Experimental Demonstration of the Concept of Endothermic Fuels for Providing Efficient Cooling to Scramjet Combustors

Srinivas, J and Manjunath, P (2011) Experimental Demonstration of the Concept of Endothermic Fuels for Providing Efficient Cooling to Scramjet Combustors. In: INTERNATIONAL CONFERENCE ON ADAPTIVE TECHNOLOGIES FOR SUSTAINABLE GROWTH, 16 Jun 2011, Namakkal, Tamil Nadu, India.

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    Abstract

    The development of endothermic fuels is important for providing efficient cooling to scramjet combustors operating at high Mach numbers. Generally the fuel itself can be used as coolant for the engine elements. Since preheating the fuel is desirable before combustion, it can be circulated in heat transfer passages em-bedded inside the hot engine parts so that the excess heat of the engine is removed by the fuel and in the process the fuel is also regeneratively preheated to the desired temperature. Endo-thermic fuels pertain to a class of fuels, which make use of certain endothermic reactions to provide an additional heat sink for cooling the engine hot end parts through embedded heat ex-change devices. While traditional fuels use only the sensible heat of the fuels for cooling, endothermic fuels provide cooling through two routes, namely, the absorption of the sensible heat and through the use of endothermic reactions. At the Propulsion Division, NAL, the concept of endothermic cooling has been ex-perimentally demonstrated using kerosene as the fuel and molec-ular sieves as the cracking catalyst. A laboratory scale catalytic reactor was used for carrying out the catalytic reaction. A differ-ence of 114 K was observed for endothermic cooling whereas the conventional method of cooling gave only 18 K. The details of this important experiment are described in this paper

    Item Type: Conference or Workshop Item (Paper)
    Subjects: AERONAUTICS > Aircraft Propulsion and Power
    Division/Department: Propulsion Division, Propulsion Division
    Depositing User: Mr. BS Shivaram
    Date Deposited: 20 Sep 2013 13:55
    Last Modified: 20 Sep 2013 13:55
    URI: http://nal-ir.nal.res.in/id/eprint/11779

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