论文部分内容阅读
为了解决冲压发动机被动热防护结构在长时间、狭小空间、大温度梯度下的隔热问题,提出了多层组合梯度隔热方案。通过不同构型的梯度隔热层的氧乙炔实验研究,优化了梯度隔热层的构型,并对优化后的梯度隔热材料的隔热性能进行了冲压发动机试验验证。研究表明:2100K的高温下柔性梯度隔热层具有良好的隔热性能,能够解决狭小空间、大温度梯度条件下,冲压发动机长时间工作的隔热问题;梯度隔热材料的层数影响隔热层的隔热性能,较多的层数可提高柔性梯度材料的整体隔热性能;梯度隔热材料的隔热性能可采用氧乙炔隔热实验进行表征。
In order to solve the heat insulation problem of the passive thermal protection structure of ramjet in a long time, a small space and a large temperature gradient, a multi-layer combined gradient heat insulation scheme is proposed. Through the experiment of oxyacetylene with different configurations of gradient insulation layer, the configuration of gradient insulation layer is optimized, and the heat insulation performance of the optimized gradient insulation material is verified by stamping engine test. The results show that the flexible gradient insulation at 2100K has good thermal insulation properties, which can solve the problem of long-time thermal insulation of ramjet engine under the conditions of narrow space and large temperature gradient. The number of layers of gradient insulation affects the thermal insulation The thermal insulation performance of the layer and the more layers can improve the overall thermal insulation performance of the flexible gradient material. The thermal insulation performance of the gradient thermal insulation material can be characterized by the oxyacetylene thermal insulation experiment.