Asymmetric Double-Entry Turbine (ADET)

The Asymmetric Double-Entry Turbine allows the tuning between turbine scrolls under high Exhaust Gas Recirculation rates, allowing the maximisation of efficiency and power extraction.

Technology

Exhaust Gas Recirculation (EGR) is an effective post-combustion measure to reduce the formation of NOx within Internal Combustion engines. In double-entry turbochargers, high EGR rates lead to a mass imbalance between the turbine scrolls and a resultant degradation of aerodynamic performance. ADT therefore proposes a scroll design with asymmetry between runners, allowing an improved flow balance around the turbine wheel and leading to improved energy extraction capability.

ADETExperimental testing at Imperial College achieved 75% peak efficiency at 10% EGR rate. In comparison to a symmetric turbine, a nozzled design increased average turbine efficiency by 13%-points in unsteady testing, leading to a predicted Brake Specific Fuel Consumption improvement of 2-3%.

Markets

The Asymmetric Double-Entry Turbine is well-suited to heavy-duty engines (gasoline and diesel, on- and off-road) utilising Exhaust Gas Recirculation.

Management

The development of this technology is currently being supported by the Industry Partnerships and Commercialisation Engineering team at Imperial College London. A business development manager has been engaged to attract and negotiate with potential licensees for the technology.

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