DARMA Technology Inc
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Unit-Injector Chamber

     - to check combustion performance (stability) with variants, especially, in low mixture ratio under low chamber pressure
     - to use replaceable injector
     - nominal (design) condition 
           chamber pressure = 1.5MPa (220psi)
           mixture ratio           = 3.0
           thrust (sea)             = 340N (75lb)
           total massflow        = 112g/sec (0.25lb/sec)
           expansion ratio      = 10 
           number of injector = 1
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Test Results

            MR = Mixture Ratio from 0.2 through 3.9
            CP  = Chamber Pressure from 0.2MPa (29psi) through 2.1MPa (305psi)
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Yes.. We also had trouble in the past

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Partly melted injector and mixing head

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Partly melted mixing head

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Partly melted injector

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