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forced mixer lobes in ejector designs

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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Buy Exquisite electric cement mixer parts At Awesome ...

Beater Ejector Button Cordless Bowl-Lift Design. Warranty. 1 Year. Structure. HAND HELD Stand / Table. Certification. ... Electric cement mixer 500L double-shaft convenient transportation forced concrete mixer. US $5000-$6000 ... 1.multiple mixer 2.novel design 3.large capacity 4.light weight 5.easy to install and transport 6.convenient ...

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US4302934A - Lobed mixer/inverter - Google Patents

US4302934A US06/090,185 US9018579A US4302934A US 4302934 A US4302934 A US 4302934A US 9018579 A US9018579 A US 9018579A US 4302934 A US4302934 A US 4302934A Authority US United States Prior art keywords lobe fan outward extending radially outward lobes Prior art date 1979-11-01 Legal status (The legal status is an assumption and is not a legal conclusion.

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Fixed geometry mixer/ejector suppression system for ...

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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Scarfing and Scalloping Effects on Lobed Forced Mixer at Low ...

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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NTRS - NASA Technical Reports Server

Forced mixer lobes in ejector designs. Document ID. 19880058995. Document Type. Reprint (Version printed in journal). Authors. Presz, Walter M., Jr.(United ...

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Investigation on lobed nozzle mixer-ejector infrared ...

Investigation on lobed nozzle mixer-ejector infrared suppressor for helicopter exhaust ... Flow separation control of lobed ejector/forced mixer by ventilation.

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Experimental studies on supersonic mixer-ejector using ...

Presz WM (Jr); Gousy R; Morin BL (1986) Forced mixer lobes in ejector designs. AIAA Paper 86-1614 AIAA Paper 86-1614 Tillman TC; Patrick WP; Paterson RW (1991) Enhanced mixing supersonic jets.

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Inventions | Free Full-Text | Current Advances in Ejector ...

Alternative ejector designs seeking to improve performance were proposed. ... comparison to a circular section CPM ejector, was shown to increase by up to 43.5%. There was a total perimeter of the lobes, beyond which there are frictional losses along the wall surfaces, dominated the process and the recovered pressure reduced back to the ...

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Fluid Vortices - Page 531 - Google Books Result

B. 1986 Forced mixer lobes in ejector designs . AIAA Paper 86-1614 . Qiu , Y. J. 1992 A Study of streamwise vortex enhanced mixing in lobed mixer devices . Beverley Green · 1995 · ‎Technology & Engineering

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Characteristics of Ejectors on Small Gas Turbine ... - DGLR

Small jet engine designs may include a fan, an aft-fan, a geared fan or an ejector. Ejector design has the advantage of low weight and simplicity. ... reduced with forced mixing techniques to reduce drag during ... mixer lobes in ejector designs.

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web.mit.edu

Fig. 15 Scalar fields 2Å downstream of 15-deg forced mixers at four different lobe height-to-wavelength ratios (ô'vel = 0.10 and E* = 0.25). h* = a) 0.5, b) 1.25, c) 2.00, and d) 2.75. were again of a square lobe design; hence, the vorticity dis- tribution was assumed constant along the vertical side walls of the mixer. Two analyses were ...

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Hubbard Aviation Technologies QS3 Hushkit

Innovation. Three Components, One Efficient System The QS3 Hushkit system consists of three major components – an alternating-lobe exhaust nozzle, a fuselage-mounted acoustically-lined ejector, and a cascade-style thrust reverser – that work together to deliver maximum noise absorption while maintaining superior engine performance.

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Mixing and combustion augmentation of the RBCC with ...

The results show that the lobed mixer and rectangle mixer retain the best mixing combustion augmentation characteristics, and the triangle is the worst. Besides, with the number of lobes decreases, the larger scale vortex structure is induced downstream the mixers. It improves the combustion performance by enhancing the penetration depth.

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NASA-TR-111921 CEAS d,4 4.4-

in the lobed mixer of Presz [3], counter-rotating axial vorticity generated by mixer lobes is used to mix high speed engine primary core and fan stream flow with entrained lower speed secondary flow from an ejector inlet. The enhanced mixing is used to both increase the level of …

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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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Computational Analysis of the Flowfield of a Mixer-Ejector ...

At high area ratios, a freestream flow directly passes through the mixing duct ... 'Forced Mixer Lobes in Ejector Designs,' Journal of Propulsion andPower, Vo1.4, ...

