含石蜡燃料的能量特性和退移速率测试

Energy Characteristics and Regression Rate Measurement of Paraffin-based Fuel

含石蜡燃料是固液混合火箭发动机的理想能源,采用最小自由能法在富氧、富燃和最佳氧燃比条件下对组分含量不同的含石蜡燃料和端羟基聚丁二烯（HTPB）燃料进行能量特性计算,利用固气矩形混合发动机测试含石蜡燃料和HTPB燃料的退移速率.能量特性计算结果表明：在相同组分配方下,加入AP使燃料中含氧量增多、最佳氧燃比和比冲降低,加入Al能提高燃烧室温度和密度比冲;在相同氧燃比下,含石蜡燃料和HTPB燃料的比冲基本相同.退移速率实验结果表明：在氧气质量流率从25 g·s^-1增加到40g·s^-1时,石蜡燃料的退移速率从0.79 mm·s^-1增加到1.11 mm·s^-1,HTPB燃料的退移速率从0.47 mm·s^-1增加到0.68 mm·s^-1;石蜡燃料的退移速率约为普通HTPB燃料的1.58 ～1.74倍.

The paraffin-based fuel is an ideal power for the solid-liquid hybrid-engine. The energy characteristics of paraffin-based fuel and HTPB fuel were calculated by minimum free energy method under more oxidizer, more fuel, and the optimal oxygen-fuel ratio working conditions. The regression rate of paraffin-based fuel and HTPB fuel were tested by rectangle solid-gas hybrid engine. The energy characteristics results show that： the fuel＇s oxygen contents are increased by adding AP, but the optimal oxygen-fuel ratio and specific impulse are both reduced. The chamber temperature and density specific impulse are improved by adding AI, and the specific impulse of paraffin-based fuel and HTPB fuel are basically similar. The regression rate results show that： with the increasing oxidizer mass flow rate from 25 g·s^-1 to 40 g·s^-1, the regression rate of paraffin-based fuel is improved from 0.79 mm·s^-1 to 1. 11 mm·s^-1, the regression rate of HTPB fuel is improved from 0.47 mm·s^-1 to 0.68 mm·s^-1; the regression rate of paraffin-based fuel is higher than that of the common HTPB fuel about 1.58-1.74 times.