Device for measuring total temperature of high temperature air flow

Abstract

The invention relates to a device for measuring the total temperature of a high temperature air flow, including a head 1, a cooling system 2, an orifice plate flowmeter 3, a switching valve 4, a gas analyzer 5, a vacuum pump 6 and a main body 7. The head 1 is mounted on the main body 7 and is connected to the orifice plate flowmeter 3 by passing through the cooling system 2, and thereafter the switching valve 4, the gas analyzer 5 and the vacuum pump 6 are sequentially mounted on the second half of the main body 7. In the work, the device can obtain the total pressure of a measured air flow by back calculation through using the mass conservation and pneumodynamics principle and measuring flow parameters of the gas total pressure, the gas composition, the front static pressure and the static temperature of the orifice plate flowmeter 3, the static pressure difference between the front and the back of the orifice plate flowmeter and the like. The device is featured by high temperature measurement upper limit and high temperature measurement precision. In the measurement of the total temperature of the measured air flow, the total pressure and the air flow components of the measured air flow can be measured respectively.

Description

technical field [0001] The invention relates to the technical field of high-temperature flow field testing, in particular to a device for measuring the total temperature of high-temperature air flow, which can prevent the device from being damaged by high-temperature incoming flow during the test of high-temperature flow field. Background technique [0002] At present, in the field of temperature measurement of high-temperature airflow, the most mature and widely used temperature measurement method is thermocouple temperature measurement technology. Due to the limitation of the melting point of the wire, the upper limit of the temperature measurement of the standard thermocouple is below 1800 °C, and the temperature measurement limit of the non-standard thermocouple is generally below 2400 °C. Since the thermocouple immersed in the airflow will perform radiation heat exchange with the surrounding environment and conduct heat conduction with the support, the higher the temper...

AI Technical Summary

Problems solved by technology

A utility model patent with the publication number CN85203670U proposes a dual-purpose high-temperature air flow thermometer, which can increase the convective heat transfer through the thermocouple and reduce the radiation error by pumping air through the exhaust fan, and at the same time can complete the sampling of the measured air flow , but these two methods are still limited by the upper limit of thermocouple temperature measurement

In the invention patent with publication number CN102141447A, the upper limit of temperature measurement is limited by the characteristics of the steel probe itself; and although the total temperature and total pressure are also measured, when measuring different parameters, the sampling in space The point positions do not coincide, and the measured parameters are not strictly the sampling results of the same point

[0004] In addition to thermocouples, temperature measurement methods such as gas analysis temperature measurement technology, CARS temperature measurement technology, optical fiber temperature measurement technology, and acoustic temperature measurement technology have also been developed rapidly in recent years. There is still a long way to go before large-scale application

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