火箭推进

基于无水肼ATR发动机,开展了氨解离度对涡轮前燃气及发动机总体性能的影响研究,对不同氨解离度时无水肼ATR发动机性能进行计算对比。结果显示,随着氨解离度x升高,无水肼分解燃气温度降低,H2、N2在分解混合气中的质量百分比升高,燃气比热比、气体常数数值升高; 在地面状态同一转速下,x越小,发动机比冲越高。在100%物理转速时,x=0.29对应的发动机比冲最高且为808 s,无水肼流量为0.999 kg/s,较x=0.8发动机比冲提高最大约7.3%,无水肼流量减小约7.33%; 同一高空条件100%转速下,x越小,发动机比冲越高。在22 km/3.5Ma条件下,x=0.29较x=0.8发动机比冲提高最大约14.6%,无水肼流量减小约8.2%。在同一ATR发动机、同一转速下,氨解离度越低,涡轮等熵功越大,无水肼流量越小,发动机比冲越高。

Based on hydrazine ATR, performance analysis of hydrazine ATR with different dissociated ratios of NH3(x)was presented here.And the calculation and comparison about performance of ATR with different x were carried out.The results show that as x increases, temperature of gas decreases which is dissociated from hydrazine by catalysis, mass percentage of H2, N2 increases, and the value of specify heat ratio and gas constant goes up.On the ground state, the specify impulse of ATR increases as x decreases under the same rev.When the physical rev is 100% and x=0.29, the specify impulse reaches top 808s, which is 7.3% higher than that at x=0.8, and the mass flow rate of hydrazine is 0.999 kg/s, which is 7.33% lower than that at x=0.8.Under the condition of high altitude, the specify impulse of ATR increases as x decreases under the same rev.The specify impulse and mass flow rate, with x of 0.29, are 14.6% and 8.2% higher than that at x =0.8 when the flight condition is 22 km/3.5Ma respectively.With the same ATR engine and rev, as the dissociated ratio of NH3 decreases, isentropic work of turbine increases, mass flow rate of hydrazine decreases and specify impulse of ATR increases.

引言
1 无水肼ATR发动机
2 氨解离度的影响
3 结论

图1 无水肼ATR发动机结构布局示意图<br/>Fig.1 Structure sketch of hydrazine ATR

图1 无水肼ATR发动机结构布局示意图
Fig.1 Structure sketch of hydrazine ATR

图2 无水肼分解燃气物性随氨解离度变化结果<br/>Fig.2 Parameters of dissociated gas with different dissociated ratios of NH3

图2 无水肼分解燃气物性随氨解离度变化结果
Fig.2 Parameters of dissociated gas with different dissociated ratios of NH3

表1 无水肼ATR发动机设计点参数(部分)<br/>Tab.1 Part parameters of for ATR at design point

表1 无水肼ATR发动机设计点参数(部分)
Tab.1 Part parameters of for ATR at design point

图3 地面状态不同转速时氨解离度变化影响<br/>Fig.3 Performance of ATR on ground state with different revs and dissociated ratios of NH3

图3 地面状态不同转速时氨解离度变化影响
Fig.3 Performance of ATR on ground state with different revs and dissociated ratios of NH3

图4 不同高空状态下氨解离度变化影响<br/>Fig.4 Performance of ATR at high altitude with different revs and dissociated ratios of NH3

图4 不同高空状态下氨解离度变化影响
Fig.4 Performance of ATR at high altitude with different revs and dissociated ratios of NH3

图5 不同氨解离度时涡轮参数变化结果<br/>Fig.5 Parameters of turbine with different dissociated ratios of NH3

图5 不同氨解离度时涡轮参数变化结果
Fig.5 Parameters of turbine with different dissociated ratios of NH3

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备注

引言

1 无水肼ATR发动机

2 氨解离度的影响

3 结论

期刊信息