Experimental study on radiometric density measurements of petroleum-based and coal-based rocket kerosene at high-parameters
Based on the Beer-Lambert law,the densities of rocket kerosene were measured by a γ-ray absorption method under liquid-state or supercritical pressure conditions.The measurement temperature ranged from 293 K to 673 K and the measured pressure from 0.3 MPa to 30 MPa.The extended relative uncertainties of the measured densities were identified as 2.2％-3.2％(coverage factor k=2).The cyclohexane at normal pressure and temperature of 293 K was selected as the high-density standard fluid,and the cyclohexane at the pressure of 5 MPa and the temperature of 673 K was selected as the low-density standard fluid to offset the impact of temperature changes on the radiation absorption rate of the measuring device.The reliability and accuracy of the measurement method was verified by calibrating the density measurements of cyclohexane and toluene.On this basis,density measurements of petroleum-based and coal-based rocket kerosene were performed and the isobaric coefficients of thermal expansion of petroleum-based and coal-based rocket kerosene were calculated.The experimental data were used to fit the Tait functional equation for the density of the two types of rocket kerosene over a wide range of temperature and pressure,and the average absolute deviation of the experimental density data from the equation was 0.21％,with a maximum absolute deviation of 1.32％.The results show that the densities of coal-based kerosene are basically identical with the petroleum-based kerosene at the measured conditions,the densities of high-energy kerosene are slightly higher than those of petroleum-based kerosene at low temperatures and lower than those of petroleum-based kerosene at high temperatures.The experimental density measurements in this paper provide fundamental data for the study of high-parameter rocket kerosene physical properties and heat transfer.
万方数据
维普
