Lub sij hawm Beijing Lub Yim Hli 12 3:31 PM, Historic Park Sun detector (Parker Solar Probe) ntawm Cape Canaveral Air Force Base slc-37b launch me ntsis los ntawm Delta 4 heavy rockets launched. Tom qab lub davhlau 43 feeb, txawm hais tias lub sijhawm tau ntsib qhov thib peb ntawm qhov xav tias poob ntawm lub sijhawm zoo siab, hmoov zoo yog qhov kawg nyob ze ntawm qhov tsis nco qab, Parker ntes tau zoo cais tawm ntawm lub foob pob hluav taws, taug kev ntawm txoj kev ntev mus rau lub hnub, thiab yog li qhib txoj kev tshiab ntawm tib neeg kev tshawb nrhiav lub hnub!
Sun Detector
Launch site
Txhawm rau tsim cov ntaub ntawv hauv ntiaj teb kom ncav cuag qhov chaw nyob ze tshaj plaws hauv lub hnub, tib neeg yuav tsum nrhiav cov ntaub ntawv uas tuaj yeem tiv taus qhov kub tsis tau dhau los ntawm ultra-siab. Nws tuaj yeem hais tau tias yog tsis muaj kev tiv thaiv thermal (TPS), tsis muaj Parker. Raws li txoj kev npaj, Parker yuav nkag mus rau 4 lab mais ntawm lub hnub saum npoo av (6.11 lab km). Txhawm rau hloov mus rau qhov chaw kub kub no, tus ntes yuav nqa cov ntaub thaiv npog sib xyaw ua ke, lub dome yuav tiv taus qhov ci ntawm lub hnub. Lub tshav kub tiv thaiv tsis tuaj yeem ua tau 10 xyoo dhau los.
Yog hais tias koj yog 1 square meter satellite nyob rau hauv lub ntiaj teb orbit, thiab lub hnub lub zog yog hais txog 1350 watts mus cuag koj, tab sis Parker yog kwv yees li 25 lub sij hawm nyob ze tshaj qhov chaw no, uas yog hais txog 850,000 watts ntawm tshav kub ib square meter. Yog tias thaj chaw raug suav, Parker lub hnub ci sojntsuam yuav tsum tiv taus txog 3 lab watts ntawm lub zog. Lub ntsuas cua sov tiv thaiv kuj tseem hu ua Thermal Protection system (TPS), uas muaj ob txheej txheej txheej txheej txheej txheej txheej txheej thiab cov pa roj carbon ua npuas nrog qhov nruab nrab clamp ntawm li 4.5 ntiv tes (11.43cm). Lub tshav kub tiv thaiv lub hnub tseem muaj cov txheej tshwj xeeb dawb los cuam tshuam lub zog ntawm lub hnub kom ntau li ntau tau. Cov khoom no tiv taus 2,500 degrees Fahrenheit (kwv yees li 1371 ℃) thiab xyuas kom meej tias cov cuab yeej ua haujlwm ntawm li 85 degrees Fahrenheit (kwv yees li 30 ℃).
"Yog tias txoj haujlwm no nyob hauv 60's mus rau 70's, txawm tias thaum siv nyob rau hauv 80's, nws muaj peev xwm ya tau cov hlau kub-resistant, "Driesman hais. "Cov kws tshawb fawb yuav tsim cov hlau Jerdon nrog lub siab melting point, tab sis tsis txhob xa mus rau saum ntuj ceeb tsheej, vim cov hlau hnyav dhau." Tsis zoo li feem ntau cov roj carbon fibers, lawv cov carbon-carbon qauv tsis polymerized los ntawm hardening resins vim hardened resins evaporate ze lub hnub zoo li cov roj ntawm txoj kev kub kub, NASA sau cov resin resin nrog ", chopp. 3,000-degree qhov cub, thiab rov ua cov txheej txheem 4 mus rau 5 zaug "Thaum kawg koj yuav tau txais cov pa roj carbon fiber uas qhwv ib ncig ntawm koj. Cov qauv carbon-carbon peb tab tom tham txog yog cov pa roj carbon ntshiab, tsis muaj resins thiab lwm yam khoom. "Lub hauv ntej thiab sab nraub qaum ntawm cov ntaub thaiv npog thermal yog ua los ntawm cov pa roj carbon-carbon phaj, uas, ntxiv rau kev rwb thaiv tsev, muaj lub zog zoo heev. 2 txheej ntawm cov ntawv carbon-carbon yog nyias txaus los khoov thiab txawm sib tshooj. Nyob rau hauv nruab nrab ntawm ob-txheej txheej carbon-carbon cov ntaub ntawv, ib txheej ntawm txog 4.5 nti ntawm carbon npuas, uas yog tam sim no feem ntau siv nyob rau hauv kev kho mob kev lag luam los tsim lwm cov pob txha. Lub sandwich tsim props txog tag nrho cov qauv zoo li corrugated cardboard-uas hnyav xwb 160 phaus (kwv yees 73kg) rau tag nrho 8-taw-thick heat shield.
