Performance comparison between subsonic and supersonic needle gas valves
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摘要:
针栓燃气阀是固体姿轨控火箭发动机能量管理的关键部件。针栓燃气阀可以分为亚声速构型和超声速构型,两种阀门分别主要工作在亚声速段和超声速段,其工作特性和应用场合也各不相同。本文采用CFD数值计算方法,分析了多开度下两种阀门构型的流动损失、阀杆负载及热化学烧蚀等,并对比分析了两种结构阀门的优缺点。计算结果表明:两种阀门构型的流动损失都会随着开度的增大而减小,在工作条件相同的情况下超声速燃气阀流动损失更大。不同开度下,超声速阀的负载力更为稳定,并且大开度下超声速阀负载小,与此同时,阀杆结构尺寸对阀门负载具有很大影响。亚声速阀针栓阀杆处的热化学烧蚀率较超声速阀杆高,是超声速的5倍。超声速阀腔喉部处热化学烧蚀高,是亚声速阀的1.5倍。
Abstract:The needle gas valve is a critical component for energy management in solid-propellant attitude and orbit control rocket engines. Needle gas valves can be classified into subsonic and supersonic configurations. These two valve types primarily operate in subsonic and supersonic flow regimes, respectively, and exhibit distinct working characteristics and application scenarios. The CFD numerical simulation method was employed to analyze flow losses, valve stem loads, and thermochemical ablation of both valve configurations under multiple opening levels. A comparative analysis of the advantages and disadvantages between these two structural designs was also conducted. The results indicated that flow losses for both valve configurations decreased with the increasing opening levels. Under identical operating conditions, the supersonic gas valve exhibited higher flow losses compared with the subsonic configuration. At different opening levels, the supersonic valve demonstrated more stable load forces on the valve stem, with significantly lower loads at large openings. Additionally, the structural dimensions of the valve stem exerted a substantial influence on the valve load distribution. The thermochemical ablation rate at the subsonic valve stem was five times higher than that of the supersonic valve stem. Conversely, the ablation rate at the throat of the supersonic valve chamber was 1.5 times greater than that observed in the subsonic valve.
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Key words:
- gas valve /
- flow loss /
- load /
- thermochemical ablation /
- performance comparison
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表 1 亚超声速阀尺寸参数
Table 1. Dimensional parameters of subsonic and supersonic valve configurations
mm 参数 亚声速阀 超声速阀 $ {L}_{\mathrm{a}1} $ 11.9 11.9 $ {L}_{\mathrm{a}2} $ 44.8 44.8 $ {d}_{\mathrm{a}1} $ 9 9 $ {d}_{\mathrm{a}2} $ 9 9 $ {d}_{\mathrm{a}3} $ 4.5 4.9 $ {d}_{\mathrm{a}4} $ 14 14 $ {d}_{\mathrm{a}5} $ 10.8 14.3 $ {d}_{\mathrm{a}6} $ 14 14 表 2 烧蚀反应方程式及其动力参数
Table 2. Ablation reaction equations and associated kinetic parameters
反应类型 A/($ {{\mathrm{m}}}^{2}\cdot {\mathrm{s}}\cdot {{\mathrm{Pa}}}^{0.5}/{\mathrm{kg}} $) $ \beta $ E/$ {10}^{5} $ (J/mol) n $ {{\rm{C}}}_{ ({{\mathrm{s}}}) }+{{\mathrm{H}}}_{2}{\mathrm{O}}\to {\mathrm{CO}}+{{\mathrm{H}}}_{2} $ 1.51×103 0 2.88 0.5 $ {{\mathrm{C}}}_{ ({\mathrm{s}}) }+{{\mathrm{CO}}}_{2}\to 2{\mathrm{CO}} $ 28.27 0 2.88 0.5 表 3 亚声速阀不同开度下各个区域总压损失百分比
Table 3. Total pressure loss percentage in different regions of the subsonic valve configuration at various opening levels
% 开度/mm 亚声速区 亚声速转弯区 喉部区 膨胀区 2 0.00134 0.003 48.39 14.4 3 0.00323 0.046 36.04 6.4 4 0.00450 0.067 20.12 5.5 全开 0.02272 0.072 5.91 4.3 表 4 超声速阀不同开度下各个区域总压损失百分比
Table 4. Total pressure loss percentage in different regions of the supersonic valve configuration at various opening levels
% 开度/mm 亚声速区 喉部区 阀腔区 转弯区 膨胀区 2 0.0149 25.76 67.395 0.99 0.435 3 0.0883 13.12 67.171 1.61 2.000 4 0.1220 9.199 61.508 1.67 3.010 全开 0.1849 2.791 60.054 1.73 3.550 表 5 亚声速阀与超声速阀关键结构尺寸取值
Table 5. Key structural dimensions of subsonic and supersonic valve configurations
mm 尺寸编号 亚声速阀 超声速阀 $ {d}_{{\mathrm{a}}1} $ $ {d}_{{\mathrm{a}}2} $ $ {d}_{{\mathrm{a}}1} $ $ {d}_{{\mathrm{a}}2} $ 1 9 9 9 9 2 9 7 9 7 3 9 5 9 5 4 9 11 9 11 5 9 13 9 13 -
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