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Supersonic nozzle mixer ejector | Journal of Propulsion and Power

May 23, 2012 · Assessment of Mixer-Ejector Nozzle with Thermal Acoustic Shield for Jet Noise Reduction. Jonathan M. Burt, ... Forced mixer lobes in ejector designs. W. PRESZ, JR.

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Forced mixer lobes in ejector designs | Joint Propulsion ...

Forced mixer lobes in ejector designs. W. PRESZ, JR. and; B. MORIN. W. PRESZ, JR. Western New England College, Springfield, MA. Search for more papers ...

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(PDF) A new conception of diffusion grilles for improved ...

Forced mixer lobes in ejector designs. Conference Paper. Jun 1986 ... The mixing processes downstream from a 'forced mixer' generating large-scale axial vorticity that causes primary and secondary ...

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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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Experimental Measurement of the Vortex Development ...

sensitivity to design variables has not been documented. An experiment ... lobe shape on forced mixer performance in low pressure ratio ejector systems. This is ...

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Laser Techniques for Fluid Mechanics: Selected Papers from ...

... of a Lobed Forced Mixer", Journal of Engineering for Gas Turbine and Power, ... B., (1986), "Forced Mixer Lobes in Ejector Designs", AIAA 86-1614 Presz, ... R.J. Adrian, ‎Diamantino Durao, ‎M.V. Heitor · 2002 · ‎Technology & Engineering

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Flow-Field of a 12-Lobe Convoluted Mixer - International ...

Keywords: axisymmetric lobed mixer, confined flow, fuel/air mixing. Abstract. The flow-field ... research subject aiming at design optimisation of lobed mixers or ejectors to improve engine ... Development Downstream of a Lobed Forced Mixer,.

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Performance Simulation of an ideal mixer-ejector turbofan ...

The mixer-ejector engine consists of a low-bypass ratio mixed flow turbofan coupled to an exhaust mixer ejector configuration (ejector doors and forced mixer) followed by a condi-nozzle (Fig. 1). NLR’s Flight Physics Department (AVFP, Laban) did exploratory CFD design calculations with an Euler code to capture the main flow physics of the ...

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Vortices in Aero-Propulsion Systems | SpringerLink

B. 1986 Forced mixer lobes in ejector designs. AIAA Paper 86-1614. Google Scholar. Qiu, Y. J. 1992 A Study of streamwise vortex enhanced mixing in lobed mixer devices. Ph. D. Thesis, Massachusetts Institute of Technology. Google Scholar. Raines, D. A. 1954 Tip clearance flows in axial flow compressors and pumps.

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Progress in helicopter infrared signature suppression ...

Apr 01, 2014 · 4.3. Parameters on mixer-ejector performances. The use of lobed mixers in short efficient systems was firstly presented by Presz et al. 19 They conducted an experimental study to investigate the benefits of using forced mixer lobes in low-pressure ratio, ejector/diffuser systems. Their results showed over a 100% increase in both pumping and ...

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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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Forced mixer lobes in ejector designs | Semantic Scholar

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

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

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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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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Journal of Infrared and Millimeter Waves

Mar 1, 2004 — The results show that (1) Ambient air pumping-mixing plays a dual role for ... Gousy R G, Morin B L. Forced mixer lobes in ejector designs [R].

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DESIGN, FABRICATION, AND DEMONSTRATION OF A MEMS STEAM ...

Abstract: The design, fabrication, and successful demonstration of a microfabricated steam generator based on the homogeneous catalytic decomposition of hydrogen peroxide are presented. The device consists of a mixer, a reactor, and a nozzle, and it produces a jet of high-speed steam that can be used for driving ejector pumps and microthrusters.

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Velocity and Turbulence Characteristics of Isothermal ...

The calculations of the lobe and mixing duct flows were coupled to predict the complete mixer. Comparisons between measurements and calculations using a standard k-ε model suggested good qualitative agreement with maximum disagreement of about 20 percent in peak radial velocities. ... Forced Mixer Lobes in Ejector Designs,"

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Performance improvement of propulsion systems by optimization ...

the forced mixer for cold fan and core flow is to the one of the annular mixer the lower the loss is. As can be seen the 18 lobe mixer has a significantly higher thrust and thus lower loss than the datum 16 lobe mixer whereas the 20 lobe mixer is close to the 16 lobe mixer. The mixing efficiency is in simple terms the diffe-rence in hot and ...

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