The scholarships are used to allow air movement for high efficiency and low noise in the power range of applications in the home to investigate. The projects include a study of the unsteady fluid dynamics, flow instability and acoustic and every experience and a template. This is a unique opportunity, a real design challenge with a leading company in the original research to do justice to a broader effect on the acoustic emissions in many other 1kW air machine in motion.
The studentships are to commence in October 2011.
Project 1: Towards a Silent Fan
The Dyson Air Multiplier’s striking design offers many advantages in operation: the airflow it generates is free of the turbulence associated with conventional fans; it is efficient, easy to clean and as quiet as other fans. The aim of this project is to take the design even further and create the ultimate low-noise fan while staying within a strict design envelope. The cooling airflow involves no moving blades and is at a low enough speed that the noise from this flow is not significant. This means that the focus of the project will be on novel, quiet internal flow components. Components of interest will be: the impeller blades that produce tonal noise, which is enhanced by interactions with the inlet and outlet geometry; and sections of the flow path with abrupt curvature that can cause local separations, wakes and noise. In this project we will develop simplified models to predict noise generated from the individual components (impeller, guide vanes, air jet, etc) and their interaction and integrate these ideas to develop design rules for reducing noise. The project aims to determine the lowest noise level that can be achieved for a fan with given air flow-rate, air speed and efficiency, and to develop design concepts that can achieve it.
Project 2: Aeroacoustics of Cyclone Separators
Cyclones are complex three-dimensional flows that swirl about a central column of fluid inline with the axis of rotation. The column consists of a solid-body rotation that at low flow speeds do not show large instabilities. However as the flow speed increases, the vortex core deforms into a rotating spiral and begins to precess around the central axis. The instability leads to a temporally periodic motion that results in a tonal noise. It is suspected that the frequency of the processing vortex core has a relationship with the frequency of the observed sound.
The main objectives of the project are to develop a model for the precessing vortex core and to discover ways of controlling noise either by suppressing the periodic flow instability passively, actively or by applying anti-sound control¬The challenge is to stabilise the flow or reduce the noise without introducing a loss in performance either in the form of pressure drop or particle separation.
The solution could have a wide range of applicability from vacuum cleaners to helicopter intakes and Ranque-Hilsch vortex tubes used for refrigeration.
Eligibility
The application is open to nationals of any country, but the fees are not from foreign (non EU) students. Allocations for 2010-2011 are £ 13,290, and for 3 years. Applicants must hold a bachelor's degree in aeronautics and space engineering, mechanical engineering or acoustic, physics or related fields.
Scholarship Application Deadline: 6 May 2011
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