塞式喷管发动机的性能预示

采用理论分析的方法并结合塞式喷管的结构特点，建立塞式喷管壁面的的压力分布模型，对全长型、截短型以及考虑底部推力、底部二次流等情况下的塞式喷管发动机进行了性能预示，并同试验结果进行了对比分析。分析结果表明，塞式喷管发动机的性能预示结果同试验结果吻合较好，验证了预示模型的可行性，但是在某些工作压比下，预测值与试验值之间还有一定程度的差异，塞式喷管发动机的性能预示模型还有待进一步的完善。

Performance Evaluation of Plug Nozzles

In this paper, the study was to obtain the performance of plug nozzles rapidly and correctly. The performance evaluation models of the plug nozzles for different conditions were established by theoretical analysis with combination of the flow phenomena in plug nozzles. Based on the performance evaluation models, performance for the plug nozzles was foreshowed, including the full length plug nozzle, the truncated central body and the plug nozzles with base pressure and the base second flows. Through comparison and analysis, the results got from the models were quite consistent with experiment results, implying that the performance evaluation models of plug nozzles are effective. Bat, in a certain extent there are some differences between experiments and evaluation values. The performance evaluation models for plug nozzles should be perfected more.