In order to meet stringent regulations , the secondary air injection ( air ) system should be added to work with the catalyst 为了满足比较严格排放限值，催化转化器常常与二次空气喷射技术配合使用。
Results indicated that the friction reduction of ship flat bottom is proportional to the air injection ratio and adversely proportional to the distance from the injection 计算结果表明，平底船的减阻率与喷气率成正比，而与离喷气口距离成反比。
The results predict the local friction reduction increases with the air injection ration hut decreases with the distance - away from the injection , which is in conformity with experiments 结果预示，随着喷气率增大，局部减阻率增加，但离喷气口的距离越远，局部减阻率减小。
Result of numerical simulation shows that the grads of continuous phase " s velocities decreases with the presence of microbubble of which the diameter is 100 / / w , the profiles of air volume fraction in the boundary layers is similar to triangle or echelon , affected by interaction among the particle , there is a saturated air fraction , within the scope of saturated air fraction , increasing the air injection ratio can accrete the friction reduction ratio , under the condition of same air injection ratio , the free - steam velocity is larger , the effect of friction reduction is worse 计算结果表明，直径为100 m的微气泡能减小近壁面连续相的速度梯度；微气泡在边界层中的浓度分布近似为三角形或梯形分布；受粒子间相互作用的影响，存在一饱和浓度；减阻率随喷气量的增大而增大，直至饱和喷气量，此后，增大喷气量，壁面摩擦阻力变化不大；相同喷气量下，来流速度越大，减阻率越低。
