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Ramjet Fuel Systems

The ramjet—fuel system comprises those elements of the 
ramjet power plant necessary for the delivery of fuel into the 
engine air stream in the quantity necessary to maintain the en— 
gine thrust required for missile f Since ramjet engines 
under development thus far have used liquid-hydrocarbon fuels 
almost exclusively, this chapter will be restricted to this 
type of fuel. 
The thrust level Of an engine may be controlled by vary— 
ing one Of t vo factors, the fuel f IOW or the air f IOW. The ad— 
justment Of the fuel flow affords the simplest means for ac— 
complishing this operation. Variation of the air flow provides 
an alternate means for such adjustment but is undesirable 
be— 
cause of the massi veness of the devices required , 
Generally I Iquid—fuel systems must prov ide storage , 
pres— 
sure, flow—control, and distribution Of the fuel into the air 
stream at the points of injection. Although conventional 
engi — 
neering techniques already exist for the design or an adequate 
fuel system, a proper understanding of the boundary conditions 
peculiar to the ramjet power' plant are necessary for making the 
proper choice among these techniques. This discussion of ram— 
jet—fuel systems vill draw principally from the experience 
ga thered in designing fuel systems for missi les where high ma— 
lit y and rapid change Of maneuver are required. An 
effort be made, however, to distinguish between the pe— 
culiar needs of a part icular missile and the general ramjet 
requirements .