on the vorticity characteristics of lobeforced mixer at

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On the vorticity characteristics of lobe-forced mixer at ...

高达12%返现  Jan 25, 2009  Lobe-forced mixers are splitter plates with convoluted trailing edges designed to generate large-scale streamwise vorticity between two co-flowing streams. As typical passive vortex generators, their penetration

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On the vorticity characteristics of lobe-forced mixer at ...

On the vorticity characteristics of lobe-forced mixer at different configurations R. Mao Æ S. C. M. Yu Æ T. Zhou Æ L. P. Chua Received: 22 January 2008/Revised: 24 December 2008/Accepted: 31 December 2008/Published online: 25 January 2009 Springer-Verlag 2009 Abstract Lobe-forced mixer is one typical example of

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On the vorticity characteristics of lobe-forced mixer at ...

Jun 01, 2009  The geometrical configuration of the lobe significantly affects these two types of vortices, which in turn affects the mixing performance of the mixer. In the present investigation, characteristics of mixers with five different configurations were examined and evaluated for two velocity ratios ( r = 1, 0.4).

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On the vorticity characteristics of lobe-forced mixer at ...

Abstract Lobe-forced mixer is one typical example of the passive flow controllers owing to its corrugated trailing edge. Besides the spanwise Kelvin–Helmholtz vortex

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On the vorticity characteristics of lobe-forced mixer at ...

On the vorticity characteristics of lobe-forced mixer at different configurations. Author. mao, R. Yu, S.C.M. Zhou, T. Chua, L.P. Faculty. Civil Engineering and Geosciences. Date. 2009-01-25. Abstract. Lobe-forced mixer is one typical example of the passive flow controllers owing to its corrugated trailing edge.

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On the vorticity characteristics of lobe-forced mixer at ...

Jan 25, 2009  Lobe-forced mixer is one typical example of the passive flow controllers owing to its corrugated trailing edge. Besides the spanwise Kelvin–Helmholtz vortex shedding, streamwise vortices are also generated within its mixing layer. The geometrical configuration of the lobe significantly affects these two types of vortices, which in turn affects the mixing performance of

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On the vorticity characteristics of lobe-forced mixer at ...

Jan 25, 2009  Title: On the vorticity characteristics of lobe-forced mixer at different configurations: Published in: Experiments in Fluids, 46 (6). ISSN 1432-1114.

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On the vorticity characteristics of lobe-forced mixer at ...

On the vorticity characteristics of lobe-forced mixer at ...

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Nozzle exit flow profile shaping for jet noise reduction ...

On the vorticity characteristics of lobe-forced mixer at different configurations 25 January 2009 Experiments in Fluids, Vol. 46, No. 6 Dual stream axisymmetric mixing

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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.

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On the vorticity characteristics of lobe-forced mixer at ...

Jan 25, 2009  Title: On the vorticity characteristics of lobe-forced mixer at different configurations: Published in: Experiments in Fluids, 46 (6). ISSN 1432-1114.

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Some flow characteristics of lobed forced mixers at higher ...

The flow characteristics of two types of lobed forced mixers, the unscalloped and the scalloped mixers, have been examined at velocity ratios higher than unity, in relation to the variation of mass flux uniformity, the decay of the streamwise vorticity, the variation of turbulent kinetic energy and the growth of the shear layer with distance from the trailing edge. Three

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

Feb 16, 2015  Experimental studies of mixing flows with streamwise vorticity. M. S. Thesis, Massachusetts Institute of Technology, USA, 1991. Google Scholar. 16. ... On the vorticity characteristics of lobe-forced mixer at different configurations. Experiment Fluid 2009; 46: ...

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

May 17, 2012  On the vorticity characteristics of lobe-forced mixer at different configurations 25 January 2009 Experiments in Fluids, Vol. 46, No. 6 Experimental investigation of the mixing performance of a lobed jet flow

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Nozzle exit flow profile shaping for jet noise reduction ...

