Regenerative cooling is critical for hypersonic propulsion systems, wherein the flow and heat transfer characteristics of the hydrocarbon fuel in the cooling channel are crucial. The most commonly used existing evaluation models for flow and heat transfer characteristics use one-step overall reaction endothermic pyrolysis; however, they are limited to mildly cracked hydrocarbon fuel working conditions. To quickly evaluate the flow and heat transfer characteristics of hydrocarbon fuel under both mild- and heavy-cracking conditions, a quasi-one-dimensional model was established in this study; considering 18 species and 24 reactions, and a simplified mechanism of n-decane. The flow and heat transfer characteristics under different cooling channel lengths and heat fluxes were studied. The results show that the proposed model has fast flow and heat transfer characteristics evaluation capability, and small persistent errors. Furthermore, the calculation results under different inlet fuel mass flow and heat flux working conditions showed that the hydrocarbon fuel flow and heat transfer characteristics vary with the fuel mass flow and heat flux, which can enhance both heat transfer and deterioration. The influence of the heat flux can be used to measure the fuel temperature inside the channel.

再生冷却对于高超音速推进系统至关重要，其中冷却通道中碳氢燃料的流动和传热特性至关重要。现有的流动和传热特性最常用的评估模型使用一步全反应吸热热解；然而，它们仅限于轻度裂化的碳氢燃料工作条件。为了快速评估轻裂解和重裂解条件下碳氢燃料的流动和传热特性，本研究建立了准一维模型；考虑 18 种物质和 24 种反应，以及正癸烷的简化机制。研究了不同冷却通道长度和热通量下的流动和传热特性。结果表明，该模型具有快速的流动和传热特性评估能力，且持续误差小。此外，不同进口燃料质量流量和热通量工况下的计算结果表明，碳氢燃料的流动和传热特性随燃料质量流量和热通量的变化而变化，这可以增强传热和劣化。热通量的影响可用于测量通道内的燃料温度。这可以增强传热和劣化。热通量的影响可用于测量通道内的燃料温度。这可以增强传热和劣化。热通量的影响可用于测量通道内的燃料温度。