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2020 AIAA SciTech Forum

CRAFT Tech will be at the 2020 AIAA SciTech Forum held in Orlando, Florida from January 6-10. Stephen Barr will be presenting in the Numerical Analysis of Ramjet/Scramjet Engines II session on Wednesday, January 8th at 3PM EST.

Topic: Large Eddy Simulation of an Optimized Highly-Compact Supersonic Inlet Featuring Internal Compression Spikes


In this study, a Delayed Detached Eddy Simulation (DDES) of a highly-compact supersonic inlet with internal compression spikes is performed. The inlet geometry is from an earlier Reynolds Averaged Navier Stokes (RANS) based design optimization study[5] in which pressure recovery was maximized and circumferential distortion intensity was constrained at the aerodynamic interface plane (AIP). The objective of the current work is to assess the time-dependent efficiency and distortion metrics of the inlet, and to determine whether RANS function evaluations are adequate to characterize the performance of designs in the optimization. Results show that time-averaged flow quantities from the DDES solution match reasonably well with the RANS simulation. Total pressure recovery at the AIP was found to differ by less than 2% between the time-averaged DDES and RANS solutions. Differences in distortion metrics at the AIP between the two solution methodologies were higher with a 10% difference in circumferential distortion intensity. Finally, the effect of having the internal compression spikes in the inlet geometry is investigated to understand its relevance to overall performance of the inlet.

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