Liquid rocket engine short type thermocouple steady state calibration device

Abstract

The invention relates to a liquid rocket engine short type thermocouple steady state calibration device including a pipeline unit and a test unit, the pipeline unit includes a test section, the test section includes an inner cylinder, an outer cylinder, and an insulating material between the inner cylinder and the outer cylinder, the test unit includes a host computer, a temperature control system, a collection device, a total temperature sensor and a total pressure sensor arranged in the stable section, and a reference temperature sensor arranged in the test section, the temperature control system includes at least two sets of wall temperature sensor units, a temperature controller and at least one group of heating bodies, the heating bodies are arranged on the outer wall of the inner cylinder, the collection device feeds back the temperature information of the wall temperature sensor units to the temperature controller, the temperature controller adjusts the power of the different heating bodies to control the temperature of the inner cylinder of the test section according to the feedback information, and the temperature controller and the collection device are communicated with the host computer. The device provided can obtain the thermal conductivity correction factors for a series of short type thermocouple temperature sensors by changing the experimental conditions, thereby improving the measurement accuracy.

Description

technical field [0001] The invention relates to a steady-state calibration device for a short thermocouple of a liquid rocket engine. Background technique [0002] In the liquid rocket engine thermal test run, the temperature parameters are usually tested under the conditions of high temperature, high pressure and high speed flow. Considering the strength of the sensor and the limitation of the installation space, the temperature sensor cannot be selected completely according to the ideal design structure and size. Due to reasons such as heat transfer, sensor structure and installation method, the steady-state characteristics of the temperature sensor vary greatly. Radiation errors, heat conduction errors, and velocity errors directly affect the measurement accuracy of temperature parameters. What is actually measured is not the true temperature of the airflow, and the difference can be tens of degrees at most. Because in high temperature measurement, the radiation error ac...

AI Technical Summary

Problems solved by technology

Considering the strength of the sensor and the limitation of the installation space, the temperature sensor cannot be selected completely according to the ideal design structure and size. Due to reasons such as heat transfer, sensor structure and installation method, the steady-state characteristics of the temperature sensor vary greatly. Radiation errors, heat conduction errors, and velocity errors directly affect the measurement accuracy of temperature parameters. What is actually measured is not the true temperature of the airflow, and the difference can be dozens of degrees at most.

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