Physical insights into multi-point global optimum design of scramjet intakes for ascent flight

Fujio, Chihiro; Ogawa, H.

doi:10.1016/j.actaastro.2022.01.036

Cited by 13 publications

(3 citation statements)

References 40 publications

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“…E tot ). The total exergy destroyed in the Busemann inlet was decomposed into three parts, as shown in Equation (7). The total incoming exergy in Busemann inlets is equal to the sum of the mechanical exergy and the thermal exergy of the airflow, as shown in Equations ( 5) and (6).…”

Section: Performance Indicatorsmentioning

confidence: 99%

“…The total exergy at the entrance and exit of the control volume can be calculated by adding mechanical exergy and thermal exergy according to Equations ( 5) and ( 6), and then the loss of exergy in the control volume was obtained by subtracting the total exergy at the exit from that at the entrance. On the other hand, the total loss of exergy can also be obtained by summing all the anergy production (shock wave anergy, thermal anergy and viscous anergy) in the control volume according to Equation (7). Theoretically, the exergy losses calculated by these two methods should be completely equal.…”

Section: Exergy Distribution Quantitative Analysismentioning

confidence: 99%

“…The startability [5] and flow quality [6] of the modified wavecatcher Busemann-based intakes were studied by Zuo and Mölder. A multi-point optimum design of an axisymmetric intake for ascent flight were conducted by Fujio [7].…”

Section: Introductionmentioning

confidence: 99%

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Control-Volume-Based Exergy Method of Truncated Busemann Inlets in Off-Design Conditions

Zhu,

Zhou,

Liu

et al. 2024

Processes

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A scramjet engine consisting of several components is a highly coupled system that urgently needs a universal performance metric. Exergy is considered as a potential universal currency to assess the performance of scramjet engines. In this paper, a control-volume-based exergy method for the Reynolds-averaged Navier–Stokes solution of truncated and corrected Busemann inlets was proposed. An exergy postprocessing code was developed to achieve this method. Qualitative and quantitative analyses of exergies in the Busemann inlets were performed. A complete understanding of the evolution process of anergy and the location where anergy occurs in the inlet at various operation conditions was also obtained. The results show that the exergy destroyed in the Busemann inlet can be decomposed into shock wave anergy, viscous anergy and thermal anergy. Shock wave anergy accounts for less than 4% of the total exergy destroyed while thermal anergy and viscous anergy, in a roughly equivalent magnitude, contribute to almost all the remaining. The vast majority of inflow exergy is converted into boundary pressure work and thermal exergy. Some of the thermal exergy excluded by the computation of the total pressure recovery coefficient belongs to the available energy, as this partial energy will be further converted into useful work in combustion chambers.

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Section: Performance Indicatorsmentioning

confidence: 99%

Section: Exergy Distribution Quantitative Analysismentioning

confidence: 99%