Apollo Saturn Manual do Utilizador descarregar pdf (Página 43)

F-I En_2_.IneOperation

The F-I engine is started by ground support equipment. Ground fluid pres-

,:_. r s ports in the main LOX valves. Opening of the main LOX valves admits

,0.. _ r tank pressure to the thrust chamber and allows control fluid to enter

the gas generator. Opening of the gas generator va]ve permits LOX and RP-I to

enter the gas generator combustion chamber where they are ignited by the turbine

:. ,:xhaust igniters, k_ile the RP-I reache.= ,"_proximately 375 psiF_ a valve in the

hypergol cartridge opens allowing LOX and ]_-i to build up pressure against the

hypergol burst diaphragm. At approximately 500 psig the diaphragm ruptures

allowing hypergol and RP-I to enter the thrust chamber causing spontaneous

combustion upon contact with the LOX, thereby estahlishing primary ignition.

As thrust pressure builds up the RP-I valves open admitting RP-I to the thrust

,: chamber and the tr_nsistion to mainstage operation is achieved.

Th( inboard engine engine is cutoff by a signal from the IU. Outboard engines are

cutoff oy optical type LOX depletion sensors with fuel depletion sensors as back-

up. A command from the IU supplies a command to the switch selector to enable

the outboard engine cutoff circuitry. W11en two or more of the four LOX level

sensors are energized, a timer is activated. Expiration of the timer energizes

• a stop solenoid for each engine which energizes the main LOX and main RP-I valves.

: _ TI, sequence closing of the main LOX valve followed by sequence closing of the

main RP-I valve interrupts propellant flow and terminates engine operation.

Enq'lne. Confrol Valve "Open" 5i.3n_t .- -

_:-. Oxb_i_r Va|vcs Open _=_ -_- _ I

O,_s Oznerat"=, _4alvz _ _ r_ "

Open

Gas (_r_ra_r P,'op¢|len_" lO,,;i';on

lqnt%¢r Fud Velw. Open

H_pergot Cm*#ridge Rup%v'e -'_'_

;_ Thrus+ thambc.r l,:jn'_i"mn .... ,,"

; F_I Valv_._ Open I

; _ 5%a_ o_ Thrus# Increase II

,_ "; =Th_usf O_" ._ignel ""

90 P_¢nt En(jir_ ThruM" '"

5tad- 5¢quencL Co_ple%4. lIP

" I I I I I

0 I Z 3 4 5 &

• Enqin¢ 5%art 5¢quenc¢ in ._conds _¢rom Con%rot VsNt. "Open" _igna_

, , q

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Apollo Saturn Manual do Utilizador Página 43