The aim of this research is to present a preliminary experimental investigation on the behavior of lithium-aluminum complex hydrides when exposedtogaseous nitrogen in the range of 20-350°C for airbreathing propulsion applications. This specific task is part of the long-term project devoted to the use of lithium-aluminum hydrides in airbreathing propulsion applications.Itisknown that a launch system based on the airbreathing technology, byusing air as oxidizer, reduces the cost per kilogramof the launch;itistherefore much more profitable than common rocket engines (solid and liquid rockets). The effect of nitrogen gas on the thermal behavior and the kinetic parameters of lithium-aluminum hydride and trilithium-aluminum hydride has been investigated. Differential scanning calorimeter tests, performed using nitrogen gas, have shown the presence ofa strong exothermic peak that, when using heliumorargon gas,isbarely noticeable. A nitridation reaction has been suggested to explain the increase of the sample mass after each differential scanning calorimeter test, which supports the experimental data. The activation energy Ea and frequency factor A for the samples of lithium-aluminum hydride and trilithium-aluminum hydride have been calculated using two simplified kinetic methods: the Ozawa method and the Kissinger method.

Preliminary kinetic characterization of lithium-aluminum based hydrides for airbreathing propulsion

Boiocchi, Matteo;Galfetti, Luciano;Di Landro, Luca
2018

Abstract

The aim of this research is to present a preliminary experimental investigation on the behavior of lithium-aluminum complex hydrides when exposedtogaseous nitrogen in the range of 20-350°C for airbreathing propulsion applications. This specific task is part of the long-term project devoted to the use of lithium-aluminum hydrides in airbreathing propulsion applications.Itisknown that a launch system based on the airbreathing technology, byusing air as oxidizer, reduces the cost per kilogramof the launch;itistherefore much more profitable than common rocket engines (solid and liquid rockets). The effect of nitrogen gas on the thermal behavior and the kinetic parameters of lithium-aluminum hydride and trilithium-aluminum hydride has been investigated. Differential scanning calorimeter tests, performed using nitrogen gas, have shown the presence ofa strong exothermic peak that, when using heliumorargon gas,isbarely noticeable. A nitridation reaction has been suggested to explain the increase of the sample mass after each differential scanning calorimeter test, which supports the experimental data. The activation energy Ea and frequency factor A for the samples of lithium-aluminum hydride and trilithium-aluminum hydride have been calculated using two simplified kinetic methods: the Ozawa method and the Kissinger method.
JOURNAL OF PROPULSION AND POWER
Aerospace Engineering; Fuel Technology; Mechanical Engineering; Space and Planetary Science
File in questo prodotto:
File Dimensione Formato  
BOIOM01-18.pdf

Accesso riservato

Descrizione: Paper
: Publisher’s version
Dimensione 1.03 MB
Formato Adobe PDF
1.03 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
BOIOM_OA_01-18.pdf

embargo fino al 01/02/2018

Descrizione: Paper open access
: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 942.83 kB
Formato Adobe PDF
942.83 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/1043948
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact