Mathematical Model of a Constructal Coanda Effect Nozzle


1 Faculty of Arts, Computing, Engineering and Sciences - Sheffield Hallam University, City Campus, Howard Street, Sheffield S1 1WB, UK

2 Graphic Era University, 566/6 Bell Road, Clement Town, Dehradun-248002, India

3 Di.S.M.I. - Università di Modena e Reggio Emilia - Pad. Morselli, Via Amendola, 2 Reggio Emilia, RE, 42122, Italy


This paper analyses the ACHEON Coanda effect nozzle for aircraft propulsion, based on the dynamic equilibrium of two jet streams. The ACHEON concept, and, in particular, the HOMER nozzle, which is its main component, are presented, together with the literature milestones from which the idea originally stems. A sub-system analysis inspired by the principles of Constructal Theory is presented for the current architecture. A mathematical model of a 2D case of the system is developed, focusing on the combined effect of the mixing of the two streams and the Coanda adhesion over a convex surface. A validation of the model is also reported, based on 2D CFD analyses, under the hypothesis of incompressible flow. Results highlight that, in spite of its relative simplicity, the model produces accurate results.