Departamento de Ciências Aeroespaciais

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Supercharging of a 4-stroke Junkers engine
Publication . Abreu, José Ricardo Gomes; Brojo, Francisco Miguel Ribeiro Proença
In the field of aviation, supercharging allows piston engines to develop maximum power when operating at high altitudes or boost an aircraft’s power during take-off. A naturally aspirated engine, without a supercharger, will lose power at high altitudes because of the reduced density of the air entering the intake system. This project aims to supercharge an opposed piston engine (OPE) developed by Jorge Gregório using the RHB31 VZ21 turbocharger to improve its performance. The UBI/UDI – OPE-BGX286 is a single cylinder 4-stroke spark ignition OPE with a twin crankshaft configuration similar to the Junkers Jumo 205 operating in a horizontal position. A new exhaust system and an intake system containing an air capacitor were designed and fabricated to allow the supercharging of the engine. An Eddy current dynamometer and various sensors connected to the engine control unit were utilised to measure the engine parameters during the natural aspiration and supercharging tests. The engine performance was quantified by the values of torque, power and specific fuel consumption. Several problems were found throughout the tests that made it impossible for the engine to function correctly and the modifications made to rectify them are explained. Possible reasons for the failure of the study are then presented.
2023-11-24Master thesis Open access Show more