Method for determining enthalpy value of mixed test medium in arc heating test

Abstract

The invention discloses a method for determining an enthalpy value of a mixed test medium in an arc heating test. The method comprises the following steps of (1) inputting actually measured parameters of the arc heating test, including hot air pressure P hot of a mixing chamber, cold air pressure P cold of the mixing chamber, argon mass flow and mass flow of another gas B in the mixing chamber; (2) distributing P cold to obtain cold air pressure partial pressure P cold 1 and P cold 2 of the gas B and argon; (3) obtaining the initial hot air pressure PN_0 of the gas B; (4) obtaining airflow temperature T hot N based on PN_0 and P cold 2; (5) obtaining the hot air pressure P hot 1_N of the argon according to the T hot N, obtaining the hot air pressure PN of the gas B, and further obtaining the airflow temperature T hot N+1; judging whether the T hot N+1 converges or not, and if the final temperature T of the convergent airflow is equal to the T hot N+1; otherwise, returning to the step (4); (6) according to the obtained gas flow temperature T, the enthalpy value H1 of the argon and the enthalpy value H2 of gas B being obtained; and (7) obtaining the enthalpy value H0 of the mixed test medium according to the enthalpy value H1 of the argon and the enthalpy value H2 of the gas B.

Description

technical field [0001] The invention relates to the measurement of airflow parameters in the ground test of electric arc heating equipment, which is used for the measurement of the airflow enthalpy value of the mixed test medium of the laminated electric arc heater, and belongs to the research field of the ground aerodynamic heat test of aircraft. Background technique [0002] The arc heating equipment obtains high-temperature airflow by heating the air medium with an arc, which can simulate the aerodynamic thermal environment of the aircraft reentry, and is the preferred ground test simulation environment for the screening and assessment of heat-resistant materials. At present, the main arc heating equipment includes tubular, segmented, AC, laminated and other forms, among which laminated arc heating can simulate high enthalpy and high pressure thermal environment at the same time, it is the best choice for thermal protection ground test of new hypersonic aircraft Important...

AI Technical Summary

Problems solved by technology

However, the introduction of a small amount of argon, mixed with the air medium of the main air flow, poses a new problem for the determination of the enthalpy value of the arc heater test air flow

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