Measuring and testing – Embrittlement or erosion
Patent
1989-02-27
1989-10-03
Tarcza, Thomas H.
Measuring and testing
Embrittlement or erosion
G01N 1700
Patent
active
H00006823
ABSTRACT:
In a method for determining and evaluating nozzle erosion rate, an eroding ozzle and a non-eroding nozzle are employed in a dual nozzle arrangement to receive a balanced thrust and flow rate from a common solid propellant grain of a solid propellant rocket motor when initially fired. When erosion of the eroding nozzle begins an increase in throat area results and the mass discharged through throat increases thereby causing an imbalance in thrust. The erosion is correlated to the mass flow rate of the solid propellant rocket motor by the mathematical relationships, F.sub.2 P.sub.C.sbsb.2 (A.sub.t.sbsb.2 +.DELTA.A.sub.t.sbsb.2)C.sub.F.sbsb.2, wherein F.sub.2 is force, P.sub.C.sbsb.2 is chamber pressure, A.sub.t.sbsb.2 is throat area, .DELTA.A.sub.t.sbsb.2 is change in throat area due to erosion, and C.sub.F.sbsb.2 is the thrust coefficient. Thus, the erosion rate of the eroding nozzle is determined and evaluated as a result of the increase of thrust and the flow rate which causes an imbalance in the thrust due to erosion products discharged and a change in value of the A.sub.t.sbsb.2 plus .DELTA.A.sub.t.sbsb.2.
Bush Freddie M.
Deaton James T.
Tarcza Thomas H.
The United States of America as represented by the Secretary of
Wallace Linda J.
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