High mixing effectiveness lobed nozzles and mixing
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High mixing effectiveness lobed nozzles and mixing.

High mixing effectiveness lobed nozzles and mixing ...

10%  Jun 12, 2015  Thus, the mixing is improved in the middle and posterior segments. Compared to the lobed nozzle with a central plug, the improved sword alternating-lobe nozzle can achieve a higher mixing effectiveness with much less pressure loss, which is preferred in situations when the power loss of the engine is restricted.

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Configurations of lobed nozzles for high mixing effectiveness

Dec 01, 2015  Investigations have revealed that the normal lobed nozzle with a central plug enhances pumping performance and mixing effectiveness, but also induces large pressure loss. However, the mixing effectiveness of the existing alternating-lobe nozzle,,, is lower than that of a normal lobed nozzle with a central plug.

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High mixing effectiveness lobed nozzles and mixing ...

adshelp[at]cfa.harvard The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A

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Configurations of lobed nozzles for high mixing effectiveness

The circular lobed nozzle used in the infrared suppressors of helicopters and warships has a configuration that facilitates highly effective mixing of the jet. A sword alternating-lobe nozzle and two types of spoilers (installed at the lobe peaks to improve the mixing) were introduced.

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Jet mixing of lobed nozzles with spoilers located at lobe ...

Jun 05, 2017  For the nail-like peaks, the thermal mixing efficiency also increases with α in this mixing segment. The thermal mixing efficiency from 1.5 d to 2.5 d for the different lobed nozzles

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Jet mixing of lobed nozzles with spoilers located at lobe ...

Numerical investigation of the jet mixing of a sword alternating-lobe nozzle with lobed and nail-like spoilers located at the lobe peaks was conducted to analyse the effect of different lobe peak spoilers on the pumping ratio, mixing effectiveness, and total pressure recovery coefficient.

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Chevron spoiler to improve the performance of lobed ...

Oct 01, 2016  An ejector/mixer assembled using a lobed nozzle and a mixing duct is the fundamental model of an infrared suppressor. The purposes of a lobed nozzle are to achieve a high pumping ratio, high mixing effectiveness, and high total pressure recovery coefficient,,,,.

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US6877960B1 - Lobed convergent/divergent supersonic nozzle ...

Because the lobed primary nozzle mixes the primary and secondary flows, an inner shroud wall boundary layer is energized, and any ejector shroud diffuser

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Vortical and turbulent structure of a lobed mixer free ...

May 17, 2012  High mixing effectiveness lobed nozzles and mixing mechanisms 12 June 2015 Science China Technological Sciences, Vol. 58, No. 7 Experimental and numerical study of mixing characteristics of a rectangular lobed mixer in supersonic flow

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Mixing Process in a Lobed Jet Flow

the maximum effectiveness region for the lobed nozzle to enhance mixing is about the ” rst two diameters of the lobed nozzle(” rst six lobe heights). Nomenclature D = diameter of the lobed nozzle, 40 mm H = lobe height, 15 mm K = turbulent kinetic energy,.1=2U2 0/.u 02Cv02Cw02/ KN.z/ = averaged-turbulent kinetic enegy, R ½W.x;y;z/K.x;y;z ...

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Jet mixing of lobed nozzles with spoilers located at lobe ...

Numerical investigation of the jet mixing of a sword alternating-lobe nozzle with lobed and nail-like spoilers located at the lobe peaks was conducted to analyse the effect of different lobe peak spoilers on the pumping ratio, mixing effectiveness, and total pressure recovery coefficient.

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Mixing effectiveness test of an exhaust gas mixer in a ...

Thermal mixing effectiveness characteristics of an eighteen lobe, scalloped and unscalloped, partial, forced mixer were measured in a high-bypass turbofan engine. Data were also obtained without the mixer installed, i.e. free mixing. Tests were conducted at four combinations of simulated flight conditions from 0.3 to 0.8 Mach number and from 6,096 meters (20,000 ft) to 13,715 m (45,000 ft ...

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(PDF) Numerical Simulation of Effect of Lobed Nozzle on ...

Lobed nozzle diffuses at a higher (1982) revealed on the basis of various measurements, the rate than that of circular nozzle. Design optimization of the lobed existence of large scale stream-wise vortices in mixing of co- nozzle would lead to higher rates of efficient temperature mixing. flows in lobed nozzle.

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Passive Mixing Control via Lobed Injectors in High-Speed Flow

Passive Mixing Control via Lobed Injectors in High-Speed Flow A. J. Majamaki,¤O.I.Smith,†and A. R. Karagozian‡ University of California, Los Angeles, Los Angeles, California 90095-1597 The near-” eld ‘ ow and mixing characteristics of nonreactive lobed fuel injectors in subsonic and transonic airstreams were studied experimentally.

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[PDF] A study on a lobed jet mixing flow by using ...

In a continuing effort to study the mixing enhancement by large-scale streamwise vortices generated by a lobed nozzle, a high-resolution stereoscopic particle image velocimetry (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. The three-dimensional instantaneous and ensemble ...

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Dual stream axisymmetric mixing in the presence of axial ...

An experimental investigation was undertaken to study mixing in a coaxial jet where the inner nozzle is a lobed mixer. Four inner jet nozzle geometries were explored: a baseline circular jet and three different six-lobed nozzles. Also, three velocity ratios of 3:1, 1:1,

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Mixing Processes in a Coaxial Geometry with a Central ...

