汽化频率对压力振荡的响应：混合喷射状态的近似解析解
Vaporization frequency response to pressure oscillations: an approximate analytical solution for mixed injection regimes
摘要：
本文从理论上分析了在炉膛内反复喷射液滴的喷雾压力振荡的质量频率响应。一个单一的静止的球形液滴连续地被供给相同的液体燃料，使得其体积保持恒定，尽管蒸发，所谓的“平均液滴”在海德曼类比，代表这种蒸发喷雾。通过使用放置在平均液滴中心处的源点以液-液传热系数实现供给，使得在该过程期间液滴内部仅允许径向热对流和传导效应。该供给过程现在被视为适当的边界条件，该边界条件是控制液体燃料喷射到炉膛中的过程的混合或广义供给状态。利用基于瑞利准则的线性分析，评估蒸发质量响应因子。分析了传热系数和过程特征时间的变化对传热性能的影响。当燃料热力学系数接近某一特定值时，响应出现突然增加。
英文摘要：
This work is devoted to a theoretical analysis of mass frequency response to pressure oscillations of a spray of repetitively injected drops into a combustion chamber. A single stationary spherical droplet continuously fed with the same liquid fuel so that its volume remains constant despite the evaporation, the so-called 'mean droplet' in the Heidmann analogy, represents this vaporizing spray. The feeding is realized with a liquid-liquid heat transfer coefficient by using a source point placed at the mean droplet centre, in such a way that only radial thermal convection and conduction effects are allowed inside the droplet during the process. This feeding procedure is now viewed as a proper boundary condition that is a mixed or a generalized feeding regime controlling the liquid fuel injection process into the combustion chamber. Drawing upon a linear analysis based on the Rayleigh criterion, the evaporating mass response factor is evaluated. Effects due to the variation of the heat transfer coefficient and that of the process characteristic times are analysed. An abrupt increase appears in the response when a fuel thermodynamic coefficient approaches a particular value.
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