On the vorticity characteristics of lobe-forced mixer at different configurations 25 January 2009 Experiments in Fluids, Vol. 46, No. 6 Dual stream

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Experimental and numerical study of mixing characteristics ...

In a continuing effort to study the mixing enhancement by streamwise vorticity, time-average velocity measurements of turbulent, confined, coaxial nozzle

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Effects of Scalloping on the Mixing Mechanisms of Forced ...

Effects of Initial Boundary Layer Thickness to the Lobed Forced Mixer Trailing Streamwise Vorticity,” J. Propul. Power, 12, pp. ... On the Vorticity Characteristics of Lobe-Forced Mixer at Different Configurations,” Exp. Fluids, 46, pp.

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波瓣强迫混合器掺混及燃烧模型实验 - nuaa.cn

Abstract: Aimming at a two-dimensional lobed forced mixer with an internal central cone, a series of model experiments are performed to investigate the mixing and combustion performance on an experi-metal setup simulating the afterburner, and the experimental results are compared with that of a conventional mixer.The results show that the lobed forced mixer makes the distribution of

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Kelvin - Helmholtz and Streamwise Vortices in the Near ...

Apr 01, 2006  Abstract. In the present experimental investigation, the characteristics of two types of vortices, namely the normal Kelvin-Helmholtz (K-H) and streamwise vortices, generated in the near wake of a lobed forced mixer were examined and evaluated at two velocity ratios (r = U 1:U 2 = 1:1 and 0.4:1). The lobed forced mixer has only one lobe and was designed to

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Turbofan Forced Mixer Lobe Flow Modeling - NASA

implement several computer programs suitable for the design of lobe forced mixer nozzles. The analyses are based on linear or small disturbance formulations. The analyses were applied to several mixer lobe shapes to predict the downstream vorticity generated by different lobe shapes. Data was taken in a simplified planar mixer

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Two-stream mixing flow with streamwise vorticity - CORE

The aerodynamic characteristics of the single-lobe forced mixer have been extensively examined in the present dissertation. Nine single-lobe models with different parameters and geometry configurations were designed and fabricated. Penetration angles, lobe wavelengths, trailing edge configurations and modifications vary from case to case.

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[PDF] Streamwise vorticity enhanced compressible mixing ...

Jul 10, 1995  DOI: 10.2514/6.1995-2746 Corpus ID: 109329683. Streamwise vorticity enhanced compressible mixing downstream of lobed mixers @inproceedings{Tew1995StreamwiseVE, title={Streamwise vorticity enhanced compressible mixing downstream of lobed mixers}, author={D. Tew}, year={1995} }

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S.C.M.Yu - Google Scholar

Mixing characteristics of forced mixers with scalloped lobes. SCM Yu, TH Yip, CY Liu. Journal of propulsion and power 13 (2), 305-311, 1997. 44: ... On the vorticity characteristics of lobe-forced mixer at different configurations. R Mao, SCM Yu, T Zhou, LP Chua. Experiments in fluids 46 (6), 1049-1066, 2009. 42:

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Numerical investigation of lobe spacing ratio on ...

Nov 01, 2011  Geometric models of a lobed mixer nozzle with variation of lobe spacing ratios are created and the corresponding flow fields are simulated using a steady Reynolds Averaged Navier–Stokes (RANS) equation with a realizable k‐ϵ turbulence model and standard wall function. According to the numerical simulation results, the spacing ratio has a large influence

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On the vorticity characteristics of lobe-forced mixer at ...

In the present investigation, characteristics of mixers with five different configurations were examined and evaluated for two velocity ratios (r = 1, 0.4). The mixers have only one lobe in order to eliminate any possible interactions between neighboring vortices

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On the vorticity characteristics of lobe-forced mixer at ...

On the vorticity characteristics of lobe-forced mixer at ...

