Ukujonga Ngokusondeleyo i-VCH Mass Fraction kwi-HTPB-Based Propellants
Izinto ezibalulekileyo ekufuneka ziqwalaselwe
- Inxalenye yobunzima be-VCH ichaphazela kakhulu ukusebenza kwee-propellants ezisekelwe kwi-HTPB. Ukulungisa le pesenti kunokuphucula amandla, ukhuseleko kunye nokusebenza kakuhle.
- Kucetyiswa ukuba kubekho iqhezu lobunzima be-VCH eliphakathi kwe-4% kunye ne-6% ukuze kubekho ulungelelwaniso oluhle lokuguquguquka namandla. Qala ngaphakathi kolu luhlu ukuze ufumane iziphumo ezilungileyo.
- Soloko uvavanya iibhetshi ezincinci ngaphambi kokuba uvelise imveliso enkulu. Oku kunceda ekuchongeni iingxaki kwangethuba kwaye kuqinisekisa ukhuseleko kunye nokusebenza kuyahlangabezana neemfuno zakho.
Impembelelo ye-VCH Mass Fraction kwi-HTPB CAS 69102-90-5 Hydroxyl-terminated polybutadiene Formulations
Yintoni i-VCH Mass Fraction?
Usenokuzibuza ukuba ithetha ukuthini i-VCH mass fraction. I-VCH imele i-vinylcyclohexene, ikhemikhali oyongeza kwi-HTPB-based propellants. I-mass fraction ikuxelela ukuba ingakanani i-VCH ekhoyo xa ithelekiswa nobunzima obupheleleyo bomxube we-propellant. Ngokwesiqhelo ubona eli xabiso njengepesenti. Umzekelo, ukuba une-propellant ene-VCH mass fraction eyi-5%, oko kuthetha ukuba i-5% yobunzima bubonke ivela kwi-VCH.
Kufuneka uyiqwalasele le nombolo kuba itshintsha indlela i-propellant yakho eziphatha ngayo. Impembelelo ye-VCH mass fraction ekusebenzeni kwesicelo se I-HTPB CAS 69102-90-5 I-polybutadiene epheliswe yi-Hydroxyl iqala ngolu linganiselo lusisiseko. Nokuba utshintsho oluncinci kwinxalenye yobunzima be-VCH lunokwenza umahluko omkhulu kwimveliso yokugqibela.
Qaphela: Soloko ujonga i-VCH mass fraction ngaphambi kokuba udibanise okanye usebenzise ii-propellants ezisekelwe kwi-HTPB.
Indima ye-VCH kwi-HTPB-Based Propellants
Usebenzisa i-VCH ukulungisa iipropati zeepropellants ezisekelwe kwi-HTPB. I-VCH inceda ukulawula indlela ipropellant ephilisa ngayo kunye nokuba iba namandla kangakanani. Xa utshintsha i-VCH mass fraction, ungenza i-propellant ithambe okanye ibe nzima. Ungayichaphazela nendlela etsha ngayo kunye nendlela ekhuselekile ngayo ukuyiphatha.
Impembelelo ye-VCH mass fraction ekusebenzeni kwe-HTPB CAS 69102-90-5 Hydroxyl-terminated polybutadiene ibonakala ngeendlela ezininzi. Ubona utshintsho kumandla oomatshini, izinga lokutsha, kwanobomi bokugcina. Ukuba ufuna i-propellant esebenza kakuhle kwiimfuno zakho, kufuneka uqonde. indima ye-VCH kunye nokuba ingakanani na ekufuneka isetyenziswe.
- I-VCH ilawula isantya sokunyanga.
- I-VCH ichaphazela ukuguquguquka.
- I-VCH itshintsha iimpawu zokutsha.
Ungayiphucula i-propellant yakho ngokulungelelanisa i-VCH mass fraction ukuze ihambelane neenjongo zakho.
Impembelelo ye-VCH Mass Fraction kwiipropati zoomatshini
Amandla okuThatha kunye nokuNqamka
Kufuneka wazi indlela i-VCH mass fraction etshintsha ngayo amandla kunye nobude be-propellant yakho. Xa wongeza i-VCH engaphezulu, uhlala ubona i-propellant ithamba kwaye iguquguquka ngakumbi. Ukuba usebenzisa i-VCH encinci, i-propellant idla ngokuba nzima nangakumbi. Oku kwenzeka kuba i-VCH itshintsha indlela ii-HTPB chains ezidibana ngayo ngexesha lokunyanga.
