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Forced mixer lobes in ejector designs Journal of ...

May 23, 2012  Forced mixer lobes in ejector designs. ... Kelvin - Helmholtz and Streamwise Vortices in the Near Wake of a Single-Lobe Forced Mixer. 24 July 2006 Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, Vol. 220, No. 4 ... The Effect of Core Flow Turbulence on Planar Lobed-Mixer Nozzle Effectiveness.

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Forced mixer lobes in ejector designs - NASA Technical ...

Forced mixer lobes in ejector designs 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 generation of large scale axial vorticity in the mixing duct. The vorticity causes rapid mixing of the primary and secondary flows with low losses; since mixing ...

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Forced mixer lobes in ejector designs - CORE

Forced mixer lobes in ejector designs . By R. G. Gousy, Jr. W. M. Presz and B. L. Morin. Abstract. 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 generation of large scale axial vorticity in the ...

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Forced mixer lobes in ejector designs - NASA/ADS

Jun 01, 1986  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 generation of large scale axial vorticity in the mixing duct. The vorticity causes rapid mixing of the primary and secondary flows with low losses; since mixing length is minimized, wall friction losses ...

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Forced mixer lobes in ejector designs - NASA/ADS

Aug 01, 1988  Forced mixer lobes in ejector designs Presz, Walter M., Jr.; ... August 1988 Bibcode: 1988JPP.....4..350P Keywords: Ejectors; Jet Mixing Flow; Nozzle Design; Ducted Flow; Thrust Augmentation; Velocity Distribution; Vorticity; Wind Tunnel Tests; Fluid Mechanics and Heat Transfer; No

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Investigation on Incompressible Lobed Mixer–Ejector ...

A semi-empirical one-dimensional model is developed for the incompressible lobed mixer–ejector design and optimization analysis. This model is deduced on the conservation relations of mass, momentum, and energy by using the control volume method with consideration of the incomplete mixing in a short mixing duct and the pressure loss of the intake system.

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Short efficient ejector systems - CORE

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. Numerous mixer lobe variations were tested to develop lobe design guidelines. The improved performance of mixer-ejectors is presented over a range of operating ...

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Forced mixer lobes in ejector designs Joint Propulsion ...

American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20191-5807 703.264.7500

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Forced mixer lobes in ejector designs - NASA Technical ...

Forced mixer lobes in ejector designs. Document ID. 19880058995 . Document Type. Reprint (Version printed in journal) Authors. Presz, Walter M., Jr. (United Technologies Research Center East Hartford, CT; Western New England College, Springfield, MA, United States)

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Forced mixer lobes in ejector designs - NASA/ADS

Forced mixer lobes in ejector designs Presz, Walter M., Jr.; ... August 1988 Bibcode: 1988JPP.....4..350P Keywords: Ejectors; Jet Mixing Flow; Nozzle Design; Ducted Flow; Thrust Augmentation; Velocity Distribution; Vorticity; Wind Tunnel Tests; Fluid Mechanics and Heat Transfer; No

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Forced mixer lobes in ejector designs Journal of ...

Forced mixer lobes in ejector designs Author: PRESZ, WALTER M. MORIN, BRUCE KL. GOUSY, ROBERT G. Journal: Journal of Propulsion and Power Issue Date: 1988 Abstract(summary):

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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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The Effect of Core Flow Turbulence on Planar Lobed-Mixer ...

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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Alternating lobed mixer/ejector concept suppressor - Stage ...

Feb 04, 1998  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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Computational studies of lobed forced mixer flows ...

Full Navier-Stokes Analyses have been conducted for the flows behind the trailing edge of a lobed forced mixer. The governing equations are derived from the time-dependent compressible Navier-Stokes equations and discretized in the finite-difference form. A simple two-layer eddy viscosity model has also been used to account for the turbulence. Computed results are compared with some of the ...

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Computation and Validation of Parameter Effects on Lobed ...

Aug 01, 2005  Presz W M. Gousy R G, Morin B L. Forced mixer lobes in ejector designs[R]. AIAA Paper 86–1614, 1986. Google Scholar. 5 DeBonis J R. Full navier stokes analysis of a two-dimensional mixer/ejector nozzle for noise suppression[R]. AIAA Paper 92–3570, 1992. Google Scholar. 6

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A study on a lobed jet mixing flow by using stereoscopic ...

Oct 15, 2001  The averaged turbulent kinetic energy profile indicated that most of the intensive mixing between the core jet flow and ambient flow, due to the special geometry of the lobed nozzle, ... Presz, R. Gousy, and B. Morin, “Forced mixer lobes in ejector designs,” AIAA Paper No. 86-1614, 1986.

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Effects of Core Flow Swirl on the Flow Characteristics of ...

Sep 21, 2012  Measurements were made downstream of the mixer in a coaxial wind tunnel. The core-to-bypass velocity ratio was set to 2:1, temperature ratio to 1.0, and pressure ratio to 1.03, giving a Reynolds number of 5.2 × 10 5, based on the core flow velocity and equivalent diameter. In the core flow, the background turbulence intensity was raised to 5% ...

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Infrared signal of the lobed mixer with external air ...

May 06, 2021  The exhaust nozzle used in the experiment is a lobed mixer with a lobe of sinusoidal shape and is designed to have a penetration of 0.2. Exhaust gas temperature and infrared signal are measured according to distance from nozzle outlet under conditions of bypass ratio of 0.5, 1.0 and 1.4.

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Numerical research on the mixing mechanism of lobed mixer ...

