Inlet layout effects on the mixing performance with a novel mixing evaluation in a powder-fueled ramjet

• Mixing process is crucial for ignition and combustion in powder-fueled ramjets. The mixing performance depends mainly on the inlet layout. In this study, the effects of four popular inlet layouts were investigated and were found to significantly influence the particle distribution. In this study, the Savitzky-Golay approach was used to handle large amounts of data on particles to obtain clear peaks and smooth curves. A novel mixing evaluation method was proposed for exploring the mixing enhancement mechanism further. The mixing performance analysis in the X-direction was conducted using the mixing quality index. The four-inlets scheme has similar mixing quality with the two-inlets scheme with an inlet angle of 180°, and higher than the others. The qualitative and quantitative evaluations in the Y- and Z-directions were conducted using the percent frequency and the Kullback-Leibler divergence. The Kullback-Leibler divergence of the four-inlets scheme was more than 29.9% lower than the others. However, a considerable momentum loss and travelling time through entire turbulent eddy cannot be prevented in this scheme.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

Nyckelord

Inlet layouts

Kullback-Leibler Divergence

Mixing

Powder-fueled ramjet

Publikations- och innehållstyp

art (ämneskategori)

ref (ämneskategori)