Abstract
Making quantitative measurements of the vapor distribution in a cavitating nozzle is difficult, owing to the strong scattering of visible light at gas-liquid boundaries and wall boundaries, and the small length and time scales involved.
The transparent models required for optical experiments are also often limited to lower pressures, larger scale and shorter operating life than the metal nozzles used in fuel injection systems. It is also difficult to obtain a surface finish in a plastic nozzle that can reproduce the surface finish of metal nozzles. Over the past few years, x-ray radiography experiments at Argonne National Laboratory have demonstrated the ability to measure vapor fraction in cavitating plastic nozzles. In this paper, we present the results of new time-resolved radiography experiments performed in a beryllium nozzle with diameter D=0.50mm and length L=3.05mm. Beryllium is a light, brittle metal which is transparent to x-rays. Unlike plastics, it more closely replicates the machined surface finish found in steel fuel injector nozzles, and can withstand higher internal stresses. The spatial and temporal resolution of the data were 5 μm and 153 ns. The time-resolved nature of the measurement allows us to measure the fluctuations and
spectral properties of the vapor distribution.
The transparent models required for optical experiments are also often limited to lower pressures, larger scale and shorter operating life than the metal nozzles used in fuel injection systems. It is also difficult to obtain a surface finish in a plastic nozzle that can reproduce the surface finish of metal nozzles. Over the past few years, x-ray radiography experiments at Argonne National Laboratory have demonstrated the ability to measure vapor fraction in cavitating plastic nozzles. In this paper, we present the results of new time-resolved radiography experiments performed in a beryllium nozzle with diameter D=0.50mm and length L=3.05mm. Beryllium is a light, brittle metal which is transparent to x-rays. Unlike plastics, it more closely replicates the machined surface finish found in steel fuel injector nozzles, and can withstand higher internal stresses. The spatial and temporal resolution of the data were 5 μm and 153 ns. The time-resolved nature of the measurement allows us to measure the fluctuations and
spectral properties of the vapor distribution.
| Original language | English |
|---|---|
| Title of host publication | ILASS – Europe 2016, 27th Annual Conference on Liquid Atomization and Spray Systems |
| Subtitle of host publication | 4-7 September 2016, Brighton, UK |
| Editors | Sergei Sazhin |
| Publisher | Institute for Liquid Atomization and Spray Systems |
| Pages | 1-10 |
| Number of pages | 10 |
| ISBN (Print) | 9781910172100 |
| Publication status | Published - 2016 |
| Externally published | Yes |
| Event | International Conference on Liquid Atomization and Spray Systems - University of Brighton, Brighton, United Kingdom Duration: 4 Sep 2016 → 7 Sep 2016 |
Conference
| Conference | International Conference on Liquid Atomization and Spray Systems |
|---|---|
| Abbreviated title | ILASS 2016 |
| Country | United Kingdom |
| City | Brighton |
| Period | 4/09/16 → 7/09/16 |