Feb 16, 2015  The core-to-bypass temperature ratio and pressure ratio were set to 2.59 and 0.97, respectively, giving the Mach number of 0.66 and bypass ratio of 2.65 at mixing nozzle outlet. In the core inlet, the swirl angle was raised from 0° to 30° in a uniform or linear radial distribution manner.

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(PDF) Use of streamwise vorticity to increase mass ...

Abstract The following work documents the effect of streamwise vortices generated at the nozzle exit of an axisymmetric air jet on the amount of mass entrained into an ejector. In an experimental analysis of the mass entrainment of circular jet

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Computational Fluid Dynamics Analysis of Jets with ...

The results for one confluent mixer and three forced mixer geometries are presented in this paper. The confluent mixer geometry, shown in Figure 1, is an axisymmetric splitter plate which separates the bypass and core flows. All three forced mixers, which are essentially convoluted splitter plates, have 12 lobes and are of similar designs.

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Alternating lobed mixer/ejector concept suppressor - Stage ...

Feb 04, 1998  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 ...

Get Price

Computation and Validation of Parameter Effects on Lobed ...

Aug 01, 2005  Presz W M. Gousy R G, Morin B L. Forced mixer lobes in ejector designs[R]. AIAA Paper 86–1614, 1986. Google Scholar. 5 DeBonis J R. Full navier stokes analysis of a two-dimensional mixer/ejector nozzle for noise suppression[R]. AIAA Paper 92–3570, 1992. Google Scholar. 6

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Micro-Gas Turbine Engine Ejector-Mixer Design and Testing

the behavior of ejector-mixers at low Reynolds numbers, the existence of empirical data at such conditions would greatly aide in design of and ejector-mixer for use with the micro-gas turbine engine. 3 Objectives The primary objective of this project was to characterize the performance of ejector-mixers at low Reynolds numbers.

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Research on the Rectangular Lobed Exhaust Ejector /Mixer ...

May 19, 2015  From the comparison of ture and has the highest pumping coefficient among thethe exhaust ejector/mixer systems 6 and 7 (combina- tested exhaust ejector/mixer systems, also has the big-tions of C + III and D + Ill), it can be suggested that gest pressure loss coefficient.scalloping treatment of the lobe structure can improve 3.3.

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Infrared signal of the lobed mixer with external air ...

May 06, 2021  The exhaust nozzle used in the experiment is a lobed mixer with a lobe of sinusoidal shape and is designed to have a penetration of 0.2. Exhaust gas temperature and infrared signal are measured according to distance from nozzle outlet under conditions of bypass ratio of 0.5, 1.0 and 1.4.

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Numerical research on the mixing mechanism of lobed mixer ...

Feb 16, 2015  The core-to-bypass temperature ratio and pressure ratio were set to 2.59 and 0.97, respectively, giving the Mach number of 0.66 and bypass ratio of 2.65 at mixing nozzle outlet. In the core inlet, the swirl angle was raised from 0° to 30° in a uniform or linear radial distribution manner.

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Mixing enhancement in a lobed injector: Physics of Fluids ...

Jun 04, 1998  An experimental investigation of the non-reactive mixing processes associated with a lobed fuel injector in a coflowing air stream is presented. The lobed fuel injector is a device which generates streamwise vorticity, producing high strain rates which can enhance the mixing of reactants while delaying ignition in a controlled manner. The lobed injectors examined in the present study

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Two-stage mixer ejector suppressor - Stage III ...

Oct 11, 1996  The multi-stage mixer of claim 1 wherein the primary lobes end in the first mixer stage; and the secondary lobes end in the second mixer stage, at a trailing edge of the ejector shroud. 3. The multi-stage mixer of claim 1 wherein the primary ring of lobes guides ambient air into the ejector shroud and mixes the engine exhaust gasses with that ...

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(PDF) Experimental and Numerical Studies on Lobed Ejector ...

For the purpose of improving thrust and cooling the wall of the nozzle on a micro turbojet engine, the aerodynamic characteristics micro lobed ejector, which consists of a lobed nozzle and mixing, is studied using numerical calculations and

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A study on a lobed jet mixing flow by using stereoscopic ...

Oct 15, 2001  The averaged turbulent kinetic energy profile indicated that most of the intensive mixing between the core jet flow and ambient flow, due to the special geometry of the lobed nozzle, ... Presz, R. Gousy, and B. Morin, “Forced mixer lobes in ejector designs,” AIAA Paper No. 86-1614, 1986.

Get Price

Effects of Core Flow Swirl on the Flow Characteristics of ...

Sep 21, 2012  Measurements were made downstream of the mixer in a coaxial wind tunnel. The core-to-bypass velocity ratio was set to 2:1, temperature ratio to 1.0, and pressure ratio to 1.03, giving a Reynolds number of 5.2 × 10 5, based on the core flow velocity and equivalent diameter. In the core flow, the background turbulence intensity was raised to 5% ...

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Stereoscopic PIV measurement of a lobed jet mixing flow ...

Abstract. In a continuing effort to study the mixing enhancement by large scale streamwise vortices generated by a lobed nozzle, a high-resolution stereoscopic PIV system was used in the present study to conduct three-dimensional measurements of air jet flows exhausted from a lobed nozzle and a conventional circular nozzle.

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Aerothermodynamic benefits of mixed exhaust turbofans ...

The preference for mixed exhaust turbofan installations in corporate, regional, and in some commercial airliners is primarily because of the claimed improvement in thrust and Specific Fuel Consumption (SFC) with mixing. This improvement (2 to 3%) has been demonstrated in prior component tests of mixed exhaust configurations in powered wind tunnels.

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