组合发动机一体化氦加热器设计与性能分析OA北大核心

To address the issues of high weight and complex structure in the split-type helium heater used in precooled air-breathing combined cycle engines,a novel helium heater integrated gas generator and heat exchange is proposed.A heat transfer design and performance analysis model,along with a three-dimensional numerical simulation model,are developed for this novel integrated helium heater.The effectiveness of the configuration design is validated,and the influences of spacing between microtubes and microtube layers on heat transfer performances are evaluated.The findings are as follows:the integrated helium heater eliminates the need for a gas generator and corresponding active cooling equipment,thereby reducing the system weight and complexity;compared to interlayer spacing,row spacing has a greater impact on flow and heat transfer performance,a row spacing(S1/d)of 2.0 is appropriate,and the interlayer spacing should ideally match the row spacing value.Increasing the number of radial layers enhances the overall heat transfer coefficient and performance,but also increases flow resistance and nozzle count.A balanced consideration of heat transfer,flow resistance,and structural factors is needed to achieve the optimal number of radial and axial layers.