Experimental studies on mixing of two co-axial high-speed streams

Narayanan, Anil K.; Damodaran, K. A.

doi:10.2514/3.23712

Cited by 17 publications

(3 citation statements)

References 9 publications

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“…Recent interest in lobed mixers has extended their use from mixing two flow streams to mixing fuel and oxidant streams in combustion systems, thus eliminating the central body. This geometry has recently been studied for ejectors ] and for supersonic coaxial streams [Narayanan and Damodaran, 1994]. The geometry and flow system is still expected to be unique to the present study because both flows will be subsonic and the secondary flow is an actual flow, not induced by entrainment as in an ejector.…”

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Mixing Processes in a Coaxial Geometry with a Central Lobed Mixer-Nozzle

Belovich

Samimy

1997

AIAA Journal

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has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer.The quality of this reproduction is dependent upon the quality of the copy subm itted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.

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Mixing Processes in a Coaxial Geometry with a Central Lobed Mixer-Nozzle

Belovich

Samimy

1997

AIAA Journal

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“…Venturimeters are provided on these lines for measurement of secondary mass flow rate. More details of the setup are in the earlier work of Narayanan (1993).…”

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Experimental studies on supersonic mixer-ejector using radially lobed nozzles

Rajamanohar

Damodaran

Kurian

1994

Experiments in Fluids

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IntroductionDue to a variety of advantages like thrust augmentation, reduction of jet noise and plume radiation, ejectors are used in numerous aerospace applications. Considerable research effort has been made, of late, towards attaining the best possible ejector configuration. A mixer ejector which replaces the conventional circular ejectors and the associated long mixing ducts is considered a viable solution to a good ejector even in supersonic speeds. Details of work based on a mixer ejector are available in recent literature. [Tillman et al. (1991, 199z), Presz et al. (1986)]. Primary nozzles in these studies were two dimensional lobed (symmetric/unsymmetric) ones. Basically the mixer ejector concept centres around the generation of an array of large scale low intensity streamwise vortices into the mixing duct. These vortices enhance the mixing process by an inviscid stirring process [Werle et al. (1987)] and give rise to better ejector performance and shorter mixer lengths. What has been conclusively proved in previous works [Presz et al. 0986)] is that in mixer-ejector configuration, effectiveness of mixing depends strongly on lobe shape of the primary nozzle. In the recent past, Narayanan (2993) developed a radially lobed supersonic nozzle (petal nozzle) for the primary flow and tested it in the ejector mode. It has been found that petal nozzle gives very good pumping characteristics over conical nozzles and also over 2-D lobed nozzles. The present work aims at further investigations on the aspect of ejector performance of four different petal nozzles of different configurations. 2 Details of experimentsThe schematic of experimental setup used for this study is given in Fig. la. The primary line consists of settling chamber, contraction and the petal nozzle. To the settling chamber of secondary flow, which is annular and coaxial with the primary

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“…By measuring total pressure, temperature, and velocity, they concluded that mixing was enhanced. Narayanan and Damodaran [1994] studied supersonic coaxial jets with the lobed mixer as the central jet, for both confined and unconfined flow. They used a convergent-divergent nozzle that was circular up to the throat, then branched into six separate lobes.…”

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confidence: 99%