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Title of Journal: Sci China Technol Sci

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Abbravation: Science China Technological Sciences

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Science China Press

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10.1007/bf02080701

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1869-1900

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Geometric effects of fuel regression rate in hybri

Authors: GuoBiao Cai YuanJun Zhang PengFei Wang Tian Hui Sheng Zhao NanJia Yu
Publish Date: 2016/04/07
Volume: 59, Issue: 5, Pages: 807-813
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Abstract

The geometric configuration of the solid fuel is a key parameter affecting the fuel regression rate in hybrid rocket motors In this paper a semiempirical regression rate model is developed to investigate the geometric effect on the fuel regression rate by incorporating the hydraulic diameter into the classical model The semiempirical model indicates that the fuel regression rate decreases with increasing hydraulic diameter and is proportional to d h 02 when convective heat transfer is dominant Then a numerical model considering turbulence combustion solid fuel pyrolysis and a solid–gas coupling model is established to further investigate the geometric effect Eight motors with different solid fuel grains are simulated and four methods of scaling the regression rate between different solid fuel grains are compared The results indicate that the solid fuel regression rates are approximate the same when the hydraulic diameters are equal The numerical results verify the accuracy of the semiempirical model

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