采用同心管喷嘴的燃烧室性能与系数φ有关,该系数是根据阿布拉莫维奇提出的、具有高密度比的两种流体的混合率关系式建立的。此关系式可以用于最佳化的同心管喷嘴设计。同时也可解释一些明显异常的试验结果,即为什么增加氢气速度往往没能提高性能,甚至还有损失,或者,为什么增加喷嘴槽深往往对性能的影响很小。该关系式已用于提高阿里安火箭第三级的HM-7氢氧发动机的性能。 Combustion chamber performance with a concentric tube nozzle is related to the coefficient φ established by the mixing ratio of two fluids with a high density ratio proposed by Abramovich. This relationship can be used to optimize the concentric tube nozzle design. It also explains some of the most noticeable abnormalities in the test results, namely, why increasing the hydrogen velocity often fails to improve performance, even with loss, or why increasing the nozzle slot depth often has little effect on performance. This relationship has been used to improve the performance of Alien Rocket Level 3 HM-7 oxyhydrogen engines.