Cov dej ntws ntawm cov kua ntshiab tuaj yeem ib txwm suav tias yog qhov tsis txaus ntseeg yog tias tus lej Mach yog < 0.3 , thiab qhov sib txawv ntawm qhov kub thiab txias ΔT hauv cov kua yog me me piv rau qhov ntsuas kub T 0 (Panton, 2013).
Ntawm tus lej Mach npaum li cas yog ntws compressible?
Compressible flows have a Mach number greater than 0.8. Lub siab muaj zog cuam tshuam rau qhov ceev, thiab kev poob siab tuaj yeem ua tau. Compressible flows tuaj yeem yog transonic (0.8 < M < 1.2) lossis supersonic (1.2 < M < 3.0). Nyob rau hauv supersonic ntws, cov teebmeem siab tsuas yog thauj mus rau hauv qab.
Qhov twg yog qhov tsis txaus ntseeg?
Nyob rau hauv dej dynamics, ib tug ntws yog xam incompressible yog tias qhov sib txawv ntawm qhov khiav ceev yog xoom. Txawm li cas los xij, qee zaum cov qauv tsim muaj feem xyuam tuaj yeem siv tau, nyob ntawm qhov kev khiav dej num ua qauv.
Dab tsi yog qhov tseem ceeb ntawm Mach tus lej hauv compressible kua ntws?
Rau supersonic thiab hypersonic ntws, qhov ceev hloov sai dua li qhov kev hloov pauv los ntawm qhov xwm txheej equl rau square ntawm Mach tus lej. Cov teebmeem Compressibility tseem ceeb dua nrog cov lej Mach siab dua.
Yuav ua li cas koj xam incompressible flow?
- Hint: Yog tias cov kua dej tsis sib haum, txhua yam nkag mus hauv yuav tsum tawm. …
- Yog qhov sib txawv ntawm qhov nrawm yog xoom ntawm qhov muab, ces nws tsis tuaj yeem ua rau qhov ntawdtaw tes. …
- thanks Christian and choward @ choward kuv xav li koj hais mas prove tsis tau ib qho chaw ntawm no rigion is not incompressible txawm 4 ces kaum yog incompressible.