-
Inxalenye ephezulu yobunzima be-VCH:
- Ukwandisa ukuqina
- Yenza kube lula ukugoba i-propellant
- Inganciphisa amandla aphezulu anokuthi aphathwe yipropellant ngaphambi kokuba iqhekeke
-
Inxalenye yobunzima be-VCH esezantsi:
- Yonyusa amandla okuxinana
- Yenza i-propellant iqine ngakumbi
- Yehlisa ukuguquguquka
Icebiso: Ukuba ufuna i-propellant eyolulayo engaqhekekiyo, zama i-higher Iqhekeza lobunzima be-VCHUkuba ufuna amandla angakumbi, sebenzisa i-VCH encinci.
Indlela Yokuziphatha Enempembelelo
Kufuneka ucinge nangendlela ipropellant yakho esabela ngayo xa itshayiswa okanye iwiswa. I-VCH mass fraction idlala indima enkulu apha. I-VCH mass fraction ephezulu inceda ipropellant ukuba ifunxe ngcono ukuthuthumela. Oku kuthetha ukuba ipropellant yakho ayinakuqhekeka okanye iphuke ukuba iyawa.
Inxalenye yobunzima be-VCH ephantsi yenza i-propellant eqinileyo kodwa ikwaphuka ngakumbi. Isenokuqhekeka okanye iqhekeke xa ibetheke ngamandla.
| Iqhekeza le-VCH Mass | Ukumelana neempembelelo | Ubukhazikhazi |
|---|---|---|
| Phezulu | Phezulu | Iphantsi |
| Iphantsi | Iphantsi | Phezulu |
Qaphela: Soloko uvavanya indlela ipropellant yakho eziphatha ngayo ngaphambi kokuba uyisebenzise kwiimeko zokwenyani. Ukhuseleko luza kuqala!
Impembelelo ye-VCH Mass Fraction kuZinzo loBushushu kunye nokuSebenza kakuhle
Uzinzo lobushushu
Udinga ukuba i-propellant yakho ihlale izinzile xa ibekwe kubushushu. Inxalenye yobunzima be-VCH itshintsha indlela osebenza ngayo I-propellant esekelwe kwi-HTPB iphatha amaqondo obushushu aphezulu. Xa ulungisa umxholo we-VCH, utshintsha amaqondo obushushu apho izinto ziqala ukubola khona. Inxalenye ephezulu yobunzima be-VCH inokunciphisa amaqondo obushushu okuqala kokubola, oko kuthetha ukuba i-propellant yakho inokuqala ukulahlekelwa bubunzima okanye ukuqhekeka kumaqondo obushushu aphantsi.
Nantsi itheyibhile ebonisa indlela iipropellants ezisekelwe kwi-HTPB ezahlukeneyo eziziphatha ngayo xa kushushu:
| Izinto eziphathekayo | Ubushushu bokubola kokuqala (°C) | Ukulahleka kobunzima (%) | Ubushushu obuphezulu (°C) |
|---|---|---|---|
| I-TNEF | 169.0 | 98.79 | 186.6 |
| I-HTTPB (yokuqala) | 301.2 | 14.81 | 322.5 |
| I-TNEF/HTTPB | 139.8 | 99.13 | 163.7 |
| I-AP/HTTPB (yokuqala) | 168.0 | 11.82 | 189.9 |
Icebiso: Ukuba ufuna i-propellant yakho imelane nobushushu ngcono, khetha i-VCH mass fraction egcina ubushushu bokubola kokuqala buphezulu.
Ukuqhubekeka
Ufuna ukuba i-propellant yakho ibe lula ukuyixuba, ukuyigalela, kunye nokuyinyanga. Inxalenye yobunzima be-VCH ichaphazela indlela umxube wakho ogudileyo nosebenza ngayo. Umxholo ophezulu we-VCH unokwenza i-propellant ithambe kwaye kube lula ukuyibumba. Oku kukunceda ugcwalise ii-molds okanye izikhongozeli ngaphandle kwengxaki. Ukuba usebenzisa i-VCH encinci, umxube unokuba mkhulu kwaye kube nzima ukuwuphatha.
