An impartial review of the rise and progress of the by Charles Pettit

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By Charles Pettit

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The engines were mounted in a "sea level" stand with the tubing schematic as shown in Figure 13. Propellants were maintained at the engine inlets under 20 psig blanket p r e s s u r e during hold periods. The standard duty cycle f o r these tests consisted of three pulses: 250 milliseconds on 500 milliseconds off, 65 milliseconds on - 500 milliseconds off, and 65 milliseconds on. The initial engine tested (TRW SN 585) exhibited a P c of 99 p s i a and O/F ratio of 1. 630. After a 5-day hold period, the engine w a s tested again, using the identical inlet p r e s s u r e s as the first run.

Photographs were made and views of the contaminated portions of the injector are shown in Figures 14 to 17. Figure 14 shows the contamination in the oxidizer tubes entrance flange. Figure 15 shows the same view of a flange that had been cleaned. The other two photographs illustrate the difference in amount of corrosive attack on the front face of an injector at the outlet of the oxidizer tubes for two injectors, one which w a s used in this test ( Fig. 16) , and one used in early system tests (Fig.

150 LB THRUST TRW ENGINE TRW INJECTOR +I 3 , TO FACILITY BLEED LINE GHeSUPPLY I 10 MICRON NOMINAL FILTER VENT VALVE I - 1/2 IN. I 26 GALLON RUN TANK 1/2 IN. TO 3 FT. DIAMETER ALTITUDE CELL PREVALVE FLOWMETER TO APS MODULE w w FIGURE 13. FACILITY SCHEMATIC FOR TRW ENGINE "SEA LEVEL" TESTS AND INJECTOR FLOW TESTS TO SCRUBBER TRW Injector Flow Testing The particulate matter discovered in the oxidizer injector feed tubes in engine 585 prompted a series of injector flow tests. The injector was removed from a TRW engine previously fired at MSFC in APS module performance testing, and special connectors were fabricated to mate the injector oxidizer inlet fitting to the facility oxidizer supply line.

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