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International Journal of Energetic Materials and Chemical Propulsion

年間 6 号発行

ISSN 印刷: 2150-766X

ISSN オンライン: 2150-7678

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 0.7 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00016 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.18 SJR: 0.313 SNIP: 0.6 CiteScore™:: 1.6 H-Index: 16

Indexed in

USE OF SOLID OXIDIZER FOR IMPROVING THE STARTING CAPABILITY OF TURBINE ENGINES

巻 8, 発行 5, 2009, pp. 461-471
DOI: 10.1615/IntJEnergeticMaterialsChemProp.v8.i5.70
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要約

Small turbine engines are often optimized to operate within a narrow range of rotational speeds, higher than the speed induced by the starting system. Under harsh ambient conditions, such as reduced pressure and density, the decreased flow rate of air may prevent the combustion process from producing sufficient power to accelerate the engine up to its minimal rotational speed for self-sustained operation (idle speed). Many applications for small turbine engines (APUs, decoys, drones, etc.) require a reliable, one-shot starting system that ensures a successful starting at first attempt, in various ambient conditions. Previous work has shown that adding oxygen into the combustion chamber, during the starting process, improves the range of conditions in which the engine could start successfully. Most solutions utilize high-pressure gaseous oxygen supply systems, that remains on-board the platform throughout the entire flight, even after the starting process is completed. The added oxygen in the combustion chamber facilitates the burning of a larger amount of fuel and improves the combustion efficiency in the chamber, thus increasing the power of the turbine, assisting it to accelerate up to idle speed. The approach presented here (patent pending) aims to facilitate the need for oxygen during the starting process, using a simple, expendable, safely storable and relatively low-cost solution. The main concept is to store and supply the oxygen using a solid oxidizing capsule (SOC), installed inside the combustion chamber. The ignition process initiates the thermal decomposition, or deflagration, of the SOC, causing it to release oxidizing species, thus, augmenting the combustion process. The increased power of the hot products going into the turbine will enable the engine to accelerate up to idle speed. After several seconds, the SOC will be fully decomposed and consumed, leaving no unnecessary mass onboard. This study shows that retrofitting an engine with a SOC can lower its minimal starting conditions (pressure and density) by roughly 30%, using available materials and technology to obtain the required properties and configuration.

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