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为了研究不同喷注压降下液液同轴离心式喷嘴喷雾锥角的变化规律,采用高速摄像机观测喷雾形态。试验结果表明:内、外喷嘴单独工作时,喷雾锥角随着喷注压降的增加而增加。内、外喷嘴同时工作时,喷雾锥角随内喷嘴喷注压降的增加而减小,随着外喷嘴喷注压降的增加而增加。通过与内、外液膜同向旋转时喷雾锥角的变化规律对比,发现内、外液膜的旋转方向对外混式液液同轴离心式喷嘴喷雾锥角的影响不大,因为离心式喷嘴产生的锥形液膜的切向速度会很快转化为径向速度。由于液膜切向速度迅速转化为径向速度使得内、外液膜反向的动量转变为同向动量,从而造成利用角动量守恒来预测喷雾锥角的理论模型用于计算反向旋转的外混式喷嘴时存在较大误差。对于内、外液膜反向旋转的外混式喷嘴,由于液膜旋转方向对喷雾锥角的影响不大,可以按照同向旋转的公式进行计算。
In order to study the variation law of spray cone angle of liquid-liquid coaxial centrifugal nozzle under different injection pressure drop, the high-speed camera was used to observe the spray pattern. The experimental results show that the spray cone angle increases with the pressure drop of injection when the inner and outer nozzles work alone. When the inner nozzle and the outer nozzle work at the same time, the spray cone angle decreases with the increase of the pressure drop of the inner nozzle, and increases with the increase of the pressure drop of the outer nozzle. Through the contrast of the spray cone angle with the rotation of the inner and outer liquid films in the same direction, it is found that the rotation direction of the inner and outer liquid films has little effect on the spray cone angle of the outer mixed liquid-liquid coaxial centrifugal nozzle because the centrifugal nozzle The tangential velocity of the resulting conical liquid film quickly translates into radial velocity. Since the tangential velocity of the liquid film is rapidly transformed into the radial velocity, the inverse momentum of the inner and outer liquid films is transformed into the same momentum, resulting in a theoretical model that uses the conservation of angular momentum to predict the cone angle of the spray for calculating the reverse rotation Mixed nozzle there is a big error. For the inner and outer liquid film reverse rotation outside the mixed nozzle, due to the liquid film rotation direction of the spray cone angle is not affected, can be calculated according to the same direction of rotation formula.