Initial optimisation of a fluidically controlled variable swirl fuel injector

Brundish, K. D.; Wilson, Channing W.; Tippetts, J. R.; Woolhouse, Robert

doi:10.2514/6.1999-2403

Cited by 2 publications

(2 citation statements)

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“…The required device performance was then calculated theoretically using a FORTRAN 77 program, giving a required eVective area turndown ratio of approximately 2:6 : 1 (full load/idle condition) for an AFR range of between 30 and 140 (load and idle). This value lies in the predicted range [14,15] of between 2 and 5. Thus, the TuVA area turn-up must ideally exceed the predicted 2.6 to allow for model inaccuracies and future engine development.…”

Section: Features Specific To This Studymentioning

confidence: 58%

A comparison of the experimental and computational modelling of the fluidic turn-up vortex amplifier at full and zero swirl conditions

Woolhouse

Tippetts

Beck

2001

Proceedings of the Institution of Mechanical Engineers, Part C:

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The design and operation of a novel type of fluidic vortex amplifier have been investigated experimentally using model tests with ambient air, and using computationally time-dependent computational fluid dynamics (CFD) simulation. The ultimate objective is to develop a no-moving-part variable air distribution device for implementation within gas turbine combustors using the fuel flow as the controlling agent. Although both liquid and gaseous fuels are ultimate goals of this device, this paper describes the first stage of the work involving operation with nominally uniform density fluid (air). There is some discrepancy between the simulation and test data, but design and performance trends were usefully simulated. An important feature of the CFD was the occurrence of a weak time dependent flow structure, particularly with the Reynolds stress model (RSM). Flow modulation within the desired range (4.5 compared with 2.6) was demonstrated, and these are shown, along with some general points concerning computational modelling convergence and turbulence models.

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Section: Features Specific To This Studymentioning

confidence: 58%

A comparison of the experimental and computational modelling of the fluidic turn-up vortex amplifier at full and zero swirl conditions

Woolhouse

Tippetts

Beck

2001

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…; outflow to control flow ratio. Brundish 7 , et al, used a diverter for a variable swirl fuel injector and use CFD to predict the control flow to effect switching. Czech and Anderson 8 propose an interesting concept for noise cancellation by acoustically coupling ambient noise to the diverter control input to produce an amplified output 180 degrees out of phase.…”

Section: Variable Frequency Fluidic Diverter Actuator Design Conceptmentioning

confidence: 99%

Variable Frequency Diverter Actuation for Flow Control

Culley

2006

3rd AIAA Flow Control Conference

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• E-mail your question via the Internet to help@sti.nasa.gov• Fax your question to the NASA STI Help Desk at 301-621-0134• This report contains preliminary findings, subject to revision as analysis proceeds.The design and development of an actively controlled fluidic actuator for flow control applications is explored. The basic device, with one input and two output channels, takes advantage of the Coanda effect to force a fluid jet to adhere to one of two axi-symmetric surfaces. The resultant flow is bi-stable, producing a constant flow from one output channel, until a disturbance force applied at the control point causes the flow to switch to the alternate output channel. By properly applying active control the output flows can be manipulated to provide a high degree of modulation over a wide and variable range of frequency and duty cycle. In this study the momentary operative force is applied by small, high speed isolation valves of which several different types are examined. The active fluidic diverter actuator is shown to work in several configurations including that in which the operator valves are referenced to atmosphere as well as to a source common with the power stream. I. IntroductionFlow control, broadly defined, is the ability to purposely alter the characteristics of a flowfield in order to extract some overall benefit. More precisely in terms of present day aeronautics technology, flow control implies the intent to correct any local defects in a given flowfield which generally are the result of transitory, three-dimensional effects in a volatile design space. A fixed aeromechanical surface can only be expected to perform optimally over a relatively narrow range of conditions and flow control is viewed as a method in which to extend this useful range. Hence, flow control in aero vehicles and engines is a vigorous area of research. Still the implementation of flow control in actual practice is limited to well-understood and well-behaved techniques such as passive vortex generators and the mechanical articulation of flow surfaces. These passive attempts at flow control are effective and often necessary, however they ultimately limit performance.NASA Glenn Research Center (GRC) is aggressively pursuing new flow control methodologies and applications in future aero-vehicles. These are largely "active" flow control methodologies meaning that when not needed they are not applied. The intent is to minimize the performance penalty which would otherwise be incurred. In a paper by Lord 1 , et al, many opportunities for active flow control within turbomachinery are articulated. Presently, turbinebased propulsion systems require large aeromechanical design margins and make very limited use of scheduled flow control. The design of these systems is typically based on the worst-case requirements seen at take-off and landing and from the expected performance degradation resulting from routine wear during the service life of the engine. In a typical commercial aircraft, however, only during a small portion of the m...

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Initial optimisation of a fluidically controlled variable swirl fuel injector

Cited by 2 publications

References 0 publications

A comparison of the experimental and computational modelling of the fluidic turn-up vortex amplifier at full and zero swirl conditions

A comparison of the experimental and computational modelling of the fluidic turn-up vortex amplifier at full and zero swirl conditions

Variable Frequency Diverter Actuation for Flow Control

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