Solar Bimodal System with Hydrogen Post-Burning. The Porblems of Combustion Chamber Heat Shield

Details Solar Bimodal System with Hydrogen Post-Burning. The Porblems of Combustion Chamber Heat Shield Solar Bimodal System with Hydrogen Post-Burning. The Porblems of Combustion Chamber Heat Shield

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.829c&link_type=abstract

IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,

Computer Science

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Scientific paper

The space solar bimodal system (SBS) with the high-temperature heating of hydrogen in the concentrator-absorber system and the heated hydrogen post-burning with oxygen in the combustion chamber is considered. The SBS can provide the interorbital transfers at operation in the propulsion mode, and the power supply at operation in the energy mode. The SBS operation in the propulsion mode permits to increase the delivered (from LEO to GEO) payload mass in 1.5-2 times in comparison with the prospective LH2-LOX liquid rocket engines, or to use the carrier-rocket of more light class with less cost of launch. The SBS operation in the onboard equipment power supply mode can provide the high specific power - 5 kWe per ton or more. The reliability of such SBS prolonged operation is rather high due to usage of the high-effective multi-stage concentrator- absorber system which prevents the SBS optical efficiency decreasing occurring because of the concentrator accuracy reduction at space operation conditions (periodical temperature changing, UV-radiation influence, etc.) One of the principle problems of creation of SBS, as a system of low thrust, is the complexity of cooling of the combustion chamber where the heated hydrogen is post-burned. In the carried-out investigation the possible solution of this problem is considered. The usage of heat shield system including coolant loop with the liquid metal and the tank with thermal accumulating substance is suggested. The results of corresponding investigations concerning the performances of the SBS cooling and specific impulse change are presented. It is shown that specific impulse of the presented SBS can slightly reduce or even increase in some important cases in comparison with the existing solar bimodal systems. In the energy mode the concentrator-absorber assembly provides the high- temperature elements heating in the electric power supply system. The combination of the number of propulsion system thrust and working process parameters in some cases can be of interest of practical realisation of the thermal protection considered method.

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