Innovative low-heat pumps to curb fuel consumption and emissions
Low-heat rejection pumps provide a solution to the increasing fuel temperatures experienced on modern aircraft with advanced cycles. By ensuring that fuel does not overheat, such pumps allow engines to have lighter weight heat management systems in place – ultimately making them more efficient. With this in mind, the EU-funded ADEPT (High efficiency fuel pumping) project set out to design fuel pumps with novel components that minimise the heating of fuel from the engine control system. The concept relies on demonstrating a high-speed, lightweight and large-capacity variable displacement piston pump for medium and large aero engine fuel systems. Prior to the design and manufacture stage, mathematical analysis was carried out on piston pumps and materials testing. This enabled project partners to assess the performance of the pumping components on existing in-service pump designs. Mathematical modelling helped determine the cause of high-speed damage and how to prevent it by evaluating loadings. A new model to design a pump for efficient loadings at high speed was developed, and lubrication modelling led to improved design. The ADEPT team identified the service-life limitations of current pumps by examining overhaul parts through endurance tests. During the course of the project, piston pump design guidelines were created and updated, and a set of validated design rules for the piston pump were developed following analysis. About 825 hours were spent testing new materials in order to identify optimum material combinations in pumps. This helped to finalise the design for a high-duty large engine. ADEPT demonstrated a high-duty pump that supports engine technologies in delivering better efficiency and lower emissions. Outcomes will ultimately contribute to reducing the environmental impact of aviation.
Keywords
High-efficiency fuel pump, aero engine, fuel systems, piston pump, high-duty pump
