Control of Fuel-Flow Rate

The mass generation rate in the gas generator is controlled by the variable flow system and the mixture ratio of fuel-rich gas to air in the ramburner is optimized. The burning rate is represented by the relationship r = ap , where r is the linear burning rate, p is the pressure, n is the pressure exponent of burning rate, and o is a con- 

Substituting Eq. (3.68) into Eq. (14.9), one obtains the gas generator pressure in a steady-state condition as 

4 Principle of the Variable Fuel-Flow Ducted Rocket 449 No 7.z e 

As shown in Fig. 15.5, when a pyrolant of high pressure exponent is used, the variable flow range is increased. However, it is evident from Fig. 14.6 that the pressure exponent is required to be n 1 for stable burning. It must also be noted that the temperature sensitivity of the pressure in the gas generator becomes high when a pyrolant of high pressure exponent is used. 

---