Experimental study on thermal oxidation coking characteristics of aviation kerosene in additively manufactured helical tubes

For the purpose of obtaining the influence of ambient temperature， inlet Reyn‑ olds number and abrasive flow treatment on the coking characteristics of RP‑3 aviation kerosene，the RP‑3 aviation kerosene thermal oxidation coking tests were carried out in additively manufac‑ tured（3D printed）helical tubes through the testing way of constant ambient temperature. The test results showed that when inlet Reynolds number and test time remained constant，the deposi‑ tion rate and the total coking amount of the fuel increased with the increase of ambient tempera‑ ture，regardless of whether the fuel was in a static or flowing state；when the fuel was in a flow‑ ing state， as inlet Reynolds number increased， the deposition rate increased first and then de‑ creased with constant wall temperature and test time. After abrasive flow treatment，the deposi‑ tion rate of the fuel in the test tube was greater than that of the fuel under baseline working condi‑ tion，and the total coking amount of the fuel was 1. 17 times the total coking amount of the fuel under baseline working condition. The abrasive flow treatment on the inner surface of the test tube was not conducive to the inhibition of coking deposition. © 2022 BUAA Press. All rights reserved.