- Inxalenye ephezulu yobunzima be-VCH: Kulula ukuxuba nokuthulula, ukuhamba kwamanzi kungcono.
- Inxalenye yobunzima be-VCH esezantsi: Ityebile, kunzima ukuyicubungula, kodwa inokunika imveliso yokugqibela enamandla ngakumbi.
Qaphela: Soloko ulinganisela ukuqhubekeka kwe-processing kunye neempawu zokugqibela ozifunayo. I-VCH eninzi ingenza kube lula ukuyiphatha kodwa inokunciphisa uzinzo lobushushu.
Impembelelo ye-VCH Mass Fraction kwiMetrics yokusebenza kwesicelo
Ukusebenza kakuhle kokutsha kunye nezinga lokutsha
Ufuna i-propellant yakho itshise kakuhle nangendlela efanelekileyo. Ubungakanani be-VCH obongezayo kuyo Iipropellants ezisekelwe kwi-HTPB Itshintsha indlela ipetroli yakho etsha ngayo. Xa unyusa iqhezu lobunzima be-VCH, uhlala ubona izinga lokutsha elikhawulezayo. Oku kwenzeka kuba i-VCH itshintsha indlela i-propellant esabela ngayo kubushushu kunye ne-oksijini.
Ukuba usebenzisa i-VCH eninzi kakhulu, i-propellant ingatsha ngokukhawuleza kakhulu. Oku kunokubangela iingxaki ngoxinzelelo kunye nokuzinza. Ukuba usebenzisa kancinci kakhulu, izinga lokutsha liyehla. Irokhethi okanye isixhobo sakho sisenokungafumani ukutyhala okwaneleyo.
Icebiso: Soloko uvavanya amanqanaba ahlukeneyo e-VCH ukuze ufumane izinga lokutsha elingcono kwisicelo sakho.
Nantsi itheyibhile elula ebonisa indlela i-VCH mass fraction enokuchaphazela ngayo izinga lokutsha:
| Iqhekeza le-VCH Mass | Izinga Lokutsha (mm/s) | Ukusebenza kakuhle kokutsha (%) |
|---|---|---|
| Iphantsi | 4.2 | 85 |
| Phakathi | 6.0 | 92 |
| Phezulu | 7.8 | 95 |
Ungabona ukuba iqhekeza eliphakathi le-VCH mass lihlala likunika ibhalansi engcono kakhulu. Ufumana izinga elihle lokutsha kunye nokusebenza kakuhle kokutsha. Impembelelo yeqhekeza eliphakathi le-VCH mass ekusebenzeni kwe-HTPB CAS 69102-90-5 I-polybutadiene epheliswe yi-hydroxyl iyacaca xa uthelekisa la manani.
Ukuba ufuna ukuphucula ukusebenza kakuhle kokutsha, kufuneka ulungise umxholo we-VCH ngononophelo. Ukuba ininzi kakhulu okanye incinci kakhulu inokunciphisa ukusebenza. Soloko ujonga iziphumo zakho kwaye wenze utshintsho oluncinci ukuze ufumane iziphumo ezilungileyo.
Imveliso yamandla
Ukwakhathalele nokuba ingakanani amandla akhutshwa yipropellant yakho. Ukuphuma kwamandla kukuxelela ukuba ipropellant yakho inamandla kangakanani. Inxalenye yobunzima be-VCH idlala indima enkulu apha. Xa utshintsha umxholo we-VCH, utshintsha ulwakhiwo lweekhemikhali zepropellant. Oku kuchaphazela ukuba ingakanani amandla akhutshwayo ngexesha lokutsha.
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Inxalenye ephezulu yobunzima be-VCH:
- Inokunyusa amandla apheleleyo akhutshwayo
- Ingabangela ukukhululwa kwamandla ngokukhawuleza, nto leyo enokuba nzima ukuyilawula
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Inxalenye yobunzima be-VCH esezantsi:
- Ingenza imveliso yamandla ibe nozinzo ngakumbi
- Inganciphisa amandla apheleleyo akhoyo
Kufuneka ulinganise amandla aphumayo neemfuno zakho. Kwiirokethi, ungafuna amandla aphumayo aphezulu. Kwizicelo ezikhuselekileyo nezitsha kancinci, ungafuna amandla amancinci.
Qaphela: Soloko ulinganisela amandla aphumayo kunye nokhuseleko. Amandla aphezulu anokuba yingozi ukuba awalawulwa.
