A method and experimental device suitable for measuring the thermal conductivity of flowing high-temperature and high-pressure fluids

Abstract

The invention discloses a method and an experimental device suitable for measuring the heat conductivity coefficient of flowing high-temperature high-pressure fluid. The experimental device comprises a test tube, a heating copper electrode A, a heating copper electrode B, a temperature measuring mixed cavity A, a temperature measuring mixed cavity B, a wall temperature thermocouple, a fluid temperature thermocouple A, a fluid temperature thermocouple B, a copper electrode lead A, a copper electrode lead B, a switchover tee joint A and a switchover tee joint B, and also comprises a heat shielding screen and a thermal insulation material wrapping the outer wall of the test tube. According to the experimental device, the test tube can be well subjected to heat insulation, so that loss of natural convection heat exchange and radiant heat can be effectively reduced in experiment, the experiment date error is small, and effective basis is provided for accurate experiment data of the heat conductivity coefficient and design and application of the heat conductivity coefficient. The experimental device provides effective help for research of a novel cooling manner, and also provides experimental feasibility for accurate experimental measurement of the heat conductivity coefficient of the high-temperature high-pressure fluid under pressure of 0-7MPa.

Description

technical field [0001] The invention relates to a method and device suitable for measuring the thermal conductivity of high-temperature and high-pressure fluids, in particular to measuring the thermal conductivity of a fluid under a pressure of 0-7 MPa in a flowing state based on the conditions of laminar flow, constant heat flow boundary, flow and thermal boundary layer being fully developed at the same time Thermal Conductivity. It is mainly used in aerospace, energy, automobile, petrochemical and other related fields that lack fluid physical property data, as well as general fluid basic thermophysical property measurement. Background technique [0002] With the increase of the temperature before the turbine of the aero-engine and the boost ratio of the compressor, the temperature of the cooling air drawn from the rear stage of the compressor also increases gradually, which will lead to a decrease in the cooling quality of the cooling gas, which will bring extreme damage t...

AI Technical Summary

Problems solved by technology

And due to the differences in the composition of various oil products, there is a lack of experimental data on the thermal conductivity of aviation kerosene RP-3 at home and abroad, which is not conducive to the research and application of this new cooling method

Some research institutions at home and abroad use static and transient experimental methods and related equipment (transient hot wire method, etc.) to measure the thermal conductivity of fluids. Time will irreversibly affect the composition of kerosene, affecting the measurement results of the "downstream of time" test points

In addition, the experimental equipment of the static method is often very complicated, and the transient experiment often involves the stabilization of the constant temperature bath, and this process takes a long time to achieve equilibrium and stability, which greatly limits the use of this type of method. The use of measuring the thermal conductivity of fluids under high temperature and high pressure conditions

Complex designs such as constant temperature oil bath and electronic control system increase the difficulty of testing and development costs

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