forced mixer lobes in ejector designs

Mixing and combustion augmentation of the RBCC with different

Sep 01, 2020 · The lobed mixer with unique flow field is applied to RBCC engine. • The tearing of the vortex structure promotes the mutual penetration depth. • The lobed mixer and the rectangle mixer retain the best mixing performance. • Decreasing the number of lobes is beneficial to augment the mixing performance. •

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US5884472A - Alternating lobed mixer/ejector concept

A mixer/ejector suppressor is disclosed for reducing the noise level created by the exhaust flows in gas turbines. In the preferred embodiment, the suppressor comprises a mixing ring of alternating lobes attached to the engine's tailpipe; an ejector shroud mounted onto the mixing ring; and a plurality of arcuate gaps, between the mixing ring and ejector shroud, that permit ambient air to be ...

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TF-CLAWS: Candidate Low-Bypass, Mixed-Flow Turbofan

Aerospace Engineering Department ii Abstract The TF-CLAWS is a two-spool, mixed flow, low bypass ratio turbofan engine designed as a candidate for an advanced trainer capable of replacing the T-38.

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Ejector pump enhanced high pressure EGR system - Cummins

Mar 18, 1997 · The ejector 15 is of the lobed mixer type ejector shown in FIGS. 4A, 4B and 5A, 5B. This ejector is of a known type (see above-mentioned Skebe et al. article) which has two identical lobe surfaces. The ends of the lobed surface 50 are attached to side plates 52 to establish the correct relative angles.

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Fixed geometry mixer/ejector suppression system for turbofan

It has been found that a mixer nozzle having twenty lobes results in a one-half percent efficiency loss compared to a mixer nozzle having twelve lobes. Flow mixer 12, exhaust nozzle 14, ejector 16 and ambient air inlet 40 are employed in a fixed geometry arrangement, that is, there are no moving parts.

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Investigation on Incompressible Lobed Mixer-Ejector

Forced mixer lobes in augmentor primary ejectors obtain a 100-percent increase in pumping over conventional design, together with nearly complete mixing in very short mixing ducts, through the ...

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NASA Technical Reports Server (NTRS

The tests evaluated the impact of various geometric and design parameters on the noise generated by a two-dimensional (2-D) shrouded, 8-lobed, mixer-ejector exhaust nozzle. The shrouded mixer-ejector provides noise suppression by mixing relatively low energy ambient air …

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Forced mixer lobes in ejector designs | Journal of

Forced mixer lobes in ejector designs. ... The mixing characteristics of forced mixers with scalloped lobes. ... Full Navier-Stokes analysis of a two-dimensional mixer/ejector nozzle for noise suppression. JAMES DEBONIS; 17 August 2012. Volume 4, Number 4 July 1988. Crossmark.

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Multi-Stage Mixer/Ejector Systems | Request PDF

Forced mixer lobes generate large scale axial vorticity which results in rapid mixing and improved diffuser performance. Ejector testing was conducted using both an ejector wind tunnel.

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RANS-Based Noise Predictions of Jets with Internal Forced Mixers

The geometries of all five forced mixers evaluated in this study are shown in Figure 2. The 12-lobe mixers all have similar designs, with the primary difference being the lobe penetration height (H), which is defined in Figure 3. In addition to the 12-lobe mixers, both a scalloped and an unscalloped 20-lobe high penetration mixer were evaluated.

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