Ramjet vs Scramjet
Supersonic thiab Hypersonic davhlau yog kev npau suav ntawm aeronautical engineers, qhov twg ya ntau zaus ntawm lub suab nrawm yog qhov kev ua haujlwm nyuaj. Txawm hais tias supersonic yog kev npau suav pom tus nqi ua rau nws nyuaj rau kev siv nyiaj txiag.
Ramjet thiab Scramjets yog cov cav siv nws tus kheej kom nrawm nrawm rau huab cua thiab txhawb nqa lub cav. Lub ramjet cav tshuab siv tau rau ntau qhov xwm txheej xws li missiles, supersonic aircraft mus rau artillery rounds, thaum lub tshuab scramjet tseem muaj kev sim siab heev.
Ntau txog Ramjet
Lub ramjet, qee zaum hu ua lub dav hlau stovepipe lossis athodyd, yog lub tshuab ua pa dav hlau, uas siv lub cav txav mus rau pem hauv ntej kom compress cua tuaj, tsis muaj lub tshuab hluav taws xob teb tam sim no hauv cov tshuab dav hlau.
Los ntawm kev tsim, ramjets tsis tuaj yeem tsim qhov nrawm ntawm xoom tshaj tawm, pib thaum lawv tseem. Yog li ntawd, cov dav hlau xav tau ib lub tshuab propulsion los pib lub zog rau compression hauv ramjet los ua. Rau kev ua haujlwm zoo tshaj plaws ramjets xav tau nrawm nyob ib puag ncig Mach 3 thiab tuaj yeem ua haujlwm mus txog qhov nrawm ntawm Mach 6. Kev ua haujlwm ntawm Ramjet yog raws li lub voj voog Brayton.
Cov cua nkag tau yog compressed siv cov nozzles tsim nyob rau hauv cov cheeb tsam compression, thiab cov khiav ceev yog txo mus rau subsonic speeds kom zoo combustion. Cov nplaim hluav taws kub hnyiab tau qhov sib tov los ua kom muaj kev kub ntxhov siab tshaj tawm cov roj ntws tawm ntawm lub cav ntawm supersonic speeds.
Ramjets tuaj yeem siv rau cov ntawv thov uas xav tau lub cav me me thiab yooj yim rau kev siv ceev, xws li Lavxias Indian ste alth BrahMos missiles, thiab Indian Akash missile siv ramjet thev naus laus zis. Lawv kuj tau siv tau zoo, txawm tias tsis muaj txiaj ntsig, zoo li cov dav hlau dav hlau ntawm lub dav hlau rotors. Lub dav hlau xyaw ntawm legendary Lockheed SR 71 ua raws li ramjets raws li lub dav hlau ceev tshaj qhov ceev ntawm lub suab.
Qhov zoo ntawm ramjets yog ywj siab ntawm cov pa oxygen thiab tsis suav nrog qhov sib hloov uas ua rau nws yooj yim rau kev tsim thiab tswj.
Ntau txog Scramjet
A scramjet (Supersonic Combustion RAMjet) yog qhov sib txawv ntawm ramjet nyob rau hauv uas combustion tshwm sim thaum airflow yog supersonic. Raws li nyob rau hauv ramjets, scramjets kuj compress cov cua tuaj ua ntej combustion siv lub ceev ntawm lub tsheb. Txawm li cas los xij, ramjets decelerate lub airflow mus rau subsonic speeds nyob rau hauv lub cav ua ntej combustion, tab sis airflow nyob rau hauv ib tug scramjet yog supersonic thoob plaws hauv lub engine. Supersonic flow tsim ntau cov tshuaj tiv thaiv muab lub peev xwm rau scramjets ua haujlwm zoo ntawm Hypersonic speeds; theoretical sab saum toj ceev ntawm scramjet nyob nruab nrab ntawm Mach 12 (15, 000 km / h) thiab Mach 24 (29, 000 km / h), thiab lub dav hlau ua pa ceev tshaj plaws muaj Scramjet xyaw; NASA X-43A mus txog Lub Peb Hlis 9.6.
Zoo li ramjet, scramjets tsis muaj qhov txav hauv lub cav thiab tau txais tag nrho cov kev xav tau tseem ceeb xws li cov txheej txheem propulsion kom ceev lawv mus rau qhov nrawm nrawm. Thaum scramjets yog cov tswv yim yooj yim hauv kev tsim thiab kev tsim kho, kev siv tiag tiag yog txwv los ntawm kev sib tw loj engineering. Lub aerodynamic luag ntawm Hypersonic davhlau nyob rau hauv cov huab cua yog qhov loj, thiab qhov kub thiab txias nyob rau hauv lub dav hlau thiab lub cav yog ntau dua qhov kub nyob ib puag ncig huab cua; li no yuav tsum tau cov ntaub ntawv tshiab los tiv thaiv qhov kub thiab txias. Kev tuav cov combustion nyob rau hauv lub supersonic ntws ua rau muaj teeb meem ntxiv vim hais tias, nyob rau hauv milliseconds ntawm lub sij hawm, cov roj yuav tsum tau txhaj, tov, ignited, thiab hlawv.
Ntxiv rau qhov zoo ntawm cov ramjets, scramjets muaj lub zog tshwj xeeb siab dua (hloov lub zog ntawm ib chav tsev ntawm lub tshuab hluav taws xob) dua li cov tshuab dav hlau. Ramjets tsim cov impulse tshwj xeeb ntawm 1000 thiab 4000 vib nas this, thaum lub foob pob hluav taws tsuas muab 600 vib nas this lossis tsawg dua.
Vim tias scramjets muaj qhov ua tau zoo theoretical, lawv tau pom zoo tias yog lub zog cog rau lub caij tom ntej orbital tsheb thiab NASA ua kev tshawb fawb ntau hauv scramjet technology arena.
Dab tsi yog qhov txawv ntawm Ramjet thiab Scramjet?
• Ntws hauv ramjet yog subsonic thaum, hauv Scramjet, nws yog supersonic.
• Scramjets tsim cov kev xav tau siab dua.
• Theoretically Ramjets muaj qhov nrawm ntawm 1 txog 6 Mach thaum, hauv Scramjets, qhov ntau yog 12 txog 24 Mach. Txawm li cas los xij, qhov ceev tshaj plaws tau txais kev ceev yog 9.6 mach tau los ntawm X-43A.
Daim duab Sources:
en.wikipedia.org/wiki/File:Ramjet_operation.svg
en.wikipedia.org/wiki/File:Scramjet_operation_en.svg