Ua npuas ncauj kuj yog cov qauv tseem ceeb tshaj plaws ntawm thermal shield rwb thaiv tsev muaj nuj nqi. Tab sis 97% ntawm cov pa roj carbon npuas yog huab cua, txhawm rau txo qhov hnyav ntawm qhov chaw sojntsuam ntxiv. Cov pa roj carbon nws tus kheej yog thermally conductive, thiab cov qauv ua npuas ncauj kuj txhais tau tias tsis muaj cua sov ntau dhau los. Cov npuas tsis yooj yim rau kev sim, lawv yog cov nkig heev. Tab sis muaj lwm qhov teeb meem. "Thaum lawv kub, lawv hlawv." "hais tias Abel. Kev kub hnyiab tsis yog qhov teeb meem loj hauv lub tshuab nqus tsev, tab sis cov huab cua seem hauv qhov kev sim yuav ua rau cov npuas ua rau charcoal. Yog li ntawd, National Oak Ridge Laboratory Engineers nrog kub-kub plasma arc teeb los ntsuas cov cua kub ntawm cov pa roj carbon monoxide siab kub ua haujlwm. dissipation nyob rau hauv qhov chaw, tib txoj kev uas yuav dissipate tshav kub yog kom tawg lub teeb thiab emit tshav kub nyob rau hauv daim ntawv ntawm photons, yog li ntawd, yuav tsum tau muaj lwm yam kev tiv thaiv txheej: ib tug dawb tiv thaiv txheej yog siv los cuam tshuam tshav kub thiab lub teeb.
Parker Solar Detector thermal shield qauv schematic daim duab
Txog rau qhov kawg no, Applied Physics Laboratory ntawm Johns Hopkins University thiab Advanced Technology Laboratory ntawm Whiting School of Engineering (Advanced Technology Laboratory hauv Johns Hopkins University 's whiting School Engineering) tau tsim ib pab pawg kws tshaj lij ntawm thermal insulating txheej super nplua nuj pab pawg, nrog pab pawg tshawb fawb txog kev kub ntxhov, tshuaj tsuag tshuaj thiab plasma. Los ntawm kev soj ntsuam ntxiv, pab neeg kawg tau xaiv cov txheej txheem dawb ntawm kev tiv thaiv raws li alumina. Tab sis cov txheej txheem tiv thaiv yuav greyed tawm hauv qhov kub thiab txias ib puag ncig nrog cov pa roj carbon monoxide, yog li cov engineers ntxiv txheej tungsten rau hauv nruab nrab, thinner dua cov plaub hau, thiab coated nyob rau hauv nruab nrab ntawm lub tshav kub daim ntaub thaiv npog thiab cov ntaub thaiv npog dawb los tiv thaiv kev sib cuam tshuam ntawm ob txheej. Lawv kuj ntxiv ib tus neeg sawv cev nano-doping los ua kom cov ntaub thaiv npog dawb thiab tiv thaiv cov thermal expansion ntawm alumina hais. Dennis Nagle, tus kws tshaj lij kev tshawb fawb ntawm Center for Systems Science thiab engineering, tau hais tias feem ntau yog thaum siv cov ceramics, cov txheej txheem nruj, ntxeem tau zoo dua, tab sis cov khoom tawg thaum ntaus nrog rauj. Thaum qhov kub ntawm Parker ntsej muag, cov txheej du tawg zoo li lub qhov rais pob zeb. Yog li ntawd, txawm tias cov coatings ntxeem tau tuaj yeem tiv taus qhov chaw huab cua. Thaum cov kab nrib pleb tshwm sim hauv cov txheej ntxeem tau, cov kab nrib pleb nres thaum lawv mus txog qhov pores. Cov txheej txheej muaj ob peb coarse granular khaubncaws sab nraud povtseg - txaus tso cai rau ib pab pawg neeg ntawm tej hub hais kom muaj kev cuam tshuam lub teeb uas ploj lawm los ntawm lwm txheej.
Post lub sij hawm: Aug-15-2018