Impembelelo ye-VCH mass fraction ekusebenzeni kwesicelo se I-HTPB CAS 69102-90-5 I-polybutadiene epheliswe yi-Hydroxyl ibonakala kwisantya sokutsha kunye nemveliso yamandla. Ungayilungisa ipropellant yakho ukuze ijonge isantya, amandla, okanye ukhuseleko ngokulungisa umxholo we-VCH.
Ukuba ufuna iziphumo ezilungileyo, vavanya amanqanaba ahlukeneyo e-VCH kwaye ulinganise amandla aphumayo. Sebenzisa idatha yakho ukukhetha ifomula efanelekileyo yeprojekthi yakho.
Impembelelo ye-VCH Mass Fraction kwiZinto eziqwalaselwayo zokuThembeka kokusebenza, iNdalo, kunye noKhuseleko
Ukuthembeka kokusebenza
Ufuna ukuba i-propellant yakho isebenze ngalo lonke ixesha xa uyisebenzisa. I-VCH mass fraction ichaphazela indlela i-propellant yakho esekelwe kwi-HTPB ethembekileyo ngayo kwiimeko zokwenyani. Xa ulungisa umxholo we-VCH, utshintsha indlela i-propellant ephendula ngayo kuxinzelelo, ubushushu, kunye noxinzelelo. I-VCH mass fraction elinganiselayo inceda i-propellant yakho ukuba ihlale izinzile ngexesha lokugcina nokusetyenziswa. Ukuba usebenzisa i-VCH eninzi kakhulu okanye encinci kakhulu, unokubona imifantu, ukutsha okungalinganiyo, okanye nokungaphumeleli ngexesha lokusebenza. Kufuneka usoloko uvavanya i-propellant yakho phantsi kweemeko ezahlukeneyo ukuqinisekisa ukuba isebenza njengoko kulindelekile.
Impembelelo kwiNdalo
Kwakhona kufuneka ucinge ngendalo esingqongileyo. Inxalenye yobunzima be-VCH inokutshintsha indlela i-propellant yakho ewohloka ngayo emva kokusetyenziswa. Ii-propellant ezinomthamo ophezulu we-VCH zinokuvelisa ezinye iimveliso ezingaphantsi ngexesha lokutsha. Ezinye zezi mveliso zingachaphazela umgangatho womoya. Xa ukhetha inxenye yobunzima be-VCH efanelekileyo, unceda ekunciphiseni ukukhutshwa komoya okuyingozi. Ungakhangela neendlela zokuphinda usebenzise okanye ukulahla i-propellant eseleyo ngokukhuselekileyo. Oku kunceda ukukhusela okusingqongileyo kwaye kugcine umsebenzi wakho unoxanduva.
Iprofayili yoKhuseleko
Ukhuseleko lubaluleke kakhulu xa uphatha iipropellants. Impembelelo ye-VCH mass fraction ekusebenzeni kwe-HTPB CAS 69102-90-5 Hydroxyl-terminated polybutadiene ibandakanya indlela ekhuselekile ngayo ipropellant yakho yokugcina, ukuxuba, kunye nokusebenzisa. Izifundo zibonisa ukuba ukutshintsha i-mass fraction ye-burn rate modifiers, njenge-BH-Fe, kunokwenza yonyusa izinga lokutsha ukuya kuthi ga kwi-12% ngaphandle kokutshintsha kakhulu i-exponent yoxinzelelo. Oku kuthetha ukuba ungayilungisa indlela esebenza ngayo ngaphandle kokwenza i-propellant ibe yingozi ngakumbi xa uphantsi koxinzelelo. Kufuneka wazi nokuba ii-propellant ezine-aluminium zihlala zixinene kunezo zine-BH-Fe, nto leyo enokuchaphazela indlela oziphatha ngayo nozigcina ngayo. Hlala ulandela izikhokelo zokhuseleko kwaye unxibe izixhobo zokukhusela xa usebenza nayo nayiphi na i-propellant.
Icebiso: Vavanya amaqela amancinci kuqala uze ugcine iirekhodi ezilungileyo. Oku kukunceda ukuba ubone imiba yokhuseleko kwangethuba kwaye kugcine iqela lakho likhuselekile.
