Method and device for measuring wall heat flux density based on linear bottom layer assumption

Abstract

This disclosure provides a method for measuring wall heat flux density based on the assumption of a linear bottom layer. The method uses two parallel boundary layer hot wire probes, a stepping motor displacement mechanism, a small CTA module, a small digital-to-analog conversion module, a slip ring lead and The computer measures the boundary layer velocity and temperature under rotating conditions, and finally calculates the wall heat flux density through the verification of the linear bottom layer assumption and the turbulent standard temperature wall rate, and has the accuracy and ease of use of the measurement. The present disclosure also provides a wall surface heat flux measurement device based on the assumption of a linear bottom layer.

Description

technical field [0001] The disclosure relates to the technical field of velocity and temperature measurement in a boundary layer near a wall of a turbomachinery rotating channel, in particular to a method and device for measuring wall heat flux density based on a linear bottom layer assumption. Background technique [0002] In the heat transfer research of rotating machinery, the wall heat flux density or the wall heat flow per unit area is a very important parameter. Under conventional static conditions, due to the large installation space, the wall heat flow measurement structure can be designed very complicated, so many methods are used. This method is used to realize the measurement. The common idea is to use the voltage and resistance of the heating device to calculate the heat production per unit time, and then use the temperature sensor to measure the heat dissipation per unit time when the wall faces outside the channel, and subtract it to obtain the heat flow in the ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the measurement of the heat flux density on the wall surface of the turbomachinery rotating channel is complicated, not easy to implement, and not accurate enough, an embodiment of the present disclosure provides a method and device for measuring the wall surface heat flux density based on the assumption of a linear bottom layer. Parallel boundary layer hot wire probe, stepper motor displacement mechanism, small CTA module, small digital-to-analog conversion module, slip ring lead and computer to measure the boundary layer velocity and temperature under rotating conditions, and finally pass the linear bottom layer assumption and turbulence standard Verification of temperature wall ratio, calculation of wall heat flux, with measurement accuracy and ease of use

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