Timeline for Why is only part of the jet ‘compacted’ when Mach diamonds form?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 30 at 3:29 | vote | accept | Wyatt | ||
| Sep 14 at 17:48 | comment | added | Rob McDonald | Maybe I have it backwards.... Lets think through it... The shock will increase the pressure. If you have over-expanded, then you've dropped the pressure below ambient -- and it will need a shock to get back up to ambient. Oops, looks like I got it mixed up. Everything else I said was right though. | |
| Sep 14 at 16:48 | comment | added | Wyatt | Ah okay. This other answer must've gotten that mixed up. It says over-expanded flow starts with a shock, and under-expanded starts with a expansion fan. (See the 2 pictures at the bottom). | |
| Sep 14 at 16:28 | comment | added | Rob McDonald | under-expanded flow starts with a shock and necks in. over-expanded flow starts with an expansion fan and spreads out. perfectly expanded flow has no shock/fan features and stays straight. | |
| Sep 14 at 4:36 | comment | added | Wyatt | That is not something that I considered, thanks. Would this situation be much different with over-expanded flow? I incorrectly assumed the pictures were of an overexpanded case. | |
| Sep 14 at 4:29 | history | answered | Rob McDonald | CC BY-SA 4.0 |