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

Test Results

            MR = Mixture Ratio from 0.2 through 3.9
            CP  = Chamber Pressure from 0.2MPa (29psi) through 2.1MPa (305psi)

Yes.. We also had trouble in the past

Picture
Partly melted injector and mixing head

Picture
Partly melted mixing head

Picture
Partly melted injector