I-VCH Mass Fraction efanelekileyo yee-Propellants ezisekelwe kwi-HTPB
Iziphumo zoPhando
Ungafumana izifundo ezininzi ezihlola eyona nxalenye ilungileyo ye-VCH mass fraction yee-propellants ezisekelwe kwi-HTPB. Abaphandi bavavanya amanqanaba ahlukeneyo e-VCH ukuze babone indlela esebenza ngayo i-propellant. Balinganisa amandla oomatshini, izinga lokutsha, kunye nokhuseleko. Uyabona ukuba uninzi lwezilingo zisebenzisa ii-VCH mass fractions phakathi kwe-2% kunye ne-8%. Olu luhlu lukunika ibhalansi phakathi kokuguquguquka kunye namandla.
Izazinzulu zihlala zixela ukuba iqhezu lobunzima be-VCH elimalunga ne-5% lisebenza kakuhle kwiindlela ezininzi zokusebenza. Ufumana ukuthamba okuhle, izinga lokutsha elithembekileyo, kunye nokukhupha amandla okuzinzileyo. Xa usebenzisa ngaphantsi kwe-2%, i-propellant iba lukhuni kakhulu kwaye ibe buthathaka. Ukuba usebenzisa ngaphezulu kwe-8%, i-propellant inokulahlekelwa ngamandla kwaye itshise ngokukhawuleza.
Icebiso: Ufanele uqale nge-VCH mass fraction ekufutshane ne-5% ukuba ufuna i-propellant ekhuselekileyo nesebenzayo.
Nantsi itheyibhile ebonisa indlela iinxalenye ezahlukeneyo zobunzima be-VCH ezichaphazela ngayo iimpawu eziphambili:
| Iqhekeza le-VCH Mass (%) | Amandla okuThamba (MPa) | Izinga Lokutsha (mm/s) | Ukuthamba (%) |
|---|---|---|---|
| 2 | 4.8 | 4.2 | 15 |
| 5 | 4.2 | 6.0 | 22 |
| 8 | 3.5 | 7.8 | 28 |
Ungabona ukuba ixabiso eliphakathi likunika ibhalansi engcono kakhulu. Ufumana amandla aneleyo kunye nokuguquguquka. Ukwafumana nesantya sokutsha esisebenza kwiirokethi ezininzi kunye nezixhobo.
Qaphela: Soloko uvavanya iisampulu zakho. Iziphumo zakho zingatshintsha ngokusekelwe kwezinye izithako kunye neemeko.
Imigangatho yoShishino
Kufuneka ulandele imigangatho yoshishino xa usenza iipropellants ezisekelwe kwi-HTPB. Le migangatho ikunceda uhlale ukhuselekile kwaye ufezekise iinjongo zokusebenza. Uninzi lwezikhokelo zicebisa iqhezu lobunzima be-VCH phakathi kwe-4% kunye ne-6%. Olu luhlu luhambelana neziphumo zophando kwaye lukunika iipropellants ezinokuthenjwa.
Ufumanisa ukuba iinkampani zeenqwelo-moya kunye nemibutho yokhuselo zisebenzisa imithetho engqongqo. Zifuna ukuba uvavanye ibhetshi nganye kwaye urekhode iqhekeza lobunzima be-VCH. Kufuneka ujonge ukuhambelana kunye nomgangatho. Ukuba usebenzisa i-VCH eninzi kakhulu, ubeka emngciphekweni iingxaki zokhuseleko. Ukuba usebenzisa kancinci kakhulu, i-propellant yakho isenokungasebenzi njengoko bekulindelwe.
- Inxalenye yobunzima be-VCH eqhelekileyo: 4% ukuya kwi-6%
- Uvavanyo luyafuneka: Amandla oomatshini, izinga lokutsha, kunye nokuhlolwa kokhuseleko
- Amaxwebhu: Rekhoda yonke ibhetshi kwaye ugcine iirekhodi zokhuseleko
Isilumkiso soKhuseleko: Soloko ulandela imithetho evela kushishino lwakho. Uzikhusela wena kunye nabanye xa usebenzisa iqhezu elifanelekileyo le-VCH mass.
Ungasebenzisa le migangatho ukukhokela umsebenzi wakho. Wenza iipropellant ezingcono xa ulandela izikhokelo eziqinisekisiweyo. Ukwanceda iqela lakho lihlale likhuselekile kwaye lifezekisa iinjongo zeprojekthi.
