Abstract Experimental data on the efficiency of a gas-drop cooling on an adiabatic wall at various temperatures of the external flow and concentrations of the liquid phase were analyzed. Air was used as a gas phase; water was used as a liquid phase. A model for generalization of the measurement results, based on the constancy of temperatures and concentrations of components near the adiabatic wall, as well as the state of vapor phase saturation, is proposed. The distribution of the vapor concentration near the wall is studied, and a generalization of the experimental data on a change in the components of the vapor‒gas‒droplet mixture with variations in temperature and concentration conditions at the inlet is obtained using the asymptotic approach. The parameter of thermal efficiency of cooling, recorded by means of the total enthalpies of the vapor-gas and liquid phases on the wall, in the gap and in the flow core, taking into account the heat of phase transition, allowed generalization of the experimental data in the framework of the asymptotic approach of the Kutateladze – Leontiev theory of film cooling. The obtained relationships on component concentration and efficiency of a two-phase wall jet allow us to evaluate the thermal state of surfaces when they are protected by gas-droplet curtains. It was found that the thermal efficiency parameter of the two-phase curtain can be 3–5 times higher than in the single-phase cooling regime with a relatively low mass content of the droplet phase in the wall film, not exceeding 2% by mass. The obtained relations for the concentration of components and effectiveness of a two-phase wall jet make it possible to estimate the thermal state of surfaces protected by the gas-droplet cooling.

中文翻译：

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液相温度和浓度对气体-液滴冷却效率的影响

摘要 分析了在不同外流温度和液相浓度下绝热壁上气滴冷却效率的实验数据。空气用作气相；水被用作液相。提出了一种基于温度恒定性和绝热壁附近组分浓度以及气相饱和状态的测量结果概括模型。研究了靠近壁面的蒸气浓度分布，利用渐近法得到了入口温度和浓度条件变化时蒸气-气体-液滴混合物组分变化的实验数据的概括。冷却热效率参数，通过壁上、间隙中和流动核心中的气相-气相和液相的总焓记录，考虑到相变热，允许在渐近方法的框架内推广实验数据Kutateladze-Leontiev 薄膜冷却理论。获得的两相壁射流的组分浓度和效率关系使我们能够评估表面受到气滴幕保护时的热状态。发现两相幕的热效率参数可以比单相冷却方案高 3-5 倍，壁膜中液滴相的质量含量相对较低，不超过 2% .