CFD Verification through comparison with LDP measurements of underexpanded gas leak. |
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| Bruno Góbi Santolin, Márcio Ferreira Martins, Ramon Silva Martins, Fernando Augusto Ramos |
- Abstract:
- A numerical model was performed to represent the expansion phenomenon resulting from the leakage of pressurized gases in a pipe using the Ansys Fluent 2021 R1 software. The free underexpanded jet was produced by a nozzle with an outlet diameter of operating at a stagnation pressure and temperature respectively equal to and , being compared with the experiment conducted by Eggins and Jackson (1974) for qualitative (visual analysis) and quantitative validation requirements (through the statistical model proposed by Hanna (1993)). After the validation of the proposed numerical model, some important results can be highlighted, such as the temperature, pressure and velocity profiles, showing important regions, such as the barrel-shaped shock and the transition limit region from Mach to Mach denominated“Mach disk”, other important results obtained such as a peak velocity of approximately , the Mach disk position obtained at , a position necessary for the correct plotting of the upstream and downstream velocity profile graphs of the Mach disk. In general, the numerical model managed to meet expectations very well, agreeing with the experiment, it had excellent results for the expected velocity profiles, obtaining maximum average error for each of the compared cases of , and for the worst case, thus validating the proposed numerical model clearly showing the main characteristics of an underexpanded free jet so necessary for leak analysis of pressurized gases.
- Keywords:
- A numerical model; Leakage of pressurized gases; Peak velocity of approximately
- Download:
- IMEKO-TC9-2019-152.pdf
- DOI:
- 10.21014/tc9-2022.152
- Event details
- IMEKO TC:
- TC9
- Event name:
- FLOMEKO 2022
- Title:
19th International Flow Measurement Conference 2022
- Place:
- Chongqing, CHINA
- Time:
- 01 November 2022 - 04 November 2022