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The flowfield and performance analyses of turbine-based combined cycle inlet mode transition at critical/subcritical conditions

机译：临界/亚临界条件下基于涡轮的联合循环进气模式转换的流场和性能分析

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The fluid dynamics and performance analyses of steady and continuous combined cycle inlet mode transition at critical/subcritical conditions were investigated through wind tunnel tests and three dimensional unsteady numerical simulations. When the inlet operated at critical condition, the terminal shock was unsteady and oscillated in the frequency between 40 Hz and 60 Hz around the shoulder of inlet and the downstream of cowl leading edge. In critical inlet mode transition the performance parameters of diffuser exit varied with positions of terminal shock. When the inlet operated at subcritical condition, terminal shock was steady at the upstream of cowl leading edge. The continuous mode transition test results reveal that the shock can be steady at subcritical condition. Considering the shock stability and performance parameters at the diffuser exit, subcritical inlet mode transition is better than critical condition for combined cycle inlet investigated in this paper. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译：通过风洞试验和三维非稳态数值模拟，研究了临界/亚临界条件下稳态和连续联合循环进气道过渡的流体动力学和性能分析。当入口在临界条件下运行时，终端冲击不稳定，并在入口的肩部和前围前缘的下游周围以40 Hz至60 Hz的频率振荡。在临界进气模式转换中，扩压器出口的性能参数随终端冲击的位置而变化。当入口在亚临界条件下运行时，在前围前缘的上游，终端冲击稳定。连续模式过渡测试结果表明，冲击在亚临界条件下可以保持稳定。考虑到扩压器出口处的冲击稳定性和性能参数，本文研究的亚临界进气道模式过渡优于联合循环进气道的临界条件。 （C）2017 Elsevier Masson SAS。版权所有。

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