, the enthalpy probe needs a good cooling effect, the cooling water must flow near the end, and the dead zone of water flow cannot be formed at the end, otherwise the probe will be burned; To reduce the disturbance to the measured air flow, the size of the probe and the probe rod should be reduced as much as possible, so the internal water channel of the probe is very small, and a high-pressure water pump is required to increase the pressure at the water inlet to more than 50 kg / cm2 to This increases the water flow rate to ensure the cooling effect; because the probe rod diameter that can be manufactured by general processing technology is difficult to be less than 5mm, and at the same time, the probe is inserted into the required measurement position during measurement, so it is inevitable that the high temperature measured gas will be affected. The flow of its own produces disturbance; reducing the size of the probe is the most effective way to reduce the disturbance, however, the special processing technology will make the price of the probe soar, so that the general demanders cannot bear it; in addition, the current enthalpy probes are all For the overall structure, the maximum temperature of the plasma jet often exceeds 10,000 degrees, especially when a gas with high thermal conductivity such as hydrogen is added to the jet gas, and the measurable range of the probe is roughly thousands of degrees, higher Special care must be taken when trying temperature ranges, otherwise the probe head may be burned and the probe may be scrapped as a whole

This makes it more difficult for the general user to accept, and also limits the actual use range of the probe.

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