Electrically heated composite leading edges for aircraft anti-icing applications

De Rosa, Francesco (2010) Electrically heated composite leading edges for aircraft anti-icing applications. [Tesi di dottorato] (Inedito)

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Abstract

An investigation was conducted in the Aerospace Engineering Department (DIAS) at Federico II University of Naples aiming to evaluate the feasibility and the performance of an electrically heated composite leading edge for anti-icing and de-icing applications. A 283 [mm] chord NACA0012 airfoil prototype was designed, manufactured and equipped with an High Temperature composite leading edge with embedded Ni-Cr heating element. The heating element was fed by a DC power supply unit and the average power densities supplied to the leading edge were ranging 1.0 to 30.0 [kW m-2]. The present investigation focused on thermal tests experimentally performed under fixed icing conditions with zero AOA, Mach=0.2, total temperature of -20 [°C], liquid water content LWC=0.6 [g m-3] and average mean volume droplet diameter MVD=35 [µm]. These fixed conditions represented the top icing performance of the Icing Flow Facility (IFF) available at DIAS and therefore it has represented the “sizing design case” for the tested prototype. An analytical model has been also developed both for the preliminary sizing and test guidance. Running wet and fully evaporative functional modes have been verified both analytically and experimentally with reasonable agreement. A room temperature thermal endurance test has been run for 104 cycles with max thermal load representative of 1.5 times the max temperature experienced within the leading edge in fully evaporative conditions aiming to verify the integrity of the composite laminate after the imposed thermal stress through micrographic inspection. The achieved results, despite obtained under limited icing conditions imposed by the IFF wind tunnel, showed great potentialities for the proposed Icing Protection System named EHCLE (Electrical Heated Composite Leading Edge) which has been constantly working below 60% of its maximum operative temperatures under the given icing conditions and the explored power densities. This potentiality justify the need for future development in a larger scale under more severe icing condition for a final assessment about the applicability of such Icing Protection System to real aircrafts.

Tipologia di documento:Tesi di dottorato
Parole chiave:anti-icing; de-icing; Composite; EHCLE; IPS
Settori scientifico-disciplinari MIUR:Area 09 Ingegneria industriale e dell'informazione > ING-IND/06 FLUIDODINAMICA
Area 09 Ingegneria industriale e dell'informazione > ING-IND/05 IMPIANTI E SISTEMI AEROSPAZIALI
Coordinatori della Scuola di dottorato:
Coordinatore del Corso di dottoratoe-mail (se nota)
Moccia, Antonioantonio.moccia@unina.it
Tutor della Scuola di dottorato:
Tutor del Corso di dottoratoe-mail (se nota)
Russo, Giuseppe Pompeogprusso@unina.it
Stato del full text:Accessibile
Data:30 Novembre 2010
Numero di pagine:159
Istituzione:Università degli studi di Napoli Federico II
Dipartimento o Struttura:Ingegneria aerospaziale
Tipo di tesi:Dottorato
Stato dell'Eprint:Inedito
Scuola di dottorato:Ingegneria industriale
Denominazione del dottorato:Ingegneria aerospaziale, navale e della qualità
Ciclo di dottorato:23
Numero di sistema:8354
Depositato il:02 Dicembre 2010 22:49
Ultima modifica:01 Aprile 2014 13:19

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