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《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:

2018年06期

Page:

81-85

Research Field:

测控与试验

Publishing date:

Info

Title:

Numerical simulation and analysis of thermal conductivity error for short type thermocouple

Author(s):

MO Jianwei¹;  JING Zhuoyin²; LI Tong¹; WANG Yong¹; LI Longfei¹

1.Xi'an Aerospace Propulsion Institute, Xi'an 710100, China; 2.Beijing Changcheng Institude of Metrology and Measurement, Beijing 100095, China

Keywords:

short type thermocouple;  numerical simulation;  thermal conductivity error correction

PACS:

V430-34

DOI:

-

Abstract:

In the research of aerospace engine technology, accurate measurement of airflow temperature in high temperature and high speed environment is usually required to evaluate the performance of the engine.In addition, depth of the thermocouples insertion at high temperature airflow is very short due to the restriction of geometrical space and sensor strength, which causes large thermal conductivity error and affects the judgment of engine working characteristics.In this paper, research on thermal conductivity error of short type thermocouple is carried out.A simulation model of thermal conductivity error for short thermocouple is established.And the accuracy of the simulation model is verified further.Through numerical simulation, the influence of thermocouple insertion depth, Mach number of incoming flow, total temperature of incoming flow and substrate temperature on the correction coefficient of heat conduction error was studied.The response surface model of thermal conductivity error correction coefficient was established.The simulation results can provide an idea for the suppression of thermal conductivity error of short thermocouple and provide a support for the measured data correction in the application process of thermocouple.

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Memo

Memo:

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Common functions

Last Update: 2018-12-25