A successful ignition is the consequence of corresponding conditions of fuel mass flow rates, mixture ratio, as well as initiation energy in time and space. If ignition does not take place accurately, serious damages can take place within or outside the engine. The dynamical behavior of the combustion chamber was investigated during ignition. Single shear coaxial injector combustion chamber test case is used in the present study. At the time of propellant injection, mostly the pressure and temperature remain subcritical. When injected these increases promptly and convert into supercritical conditions. The thermodynamic state usually changes from subcritical to supercritical during ignition. Navier Stokes equations along with Soave Redlich Kwong equation model has been applied during steady-state, while transient simulations with ideal gas assumptions are performed to analyze the dynamical behavior of the combustor. All the simulations were performed in the present study using the ANSYS Fluent 16.2 code. The computational findings have strong analytical consistency with the experimental data. Due to inappropriate modeling of the equation of state and limited information about initial and boundary conditions for ignition transient results have some differences with experimental data. The difference between the observed chamber pressure during the experiment and numerical computation using 0.4 RFL value is only 2 bar (approximately 7% difference).

成功点火是燃料质量流量，混合比以及时间和空间初始能量的相应条件的结果。如果点火不正确，则在发动机内部或外部可能会造成严重损坏。在点火过程中研究了燃烧室的动力学行为。本研究使用单剪切同轴喷油嘴燃烧室测试案例。在喷射推进剂时，大部分压力和温度仍处于亚临界状态。当注射时，这些迅速增加并转变成超临界条件。在点火期间，热力学状态通常从亚临界变为超临界。Navier Stokes方程以及Soave Redlich Kwong方程模型已在稳态下应用，同时进行具有理想气体假设的瞬态模拟，以分析燃烧室的动力学行为。在本研究中，所有仿真均使用ANSYS Fluent 16.2代码进行。计算结果与实验数据具有很强的分析一致性。由于状态方程建模不当，有关点火瞬态结果的初始条件和边界条件的信息有限，因此与实验数据存在一些差异。实验期间观察到的腔室压力与使用0.4 RFL值进行的数值计算之间的差异仅为2 bar（相差约7％）。计算结果与实验数据具有很强的分析一致性。由于状态方程建模不当，有关点火瞬态结果的初始条件和边界条件的信息有限，因此与实验数据存在一些差异。实验期间观察到的腔室压力与使用0.4 RFL值进行的数值计算之间的差异仅为2 bar（相差约7％）。计算结果与实验数据具有很强的分析一致性。由于状态方程建模不当，有关点火瞬态结果的初始条件和边界条件的信息有限，因此与实验数据存在一些差异。实验期间观察到的腔室压力与使用0.4 RFL值进行的数值计算之间的差异仅为2 bar（相差约7％）。