1. [1,2] present the history of hybrid propulsion, starting in the 1940 's with various liquid oxidizers (HNO, H202, N204".) and various solid fuels (commercial polymers. amines). The work of ONERA, which went in the eady [970's as far as experimental sounding rockets. is found in particular in reference [2].
2. The description of the diffusion flame heat flux was established in the 1960's. An attempt is made to utilize it for correlating results obtained on small laboratory motors, in particular at ONERA (with the use ofan ultrasonic technique for measuring the regression rates), with a very wide range ofstream parameter values (speclfic mass flow rate, temperature, cr content). '-=<"
3. The ablation rate results from the coupling with the condensed phase process, which is described by an approach proposed in the early 1970's and used successfully for a number of polymers as well as various solid propellants. This approach extrapolates the results of bulk degradation to the regression regime for which temperatures higher by about 200°C are reached.
4. The physical and thermal characteristics used for PE Pp =0.95 gIcm3,cp=0.3 calIg-K, \ = 3.7 10-4 cal Icm-s-K, dp= 1.3 10.3cm2Is.