Modelling, assessment, and reduction of unsteady pressure fluctuations in gas turbine testing facilities
In a gas turbine engine testing facility, the engine draws air in from the surrounding environment through a large inlet. This process entrains additional flow beyond that which goes through the engine. Downstream of the engine, the engine exhaust and this entrained flow both enter a long cylindrical flow channel during which the two streams partially mix. Further downstream the flow diffuses and impinges on a conical flow redirection device (cone) before exiting into an exhaust stack via a perforated cylinder. This project aims to develop solutions and new insight related to reducing undesired large amplitude, low frequency pressure fluctuations in the exhaust stream of a gas turbine engine testing facility. The analysis will be carried out using high fidelity numerical simulations of unstead fluid flow such as a large eddy simulation. Solutions will be investigated by identifying how best to model the unsteady pressure fluctuations numberically and then determining how changes to the geometry of existing facility components can best reduce the pressure fluctations. Simultaneously, the phsyical mechanisms driving the pressure fluctuations will be firmly established and solutions based on reducing the ultimate source of the unsteadiness will be proposed. Thse may be more substantial than simply changing existing facility component geometry and thus will serve as backup solutions if the fluctuations cannot be adequately reduced via simple component geometry changes.
Short-term prediction of border crossing times for trucks
International borders, where trucks are subject to immigration, customs and security inspection, can impose extreme unpredictability on delivery times. This is a particular problem for trucks serving just-in-time supply chains where goods must arrive within narrow time windows. For example, at automotive assembly plants numerous components must arrive shortly before they are needed on the assembly line – even one component arriving late could stop the line. Providing short-term crossing time predictions can help alleviate this problem. If a truck can be warned of a major delay a few minutes or hours before it gets to the border, it will be possible for supply chain managers to initiate actions such as redirecting the truck to an alternative crossing, dispatching a substitute shipment from a different location, or warning the receiving facility of the delay so that contingency plans can be implemented. Traffic conditions at the border can change rapidly, so trucks need predictions, rather than current reports, of crossing times to help them plan ahead. No such predictions, however, are currently available. In our proposed project, researchers at the University of Windsor will team with mobile application developer Innovex Inc. to develop a smartphone application that will provide accurate predictions of crossing times for trucks over a range of time intervals from 10 minutes to two hours, and deliver notification of likely schedule delay to shippers, dispatchers, drivers, receivers and other supply chain participants.