Исследование нестационарного горения заряда в модельной твердотопливной регулируемой двигательной установке

Abstract

Based on the coupled combustion model of mixed solid fuel, unsteady combustion of fuel was studied when the pressure was changed in the combustion chamber of a model controlled small solid fuel engine. Modeling of engine thrust control system was carried out in two ways: by changing the critical section area of the nozzle over time according to a given law and by changing the area of the burning surface of the fuel according to a given law. It is found that with a sharp increase in pressure, the combustion rate increases above the quasi-stationary value, which leads to an increase in the pressure in the combustion chamber above that calculated from the quasi-stationary rate. With a sharp decrease in pressure, the combustion rate decreases to a value less than the quasi-stationary rate at the corresponding pressure. The decrease in the combustion rate leads to a decrease in the pressure in the combustion chamber below that calculated from the quasi-stationary rate. At small values of the characteristic relaxation time of the combustion chamber, a sharp decrease in pressure in the combustion chamber will lead to the extinction of the charge combustion.