论文部分内容阅读
本文对那些最强烈影响侵蚀燃速随大发动机尺寸而变化的因素作用进行了测量,提出了侵蚀燃烧临界条件的尺度准则,给出了控制侵蚀燃烧现象有关参数变化时,对侵蚀开始出现的转变尺度临界条件度量的一系列发动机试验结果。试验结果和分析表明,侵蚀燃烧随推进剂燃速、发动机压力、质量流率的变化趋势和已有文献报导的结果相一致。绘出燃速增量与横向流速、比质量流率或横向流雷诺数的关系曲线,并不能提供必需的临界条件尺度相关性。对于湍流转变和侵蚀临界条件的速度分布来说,横向流雷诺数与燃面退移雷诺数间的尺寸相关性,说明了发动机中位置/流动历程的影响。将燃面退移雷诺数转变成轴向位置为特征尺寸的雷诺数时,可将临界条件尺度位置的依赖性归并为一条幂次相关曲线。
In this paper, the most influential factors that affect the burning rate of erosive combustion with the size of a large engine are measured. The criterion for the critical conditions of combustion combustion is proposed, and the change to the erosions when the relevant parameters of the erosive combustion phenomenon are controlled is given A series of engine test results measured in terms of criticality conditions. The test results and analysis show that the trend of erosion combustion with the burning rate of propellant, engine pressure and mass flow rate is consistent with the results reported in the literature. Plotting the relationship between incremental and lateral flow velocities, mass flow rates, or cross-flow Reynolds numbers does not provide the necessary criticality-scale correlation. For the velocity distribution of turbulent transitions and erosion critical conditions, the size dependence of the Reynolds number on the crossflow and the Reynolds number on the face of the combustion surface shows the effect of the position / flow history in the engine. When the Reynolds number of the combustion surface is transformed into the Reynolds number with the axial position as the feature size, the dependence of the critical condition scale position can be merged into a power-related curve.