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Turbofan Forced Mixer Lobe Flow Modeling - NASA

implement several computer programs suitable for the design of lobe forced mixer nozzles. The analyses are based on linear or small disturbance formulations. The analyses were applied to several mixer lobe shapes to predict the downstream vorticity generated by different lobe shapes. Data was taken in a simplified planar mixer

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Turbofan Forced Mixer Lobe Flow Modeling i

Kutta condition at the trailing edge of the mixer. Once developed and calibrated, the same analysis was extended to handle periodic boundary conditions associated with typical engine forced mixers. The extended analysis was applied to several mixer lobe shapes to predict the downstream vorticity generated by different lobe shapes. Data was

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Some flow characteristics of lobed forced mixers at higher ...

The flow characteristics of two types of lobed forced mixers, the unscalloped and the scalloped mixers, have been examined at velocity ratios higher than unity, in relation to the variation of mass flux uniformity, the decay of the streamwise vorticity, the variation of turbulent kinetic energy and the growth of the shear layer with distance from the trailing edge. Three

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[PDF] Streamwise vorticity enhanced compressible mixing ...

Jul 10, 1995  DOI: 10.2514/6.1995-2746 Corpus ID: 109329683. Streamwise vorticity enhanced compressible mixing downstream of lobed mixers @inproceedings{Tew1995StreamwiseVE, title={Streamwise vorticity enhanced compressible mixing downstream of lobed mixers}, author={D. Tew}, year={1995} }

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Measurements of velocities in the near field of a lobed ...

Measurements of velocities in the near field of a lobed forced mixer trailing edge - Volume 101 Issue 1003

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波瓣强迫混合器掺混及燃烧模型实验 - nuaa.cn

Abstract: Aimming at a two-dimensional lobed forced mixer with an internal central cone, a series of model experiments are performed to investigate the mixing and combustion performance on an experi-metal setup simulating the afterburner, and the experimental results are compared with that of a conventional mixer.The results show that the lobed forced mixer makes the distribution of

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Experimental Measurement of the Vortex Development ...

Mar 18, 2015  An experimental study was conducted to investigate the mixing processes downstream of a forced mixer. A forced mixer generates large scale, axial (stirring) vorticity which causes the primary and secondary flow to mix rapidly with low loss. These devices have been successfully used in the past where enhanced mixing of two streams was a requirement.

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直升机热管理与红外辐射特性耦合分析方法

关键词: 直升机, 热管理, 温度分布, 红外辐射, 优化分析 Abstract: Future high-performance helicopters will face critical challenges in improving energy utilization and suppressing infrared radiation characteristics.To solve these two problems cooperatively, it is necessary to explore the coupling mechanism of thermal management and infrared radiation characteristics and ...

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Velocity characteristics of coaxial nozzle flows with a ...

Measurements have been conducted downstream of a two-dimensional lobed forced mixer in a wind tunnel and downstream of coaxial nozzles with and without a central three-dimensional lobed mixer in a water tunnel. In the wind tunnel experiment, a two-dimensional lobed mixer with six full lobes was tested at different velocity ratios.

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Flow structures of a lobed mixer and effects of streamwise ...

Jun 25, 2019  The authors would like to express their thanks for support from the National Natural Science Foundation of China (Grant Nos. 11572346, 11472305, 91541101, and 11522222) and Hunan Provincial Innovation Foundation for

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Lobed grilles for high mixing ventilation – An ...

Mar 01, 2011  The maximum velocity, U 0m, at the exit plane has a value of 3.8 m/s for both flows.Both grilles (innovative and commercial) are 33 mm height (H) and 200 mm width (L).For the commercial grille, the spacing between two straight ailerons, h, is 6.6 mm.For the innovative grille, the spacing between the lip edges of two ailerons varies because of the undulations shape

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Progress in helicopter infrared signature suppression ...

Abstract Due to their low-attitude and relatively low-speed fight profiles, helicopters are subjected to serious threats from radio, infrared (IR), visual, and aural detection and tracking. Among these threats, infrared detection and tracking are regarded as more crucial for the survivability of helicopters. In order to meet the requirements of infrared stealth, several different types of ...

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