Iingcebiso Ezisebenzayo Zokulungisa i-VCH Mass Fraction
Ukukhetha i-VCH Mass Fraction efanelekileyo
Kufuneka ukhethe iqhezu lobunzima be-VCH elihambelana neenjongo zakho zeprojekthi. Qala ngokucinga ngento ofuna ukuba i-propellant yakho yenze. Ukuba ufuna ukuguquguquka okungakumbi kunye nokucutshungulwa okulula, khetha iqhezu lobunzima be-VCH eliphezulu. Ukuze ufumane amandla angakumbi kunye nokutsha kancinci, sebenzisa iqhezu lobunzima be-VCH eliphantsi. Uninzi lweengcali zicebisa ukuba uqale nge uluhlu oluphakathi kwe-4% kunye ne-6%Olu luhlu lukunika ibhalansi elungileyo yamandla, ukuguquguquka, kunye nokhuseleko.
Icebiso: Soloko uvavanya iibhetshi ezincinci ngaphambi kokuba wenze ubungakanani obukhulu. Oku kukunceda ubone iingxaki kwangethuba.
Kufuneka ugcine iirekhodi zebhetshi nganye. Bhala phantsi iqhezu lobunzima be-VCH kunye neziphumo ozibonayo. Oku kukunceda ufunde ukuba yintoni esebenza kakuhle kwiimfuno zakho.
Ukulungisa iifomyula zezicelo ezithile
Ungatshintsha ukusebenza kwepropellant yakho ngokulungisa i-VCH mass fraction kunye nezinye izithako. Umzekelo, ukongeza izilungisi zesantya sokutsha ezifana ne-BH-Fe kunokunyusa izinga lokutsha kunye ne-implitude ethile. Itheyibhile engezantsi ibonisa indlela amaxabiso ahlukeneyo e-BH-Fe achaphazela ngayo ukusebenza:
| Inxalenye yoBuninzi be-BH-Fe | Impembelelo kwizinga lokutsha | Impembelelo kwiNtshukumo ethile | Utshintsho lwe-Pressure Exponent |
|---|---|---|---|
| 0% | Isalathiso | Isalathiso | Isalathiso |
| 3% | Ukunyuka kwe-12% | Ukwanda | Utshintsho oluncinci |
| >3% | Ukwanda okungakumbi | Ukwanda kancinci kancinci | Utshintsho oluncinci |
Ukuba ufuna amandla okutsha ngokukhawuleza okanye angaphezulu, zama ukongeza i-3% BH-Fe. Uza kubona ukunyuka kwe-12% kwisantya sokutsha kunye ne-implitude ethile ephezulu, kunye notshintsho oluncinci kwindlela yokuziphatha koxinzelelo. Soloko ulungisa i-variable enye ngexesha kwaye uvavanye iziphumo. Ngale ndlela, unokuyilungisa i-propellant yakho kwiirokethi, ii-fireworks, okanye ezinye iindlela zokusebenzisa.
Uyibonile indlela impembelelo ye-VCH mass fraction esebenza ngayo kwisicelo I-HTPB CAS 69102-90-5 I-polybutadiene epheliswe yi-Hydroxyl Ubumba iziphumo zakho. Xa ulandela izikhokelo ezixhaswa luphando, uphucula ukhuseleko, ukusebenza kakuhle, kunye nokuthembeka. Uhlengahlengiso olucokisekileyo lukunceda ukuba wenze iipropellant ezingcono kwiimfuno zakho.
FAQ
Kwenzeka ntoni ukuba usebenzisa i-VCH eninzi kwi-propellant yakho?
Usenokubona i-propellant yakho itsha ngokukhawuleza kakhulu. Inokuba buthathaka kwaye ingakhuseleki ukuyiphatha.
Ulinganisa njani iqhezu lobunzima be-VCH?
Ulinganisa ubunzima be-VCH ngokwahlula ubunzima be-VCH ngobunzima obupheleleyo bomxube wakho we-propellant. Ngokwesiqhelo ubhala oku njengepesenti.
Ngaba ungayitshintsha i-VCH mass fraction emva kokuxuba?
Hayi, awunakutshintsha i-VCH mass fraction emva kokuxuba. Kufuneka ukhethe ubungakanani obuchanekileyo ngaphambi kokuba uqale.