May 17, 2012  High mixing effectiveness lobed nozzles and mixing mechanisms 12 June 2015 Science China Technological Sciences, Vol. 58, No. 7 Numerical Predictions of Scarfing on Performance of S-Shaped Nozzle with Asymmetric Lobe

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US6877960B1 - Lobed convergent/divergent supersonic nozzle ...

An ejector system comprises a lobed, supersonic primary nozzle and a convergent/divergent ejector shroud. The lobed nozzle is just upstream from the ejector shroud, such that there is an annular space between the nozzle and shroud for admitting a secondary flow. In operation, a primary flow of high-pressure steam or air is directed through the primary nozzle, where it is accelerated to ...

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Noise Reduction With Lobed Mixers: Nozzle-Length and Free ...

given nozzle length the two flows need to be mixed "sufficiently" rapidly inside the nozzle. This can raise its high-frequency noise content, which crucially influences the perceived noise level (PNL) and may be acoustically penalizing at take-off conditions. The rate of mixing inside the nozzle depends primarily on the lobe mixer geometry. The ...

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Mixing effectiveness test of an exhaust gas mixer in a ...

Thermal mixing effectiveness characteristics of an eighteen lobe, scalloped and unscalloped, partial, forced mixer were measured in a high-bypass turbofan engine. Data were also obtained without the mixer installed, i.e. free mixing. Tests were conducted at four combinations of simulated flight conditions from 0.3 to 0.8 Mach number and from 6,096 meters (20,000 ft) to 13,715 m (45,000 ft ...

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

the proposed reason why a lobed nozzle would enhance both large-scale mixing and small-scale mixing reported by other researchers. The overall effect of the lobed nozzle on the mixing process in the lobed jet mixing flow was evaluated by analyzing

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An experimental study of the effects of lobed nozzles on ...

Nov 11, 2019  Abstract Jet noise remains a significant aircraft noise contributor, and for modern high-bypass-ratio aero-engines the strong interaction between the jet and aircraft wing leads to intensified installed jet noise. An experiment is carried out in this paper to study the effects of lobed nozzles on installed jet noise. It is found that the lobed nozzles, compared to round nozzles, have similar ...

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Passive Mixing Control via Lobed Injectors in High-Speed Flow

Passive Mixing Control via Lobed Injectors in High-Speed Flow A. J. Majamaki,¤O.I.Smith,†and A. R. Karagozian‡ University of California, Los Angeles, Los Angeles, California 90095-1597 The near-” eld ‘ ow and mixing characteristics of nonreactive lobed fuel injectors in subsonic and transonic airstreams were studied experimentally.

Get Price

Mixing Processes in a Coaxial Geometry with a Central ...

High mixing effectiveness lobed nozzles and mixing mechanisms 12 June 2015 Science China Technological Sciences, Vol. 58, No. 7 Numerical Predictions of Scarfing on Performance of S-Shaped Nozzle with Asymmetric Lobe

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Stereoscopic PIV Measurement of a Lobed Jet Mixing Flow

The overall effect of the lobed nozzle on the mixing process in the lobed jet mixing flow ... the mixing process of the high temperature and high-speed gas plume from air-engine with ambient cold air (Power et ... on mixing effectiveness as long as the flow dose not separated (Presz et al. 1986). Paterson (1982) is considered to be the first ...

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Investigation of mixing in a turbofan exhaust duct. II ...

May 17, 2012  High mixing effectiveness lobed nozzles and mixing mechanisms 12 June 2015 Science China Technological Sciences, Vol. 58, No. 7 Numerical research on the mixing mechanism of lobed mixer with inlet swirl in linear radial distribution

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

All these four rectangular lobed nozzles have the same exit area (6400mm2, equivalent diameter is about 90 mm). Rectangular lobed nozzle A has an aspect ratio (AR) of 1.0, while the aspect ratios (AR) of lobed nozzle B, lobed C and lobed D are same, which is 1.2. The three mixing tubes used in the present study are

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The Effects of Scalloping Width and Position on Jet Mixing ...

The Effects of Scalloping Width and Position on Jet Mixing of Lobed Nozzles. Liu DaWei 1 Huang Jun 1 Sheng Zhiqiang 1 Ji Jinzu 1 1 Beijing University of Aeronautics and Astronautics - School of Aeronautic Science and Engineering - Beijing - China. ...

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Vortical and turbulent structure of a lobed mixer free ...

May 17, 2012  High mixing effectiveness lobed nozzles and mixing mechanisms 12 June 2015 Science China Technological Sciences, Vol. 58, No. 7 Experimental and numerical study of mixing characteristics of a rectangular lobed mixer in supersonic flow

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Mixing Characteristics of Forced Mixers with Scalloped ...

High mixing effectiveness lobed nozzles and mixing mechanisms 12 June 2015 Science China Technological Sciences, Vol. 58, No. 7 Numerical Predictions of Scarfing on Performance of S-Shaped Nozzle with Asymmetric Lobe

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An experimental study of the effects of lobed nozzles on ...

Jet noise remains a significant aircraft noise contributor, and for modern high-bypass-ratio aero-engines the strong interaction between the jet and aircraft wing leads to intensified installed jet noise. An experiment is carried out in this paper to study the effects of lobed nozzles on installed jet noise. It is found that the lobed nozzles, compared to round nozzles, have similar effects on ...

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[PDF] Mixing Processes in a Coaxial Geometry with a ...

An experimental investigation was undertaken to study mixing processes in a coaxial jet, where the inner jet geometry is a lobed mixer. Various inner jet nozzle geometries were explored at three velocity ratios (3:1, 1:1, and 1:3, inner:outer). Detailed flow visualizations were performed and have been reported elsewhere. Results of velocity measurements of one of the nozzles that generates ...

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