旋流加力室火焰前锋的计算

一、基本方程 1.微分方程 计算旋流加力室火焰前锋的位置,基于气泡理论。由于旋转力场,冷气流离心向外运动,迫使径向点燃的火焰微团向心运动。火焰微团的位置由轴向和径向速度来确定。假设这两个运动是独立的。轴向运动由冷的未燃气体算出,因压力损失,速度随管长增加;火焰微团的径向运动可由下列方程描述:

PREDICTION OF THE FLAME FRONT IN AN AUGMENTOR WITH SWIRLING FLOW

A computing program has been worked out for prediction of the flame front in a swirl augmentor. The positions of flame front and the coefficients of pressure loss have been calculatedfor a variety of swirl angles. The results of the analysis indicate that the ratio of the length of flame front to the diameter of augmentor equals 1.2 (L/D=1.2) when the swirl angle of 45° is selected. The coefficient of pressure loss in the swirl augmentor is not larger than that of a conventional afterburner. There is no obvious effect of pressure on the position of flame front.